Can I do excited state calculations with Jaguar?

Jaguar provides the CIS and TDDFT methods for treating excited states that are single excitations with respect to a closed-shell Hartree-Fock reference.

You can study other kinds of excited state using the following methods:

• If the excited state differs from the ground state in spin multiplicity, then simply specifying the desired multiplicity with the multip= keyword returns the lowest-energy state of that multiplicity.
• If the molecule has symmetry and you want to examine excited states that are distinct by symmetry, you can do that by swapping orbitals in the initial guess. You can do this either by editing an input file that already contains a &guess section and swapping the orbitals by hand, or by using the &orbman section (see the Jaguar User Manual). If the orbitals that you swap are of different symmetries, add the gen section keyword ipopsym=1 to keep the orbitals from switching back again. When you swap orbitals in the guess section, it is not necessary to renumber them or to specify occupancies. Jaguar occupies the orbitals in the order in which they are read.

Keywords: excitation, Jaguar

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