Rami
rami.gherib@mail.utoronto.ca
I am trying to perform a geometry optimization while constraining one of the torsional angles in my molecular system. I'm using state-averaged CASSCF and I would like to optimize on the ground state potential energy surface. The problem I am facing is that during the optimization, the torsional angle that is intended to be fixed, changes significantly (from 110 to 128.6 degrees). I using the following commands to fix the desired torsional angle:
nzvar=1 ! in $CONTRL
and
$ZMAT DLC=.T. AUTO=.T. nonvdw(1)=1,26
IFZMAT(1)=3,3,4,14,17
$end
I would also like to mention that I used the same set of commands to optimize the same molecule at a different fixed angle on the excited state surface. The latter did not have this problem. The input and output files are attached.
Thank you,
Rami
![]() | This message contains the 6603 kb attachment [ v90copt.out ] output file |
[ This message was edited on Fri May 18 '18 at 10:18pm by the author ]