CamCASP/Notes/7

CamCASP => Notes => Using the batch scripts

The ${CAMCASP}/bin/ folder contains a few batch scripts for running sets of jobs at various dimer geometries.

SAPT(DFT) jobs with batch_SAPT.pl

You cannot always perform an energy scan using the ENERGY-SCAN module in CamCASP as this module requires you to use the MC type of basis. If you need to use the MC+, DC or DC+ types of bases, then you will need to use the batch_SAPT.pl script. What this script does is to use a template CLUSTER command file and a file containing the translation and rotation parameters that define the dimer in order to run a batch of SAPT(DFT) (and also SAPT) calculations in an automatic way.

Here are the options:

$ batch_SAPT.pl 
Usage:
    batch_SAPT.pl [-j] job [-geom name] [-clt name] [ -b dc | mc | mc+ | dc+ ]
        -ipa IP(A) -ipb IP(B) [-q queue] [-M memory in MB]

You need to supply:

• The job name. For example, this might be benzene2.
• The name of the geometry file. The default name will be jobname.geom, so if this file is called benzene2.geom, then there is no need to specify it explicitly.
• The name of the CLUSTER command file. See below. As with the geometry file, there is a default value of jobname.clt.
• The type of basis to be used. (Is this now obsolete?)
• The ionisation potentials of the two monomers.
• The name of the queue. As always, there are special 'queues': bg says run the job in the background. The other special 'queue' none may not be usable.
• You can also specify the memory to be used. This memory (in MB) will be passed to DALTON. The memory given to CamCASP should be in the CLUSTER file.

The template CLUSTER file

What the batch_SAPT.pl script does is use a template CLUSTER file to create the various DALTON and CamCASP input files at each dimer geometry. Here's what such a file looks like:

Title Benzene dimer : Sadlej MC+
!
Set Global-data
  CamCASP /home/ajm/CamCASP
  Units Bohr Degree
End

Molecule benzene1
  Units Bohr
  C1   6.0    2.6462324347    0.0000000000    0.0000000000
  C2   6.0    1.3231162173    2.2917045128    0.0000000000
  C3   6.0   -1.3231162173    2.2917045128    0.0000000000
  C4   6.0   -2.6462324347    0.0000000000    0.0000000000
  C5   6.0   -1.3231162173   -2.2917045128    0.0000000000
  C6   6.0    1.3231162173   -2.2917045128    0.0000000000
  H1   1.0    4.7082995437    0.0000000000    0.0000000000
  H2   1.0    2.3541497718    4.0775070135    0.0000000000
  H3   1.0   -2.3541497718    4.0775070135    0.0000000000
  H4   1.0   -4.7082995437    0.0000000000    0.0000000000
  H5   1.0   -2.3541497718   -4.0775070135    0.0000000000
  H6   1.0    2.3541497718   -4.0775070135    0.0000000000
End
Molecule benzene2
  Units Bohr
  C1   6.0    2.6462324347    0.0000000000    0.0000000000
  C2   6.0    1.3231162173    2.2917045128    0.0000000000
  C3   6.0   -1.3231162173    2.2917045128    0.0000000000
  C4   6.0   -2.6462324347    0.0000000000    0.0000000000
  C5   6.0   -1.3231162173   -2.2917045128    0.0000000000
  C6   6.0    1.3231162173   -2.2917045128    0.0000000000
  H1   1.0    4.7082995437    0.0000000000    0.0000000000
  H2   1.0    2.3541497718    4.0775070135    0.0000000000
  H3   1.0   -2.3541497718    4.0775070135    0.0000000000
  H4   1.0   -4.7082995437    0.0000000000    0.0000000000
  H5   1.0   -2.3541497718   -4.0775070135    0.0000000000
  H6   1.0    2.3541497718   -4.0775070135    0.0000000000
End

Rotate benzene2 by alpha about Nx Ny Nz
Place benzene2 at Rx Ry Rz

Files
  Molecules benzene1 and benzene2
  File-prefix JOB
  Basis Sadlej
  Type MC+
  Midbond 3s2p1d Type Weighted
  Aux-basis aTZ
  Interface files
  Memory 2 GB
End

Finish

Most of the file is as described in the Users' Guide. But there are important changes. We assume that the second molecule, benzene2 in the example, is to be rotated and translated. So we have included commands to do this:

Rotate benzene2 by alpha about Nx Ny Nz
Place benzene2 at Rx Ry Rz

But the actual rotations and translations are not specified. Instead we have used tags alpha,Nx,Ny,Nz for the rotation angle (degrees) and axis, and tags Rx Ry Rz for the point (in Bohr) at which the benzene2 molecule will be placed. The units used can be changed but they must be consistent with those used to create the geometry file. The batch_SAPT.pl script will replace these tags by actual values.

The other change is the job name: This has been specified as

File-prefix JOB

and will be replaced by the actual job name by the batch_SAPT.pl script. The actual job name will be the job name given to this script and an additional '_###' numerical index taken from the geometry file. This helps to keep the runs distinct from each other.