J. Chem. Phys. 108, 8355-8359 (1998).
(Received 12 November 1998; accepted 19 Februar 1998)
The implementation of twophoton transition moments is described for the hierachy of coupled cluster models CCS, CC2 and CCSD and applications are reported for the twophoton transition probability rate constants for transitions from the ground state to the first excited 1Se state in helium and to the lowest 1De and 1Se states in neon and argon. At the CCSD level the rate constant for the 1De transition in argon is in good agreement with the experimental rate constant and also with a recent MCSCF calculation.
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