resp

Response properties based on DFT/HF theory. 

Keywords

IPRT

Print level, >1 gives more information, >2 give more information about integral evaluations.

NPRT

METHOD

=1, ground state gradients; =2, excited-state calculations which will load TD-DFT output.

CHCK GEOM LINE QUAD FNAC POLA HYPE FDIF AOPER BOPER COPER BFREQ CFREQ REDUCED NORESP IGNORE SINGLE STATES DOUBLE PAIRS STEP BOHR NORDER CTHRD IPROPS NFILES

Quick guides by examples

The following examples give the minimal inputs for starting response calculations:

Example: first-order NAC

$COMPASS
Title
 nh3
Basis
 sto-3g
Geometry
 C                  0.00000000   -1.20809142   -1.14173975
 C                  0.00000000   -1.20797607    0.25342015
 C                  0.00000000    0.00000000    0.95085852
 C                 -0.00000000    1.20797607    0.25342015
 C                 -0.00000000    1.20809142   -1.14173975
 C                  0.00000000    0.00000000   -1.83922155
 H                  0.00000000   -2.16045397   -1.69142002
 H                  0.00000000   -2.16044427    0.80300713
 H                 -0.00000000    2.16044427    0.80300713
 H                 -0.00000000    2.16045397   -1.69142002
 H                  0.00000000    0.00000000   -2.93882555
 F                  0.00000000    0.00000000    2.30085848
End geometry
skeleton
group
c(1)
nosym
$END

$xuanyuan
direct
schwarz
$end

$scf
RHF
charge
0
spin
1
THRESHCONV
1.d-10 1.d-8
OPTSCR
1
iaufbau
0
$end

$tddft
imethod
1
isf
0
iexit
2
itda
1
idiag
1
istore
1
crit_e
1.d-10
crit_vec
1.d-8
lefteig
AOKXC
DirectGrid
$end

$resp
iprt
1
QUAD
FNAC
single
states
1
1 1 2
double
pairs
1
1 1 1 1 1 2
norder
1
method
2
nfiles
1
FDIF
step
0.001
ignore
1
noresp
$end

To use finite-difference, a script fdiff.py should be used as

./fbdiff.py run.sh input.inp > log

After the calculation is done, an output file input.out will present in the current directory. The log file saves the information during the calculations.

Note: If FDIF is omitted, the analytic calculation will be carried out by simply using the run.sh script.