The ground state of NO splits into two spin orbit states (2pi1/2 and 2pi3/2). Does anybody know how to compute the energies of these states using either Gaussian or Molpro?
Molpro uses the state interacting method to calculate spin-orbit coupling. First you calculate the spin-free MRCI or CASSCF wave function, and then you use the CI code to calculate SO matrix elements between these and diagonalize the result. For extensive details see the manual.
Molpro uses the state interacting method to calculate spin-orbit coupling. First you calculate the spin-free MRCI or CASSCF wave function, and then you use the CI code to calculate SO matrix elements between these and diagonalize the result. For extensive details see the manual.