Database — database()

Code author: Lori A. Burns

Section author: Lori A. Burns

psi4.driver.wrapper_database.database(name, db_name[, func, mode, cp, rlxd, symm, zpe, benchmark, tabulate, subset])[source]

Function to access the molecule objects and reference energies of popular chemical databases.

Aliases:db()
Returns:(float) Mean absolute deviation of the database in kcal/mol
PSI variables:

Note

It is very easy to make a database from a collection of xyz files using the script psi4/share/scripts/ixyz2database.py. See Creating a Database for details.

Caution

Some features are not yet implemented. Buy a developer some coffee.

  • In sow/reap mode, use only global options (e.g., the local option set by set scf scf_type df will not be respected).

Note

To access a database that is not embedded in a PSI4 distribution, add the path to the directory containing the database to the environment variable PYTHONPATH.

Parameters:
  • name (string) –

    'scf' || 'sapt0' || 'ccsd(t)' || etc.

    First argument, usually unlabeled. Indicates the computational method to be applied to the database. May be any valid argument to energy().

  • db_name (string) –

    'BASIC' || 'S22' || 'HTBH' || etc.

    Second argument, usually unlabeled. Indicates the requested database name, matching (case insensitive) the name of a python file in psi4/share/databases or PYTHONPATH. Consult that directory for available databases and literature citations.

  • func (function) –

    \(\Rightarrow\) energy \(\Leftarrow\) || optimize || cbs

    Indicates the type of calculation to be performed on each database member. The default performs a single-point energy('name'), while optimize perfoms a geometry optimization on each reagent, and cbs performs a compound single-point energy. If a nested series of python functions is intended (see Function Intercalls), use keyword db_func instead of func.

  • mode (string) –

    \(\Rightarrow\) 'continuous' \(\Leftarrow\) || 'sow' || 'reap'

    Indicates whether the calculations required to complete the database are to be run in one file ('continuous') or are to be farmed out in an embarrassingly parallel fashion ('sow'/'reap'). For the latter, run an initial job with 'sow' and follow instructions in its output file.

  • cp (boolean) –

    'on' || \(\Rightarrow\) 'off' \(\Leftarrow\)

    Indicates whether counterpoise correction is employed in computing interaction energies. Use this option and NOT the cp() function for BSSE correction in database(). Option available (See Available Databases) only for databases of bimolecular complexes.

  • rlxd (boolean) –

    'on' || \(\Rightarrow\) 'off' \(\Leftarrow\)

    Indicates whether correction for deformation energy is employed in computing interaction energies. Option available (See Available Databases) only for databases of bimolecular complexes with non-frozen monomers, e.g., HBC6.

  • symm (boolean) –

    \(\Rightarrow\) 'on' \(\Leftarrow\) || 'off'

    Indicates whether the native symmetry of the database reagents is employed ('on') or whether it is forced to \(C_1\) symmetry ('off'). Some computational methods (e.g., SAPT) require no symmetry, and this will be set by database().

  • zpe (boolean) –

    'on' || \(\Rightarrow\) 'off' \(\Leftarrow\)

    Indicates whether zero-point-energy corrections are appended to single-point energy values. Option valid only for certain thermochemical databases. Disabled until Hessians ready.

  • benchmark (string) –

    \(\Rightarrow\) 'default' \(\Leftarrow\) || 'S22A' || etc.

    Indicates whether a non-default set of reference energies, if available (See Available Databases), are employed for the calculation of error statistics.

  • tabulate (array of strings) –

    \(\Rightarrow\) [] \(\Leftarrow\) || ['scf total energy', 'natom'] || etc.

    Indicates whether to form tables of variables other than the primary requested energy. Available for any PSI variable.

  • subset (string or array of strings) –

    Indicates a subset of the full database to run. This is a very flexible option and can be used in three distinct ways, outlined below. Note that two take a string and the last takes an array. See Available Databases for available values.

    • 'small' || 'large' || 'equilibrium'
      Calls predefined subsets of the requested database, either 'small', a few of the smallest database members, 'large', the largest of the database members, or 'equilibrium', the equilibrium geometries for a database composed of dissociation curves.
    • 'BzBz_S' || 'FaOOFaON' || 'ArNe' || 'HB' || etc.
      For databases composed of dissociation curves, or otherwise divided into subsets, individual curves and subsets can be called by name. Consult the database python files for available molecular systems (case insensitive).
    • [1,2,5] || ['1','2','5'] || ['BzMe-3.5', 'MeMe-5.0'] || etc.
      Specify a list of database members to run. Consult the database python files for available molecular systems. This is the only portion of database input that is case sensitive; choices for this keyword must match the database python file.
Examples: 
>>> # [1] Two-stage SCF calculation on short, equilibrium, and long helium dimer
>>> db('scf','RGC10',cast_up='sto-3g',subset=['HeHe-0.85','HeHe-1.0','HeHe-1.5'], tabulate=['scf total energy','natom'])

>>> # [2] Counterpoise-corrected interaction energies for three complexes in S22
>>> #     Error statistics computed wrt an old benchmark, S22A
>>> database('mp2','S22',cp=1,subset=[16,17,8],benchmark='S22A')

>>> # [3] SAPT0 on the neon dimer dissociation curve
>>> db('sapt0',subset='NeNe',cp=0,symm=0,db_name='RGC10')

>>> # [4] Optimize system 1 in database S22, producing tables of scf and mp2 energy
>>> db('mp2','S22',db_func=optimize,subset=[1], tabulate=['mp2 total energy','current energy'])

>>> # [5] CCSD on the smallest systems of HTBH, a hydrogen-transfer database
>>> database('ccsd','HTBH',subset='small', tabulate=['ccsd total energy', 'mp2 total energy'])

Output

At the beginning of a database job is printed a listing of the individual system calculations which will be performed. The output snippet below is from the example job [1] above. It shows each reagent required for the subset of database reactions requested. Note that this is an un-counterpoise-corrected example, and the wrapper is smart enough to compute only once the monomer whose energy will be subtracted from each of the three dimers.

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RGC1-HeHe-0.85-dimer
RGC1-He-mono-unCP
RGC1-HeHe-1.0-dimer
RGC1-HeHe-1.5-dimer

At the end of the job, the Requested Energy table is printed that gives the total energies for the requested model chemistry for each reagent and each reaction, as well as the stoichiometric weights by which the reagent energies are transformed into the reaction energy. In this case, the dimer is +1 and the monomer is -2, indicating the interaction energy is computed from dimer less first monomer less second (identical) monomer. Error statistics are computed with respect to the reference energies stored in the database. One of these, the mean absolute deviation, is returned by the wrapper as an ordinary Python variable. (For databases without a stored reference energy, e.g., BASIC, large and meaningless numbers are printed for error.) The other two tables tabulate the PSI variables requested through keyword tabulate, in this case the total SCF energy and the number of atoms in each reagent.

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==> Mp2 Total Energy <==

------------------------------------------------------------------------------------------------------
            Reaction          Reaction Value                             Reagent 1           Reagent 2
                                                                          Value Wt            Value Wt
------------------------------------------------------------------------------------------------------
      RGC1-HeHe-0.85              0.00004802                        -5.69430495  1      -2.84717649 -2
       RGC1-HeHe-1.0             -0.00000064                        -5.69435362  1      -2.84717649 -2
------------------------------------------------------------------------------------------------------

==> Requested Energy <==

------------------------------------------------------------------------------------------------------
            Reaction     Reaction Energy        Reaction Error           Reagent 1           Reagent 2
                            Ref     Calc [kcal/mol]   [kJ/mol]             [Eh] Wt             [Eh] Wt
------------------------------------------------------------------------------------------------------
      RGC1-HeHe-0.85     0.0376   0.0301    -0.0075    -0.0312      -5.69430495  1      -2.84717649 -2
       RGC1-HeHe-1.0    -0.0219  -0.0004     0.0215     0.0899      -5.69435362  1      -2.84717649 -2
------------------------------------------------------------------------------------------------------
         Minimal Dev                        -0.0075    -0.0312
         Maximal Dev                         0.0215     0.0899
     Mean Signed Dev                         0.0070     0.0293
   Mean Absolute Dev                         0.0145     0.0605
             RMS Dev                         0.0161     0.0673
------------------------------------------------------------------------------------------------------

As well as being printed in the output file, database results from the tabulate option are available in the input file as ordinary Python dictionaries DB_RGT and DB_RXN, indexed firstly by reagent or reaction name and secondly by the requested PSI variable name. See the first paragraph of Creating a Database for the distinction between reagents and reactions. For example, an input file like the following requests a couple variables through tabulate and then makes use of the resulting data structures, here, only to print.

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set basis 6-31g*
db('mp2','s22',subset='small',tabulate=['CURRENT ENERGY','MP2 CORRELATION ENERGY'])

from pprint import pprint

print_stdout('\nDB_RGT')
pprint(DB_RGT)

print_stdout('\nDB_RXN')
pprint(DB_RXN)

print_stdout('\nmp2 interaction energy of water dimer (S22-2)')
print_stdout(DB_RXN['S22-2']['CURRENT ENERGY'])

The output to the screen is as follows.

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DB_RGT
{'S22-16-dimer': {'CURRENT ENERGY': -155.37373581838636,
                  'DF-MP2 CORRELATION ENERGY': -0.523870772178089},
 'S22-16-monoA-unCP': {'CURRENT ENERGY': -78.29412053242164,
                       'DF-MP2 CORRELATION ENERGY': -0.2629759351596186},
 'S22-16-monoB-unCP': {'CURRENT ENERGY': -77.07606823017188,
                       'DF-MP2 CORRELATION ENERGY': -0.2594122526144091},
 'S22-2-dimer': {'CURRENT ENERGY': -152.40958884746667,
                 'DF-MP2 CORRELATION ENERGY': -0.3797598812113561},
 'S22-2-monoA-unCP': {'CURRENT ENERGY': -76.19905879745446,
                      'DF-MP2 CORRELATION ENERGY': -0.1887118848315123},
 'S22-2-monoB-unCP': {'CURRENT ENERGY': -76.19902978067739,
                      'DF-MP2 CORRELATION ENERGY': -0.18857384937354635},
 'S22-8-dimer': {'CURRENT ENERGY': -80.67416758080654,
                 'DF-MP2 CORRELATION ENERGY': -0.2844102558783027},
 'S22-8-monoA-unCP': {'CURRENT ENERGY': -40.336952636980364,
                      'DF-MP2 CORRELATION ENERGY': -0.14185962536715307},
 'S22-8-monoB-unCP': {'CURRENT ENERGY': -40.336952636980506,
                      'DF-MP2 CORRELATION ENERGY': -0.14185962536715097}}

DB_RXN
{'S22-16': {'CURRENT ENERGY': -0.0035470557928363178,
            'DF-MP2 CORRELATION ENERGY': -0.0014825844040612934},
 'S22-2': {'CURRENT ENERGY': -0.011500269334817403,
           'DF-MP2 CORRELATION ENERGY': -0.0024741470062974724},
 'S22-8': {'CURRENT ENERGY': -0.0002623068456699684,
           'DF-MP2 CORRELATION ENERGY': -0.0006910051439986686}}

mp2 interaction energy of water dimer (S22-2)
-0.0115002693348

Available Databases

Below are documented for particular databases the availability of the generic database function options cp, rlxd, benchmark, and the string options for subset. The full reagent member list, which can also be used in conjunction with subset, is not included here for consideration of space and may be found in the database file. The database Python files are very readable and should be consulted for more particular questions.

BBI

Database (Merz) of protein backbone-backbone interactions.
Geometries from Kenneth Merz Group, Univ. of Florida.
Reference interaction energies from Sherrill group, Georgia Tech.
Part of the BioFragment Database (BFDb).
  • cp 'off' || 'on'
  • rlxd 'off'

BAKERJCC96

Geometries from Baker and Chan J. Comput. Chem. 17 888 (1996),
as reported in Bakken and Helgaker, J. Chem. Phys. 117, 9160 (2002).
No reference energies defined.
  • cp 'off'
  • rlxd 'off'

S22

Database (Hobza) of interaction energies for bimolecular complexes.
Geometries from Jurecka et al. PCCP 8 1985 (2006).
First revision to interaction energies (S22A) from Takatani et al. JCP 132 144104 (2010).
Second revision to interaction energies (S22B) from Marshall et al. JCP 135 194102 (2011).
  • cp 'off' || 'on'
  • rlxd 'off'
  • benchmark
    • 'S220' Jurecka et al. PCCP 8 1985 (2006).
    • 'S22A' Takatani et al. JCP 132 144104 (2010).
    • \(\Rightarrow\) 'S22B' \(\Leftarrow\) Marshall et al. JCP 135 194102 (2011).
  • subset
    • 'small' water dimer, methane dimer, ethene-ethine
    • 'large' adenine-thymine
    • 'HB' hydrogen-bonded systems
    • 'MX' mixed-influence systems
    • 'DD' dispersion-dominated systems
    • 'S11' smaller systems in S22
    • 'WATER' water dimer

CORE

Database of Pulay corannulene structures. Subsumed into CFLOW.
  • cp 'off' || 'on'
  • rlxd 'off'

S22by5

Database (Hobza) of interaction energies for dissociation curves of bimolecular complexes.
Geometries and reference interaction energies from Grafova et al. JCTC 6 2365 (2010).
Note that the S22by5-N-1.0 members are essentially the same geometries as S22-N (there’s trivial round-off error) but the reference interaction energies for S22by5 are of lower quality than those of S22.
  • cp 'off' || 'on'
  • rlxd 'off'
  • subset
    • 'small'
    • 'large'
    • 'equilibrium'
    • 'mol1' five-point (0.9, 1.0, 1.2, 1.5, 2.0) \(\times R_{eq}\) dissociation curve for molecule 1
    • …
    • 'mol22' five-point (0.9, 1.0, 1.2, 1.5, 2.0) \(\times R_{eq}\) dissociation curve for molecule 22

A24

Database (Hobza) of interaction energies for bimolecular complexes.
Geometries from <Reference>.
Reference interaction energies from Rezac and Hobza, JCTC (in press).
  • cp 'off' <erase this comment and after unless on is a valid option> || 'on'
  • rlxd 'off' <erase this comment and after unless on is valid option> || 'on'
  • benchmark
    • '<benchmark_name>' <Reference>.
    • \(\Rightarrow\) '<default_benchmark_name>' \(\Leftarrow\) <Reference>.
  • subset
    • 'small' <members_description>
    • 'large' <members_description>
    • '<subset>' <members_description>

S66

Database (Hobza) of interaction energies for bimolecular complexes.
Geometries and reference energies from Rezac et al. JCTC 7 2427 (2011).
  • cp 'off' || 'on'
  • rlxd 'off'
  • subset
    • 'small'
    • 'large'
    • 'HB' hydrogen-bonded systems
    • 'MX' mixed-influence systems
    • 'DD' dispersion-dominated systems

HTR40

Database of Hydrogen transfer reactions.
Geometries from Bozkaya and Sherrill.
Reference energies from Bozkaya and Sherrill.
  • benchmark
    • '<benchmark_name>' <Reference>.
    • \(\Rightarrow\) '<default_benchmark_name>' \(\Leftarrow\) <Reference>.
  • subset
    • 'small' <members_description>
    • 'large' <members_description>
    • '<subset>' <members_description>

NHTBH

Database (Truhlar) of non-hydrogen-transfer barrier height reactions.
Geometries and Reaction energies from Truhlar and coworkers at site http://t1.chem.umn.edu/misc/database_group/database_therm_bh/non_H.htm.
  • cp 'off'
  • rlxd 'off'
  • subset
    • 'small'
    • 'large'

NBC10

Database (Sherrill) of interaction energies for dissociation curves of dispersion-bound bimolecular complexes.
Geometries and Reference interaction energies from the following articles:
Benzene Dimers from Sherrill et al. JPCA 113 10146 (2009).
Benzene-Hydrogen Sulfide from Sherrill et al. JPCA 113 10146 (2009).
Benzene-Methane from Sherrill et al. JPCA 113 10146 (2009).
Methane Dimer from Takatani et al. PCCP 9 6106 (2007).
Pyridine Dimers from Hohenstein et al. JPCA 113 878 (2009).
Collection into NBC10 from Burns et al. JCP 134 084107 (2011).
Revised reference interaction energies (NBC10A) from Marshall et al. JCP 135 194102 (2011).
  • cp 'off' || 'on'
  • rlxd 'off'
  • benchmark
    • 'NBC100' Burns et al. JCP 134 084107 (2011).
    • \(\Rightarrow\) 'NBC10A' \(\Leftarrow\) Marshall et al. JCP 135 194102 (2011).
  • subset
    • 'small'
    • 'large'
    • 'equilibrium'
    • 'BzBz_S' dissociation curve for benzene dimer, sandwich
    • 'BzBz_T' dissociation curve for benzene dimer, t-shaped
    • 'BzBz_PD34' dissociation curve for benzene dimer, parallel displaced by 3.4A
    • 'BzH2S' dissociation curve for benzene-H2S
    • 'BzMe' dissociation curve for benzene-methane
    • 'MeMe' dissociation curve for methane dimer
    • 'PyPy_S2' dissociation curve for pyridine dimer, sandwich
    • 'PyPy_T3' dissociation curve for pyridine dimer, t-shaped
    • 'BzBz_PD32' dissociation curve for benzene dimer, parallel displaced by 3.2A
    • 'BzBz_PD36' dissociation curve for benzene dimer, parallel displaced by 3.6A

JSCH

Database (Hobza) of interaction energies for nucelobase pairs.
Geometries and reference interaction energies from Jurecka et al. PCCP 8 1985 (2006).
Corrections implemented from footnote 92 of Burns et al., JCP 134 084107 (2011).
  • cp 'off' || 'on'
  • rlxd 'off'
  • subset
    • 'small'
    • 'large'
    • 'HB' hydrogen-bonded systems (coplanar base-pairs)
    • 'MX' interstrand systems (adjacent base-pairs on different strands)
    • 'DD' stacked systems (adjacent base-pairs on same strand)

BENCH12

Database of <description of members and reference energy type>.
Geometries from <Reference>.
Reference interaction energies from <Reference>.
  • benchmark
    • '<benchmark_name>' <Reference>.
    • \(\Rightarrow\) '<default_benchmark_name>' \(\Leftarrow\) <Reference>.
  • subset
    • 'small'
    • 'large'
    • 'alkenes'
    • 'alkanes'
    • 'acenes'
    • 'thiophenes'
    • 'h2o_size'
    • 'h2o_shape'
    • 'atoms'
    • 'S22_HB'
    • 'S22_MX'
    • 'S22_DD'

HTBH

Database (Truhlar) of hydrogen-transfer barrier height reactions.
Geometries from Truhlar and coworkers at site http://t1.chem.umn.edu/misc/database_group/database_therm_bh/raw_geom.cgi .
Reference energies from Zhao et al. JPCA, 109 2012-2018 (2005) doi: 10.1021/jp045141s [in supporting information].
  • cp 'off'
  • rlxd 'off'
  • subset
    • 'small'
    • 'large'

RSE42

Database of radical stabilization energies.
Geometries from [E. Soydas and U. Bozkaya, JCTC, 9, 1452-1460 (2013)].
Reference radical stabilization energies from [E. Soydas and U. Bozkaya, JCTC, 9, 1452-1460 (2013)] at CCSD(T)/cc-pCVTZ level.
  • benchmark
    • 'RSE42' [E. Soydas and U. Bozkaya, JCTC, 9, 1452-1460 (2013)].
    • \(\Rightarrow\) 'RSE42' \(\Leftarrow\) [E. Soydas and U. Bozkaya, JCTC, 9, 1452-1460 (2013)].
  • subset
    • 'small' <members_description>
    • 'large' <members_description>
    • 'RSE30' smaller systems in RSE42
    • '<subset>' <members_description>

S66by8

Database (Hobza) of interaction energies for bimolecular complexes.
Geometries and reference interaction energies from Rezac et al. JCTC 7 2427 (2011).
Note that the S66by8-N-1.0 members are not quite the same geometries as S66-N.
  • cp 'off' || 'on'
  • rlxd 'off'
  • subset
    • 'small'
    • 'large'
    • 'equilibrium'
    • 'HB' eight-point (0.9, 0.95, 1.0, 1.05, 1.1, 1.25, 1.5, 2.0) \(\times R_{eq}\) dissociation curve hydrogen-bonded systems
    • 'MX' eight-point (0.9, 0.95, 1.0, 1.05, 1.1, 1.25, 1.5, 2.0) \(\times R_{eq}\) dissociation curve mixed-influence systems
    • 'DD' eight-point (0.9, 0.95, 1.0, 1.05, 1.1, 1.25, 1.5, 2.0) \(\times R_{eq}\) dissociation curve dispersion-dominated systems

BAKERJCC93

Database of molecules that are challenging to optimize.
Geometries from Baker J. Comput. Chem. 14 1085 (1993), as reported in Bakken and Helgaker, J. Chem. Phys. 117, 9160 (2002), with a few further corrections.
No reference energies defined.
  • cp 'off'
  • rlxd 'off'
  • subset
    • 'small'
    • 'large'

HBC6

Database (Sherrill) of interaction energies for dissociation curves of doubly hydrogen-bonded bimolecular complexes.
Geometries from and original reference interaction energies from Thanthiriwatte et al. JCTC 7 88 (2011).
Revised reference interaction energies from Marshall et al. JCP 135 194102 (2011).
  • cp 'off' || 'on'
  • rlxd 'off' || 'on'
  • benchmark
    • 'HBC60' Thanthiriwatte et al. JCTC 7 88 (2011).
    • \(\Rightarrow\) 'HBC6A' \(\Leftarrow\) Marshall et al. JCP 135 194102 (2011).
    • 'HBC6ARLX' Sherrill group, unpublished.
  • subset
    • 'small'
    • 'large'
    • 'equilibrium' equilibrium points for the six systems
    • 'FaOOFaOO' dissociation curve for formic acid dimer
    • 'FaONFaON' dissociation curve for formamide dimer
    • 'FaNNFaNN' dissociation curve for formamidine dimer
    • 'FaOOFaON' dissociation curve for formic acid- formamide complex
    • 'FaONFaNN' dissociation curve for formamide- formamidine complex
    • 'FaOOFaNN' dissociation curve for formic acid- formamidine complex

HSG

Database (Merz) of interaction energies for bimolecular complexes from protein-indinavir reaction site.
Geometries from and original reference energies from Faver et al. JCTC 7 790 (2011).
Revised reference interaction energies (HSGA) from Marshall et al. JCP 135 194102 (2011).
  • cp 'off' || 'on'
  • rlxd 'off'
  • benchmark
    • 'HSG0' Faver et al. JCTC 7 790 (2011).
    • \(\Rightarrow\) 'HSGA' \(\Leftarrow\) Marshall et al. JCP 135 194102 (2011).
  • subset
    • 'small'
    • 'large'

A24alt

Database (Hobza) of interaction energies for bimolecular complexes.
Geometries from <Reference>.
Reference interaction energies from Rezac and Hobza, JCTC (in press).
  • cp 'off' <erase this comment and after unless on is a valid option> || 'on'
  • rlxd 'off' <erase this comment and after unless on is valid option> || 'on'
  • benchmark
    • '<benchmark_name>' <Reference>.
    • \(\Rightarrow\) '<default_benchmark_name>' \(\Leftarrow\) <Reference>.
  • subset
    • 'small' <members_description>
    • 'large' <members_description>
    • '<subset>' <members_description>

BASIC

Database of simple molecules, mostly for testing.
Geometries from nowhere special, and no reference energies defined.
  • cp 'off'
  • rlxd 'off'
  • subset ['h2o', 'nh3', 'ch4']

SSI

Database (Merz) of interaction energies for protein sidechain-sidechain interactions.
Geometries from Kenneth Merz Group, Univ. of Florida.
Reference interaction energies from <Reference>.
Part of the BioFragment Database (BFDb).
  • cp 'off' || 'on'
  • rlxd 'off'

ACENES

Database of Ed and Rob’s favorite linear acene dimers.
Geometries from nowhere special, and reference energies undefined.
  • cp 'off' || 'on'
  • rlxd 'off'
  • subset
    • 'small'
    • 'large'
    • 'FIRST3' benzene, napthalene, and anthracene dimers
    • 'FIRST5' benzene - pentacene dimers
    • 'FIRST10' benzene - decacene dimers

RGC10

Database (Sherrill) of interaction energies for dissociation curves of rare-gas biatomic complexes.
Geometries and reference interaction energies from Tang et al. JCP 118 4976 (2003).
  • cp 'off' || 'on'
  • rlxd 'off'
  • subset
    • 'small'
    • 'large'
    • 'equilibrium'
    • 'HeHe' 18-point dissociation curve for helium dimer
    • 'HeNe' 18-point dissociation curve for helium-neon complex
    • 'HeAr' 18-point dissociation curve for helium-argon complex
    • 'HeKr' 18-point dissociation curve for helium-krypton complex
    • 'NeNe' 18-point dissociation curve for neon dimer
    • 'NeAr' 18-point dissociation curve for neon-argon complex
    • 'NeKr' 18-point dissociation curve for neon-krypton complex
    • 'ArAr' 18-point dissociation curve for argon dimer
    • 'ArKr' 18-point dissociation curve for argon-krypton complex
    • 'KrKr' 18-point dissociation curve for krypton dimer