Christof Hättig, Ove Christiansen, and Poul Jørgensen
Department of Chemistry, Århus University, DK-8000 Århus C, Denmark

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 ¹S^e state in helium and to the lowest ¹D^e and ¹S^e states in neon and argon. At the CCSD level the rate constant for the ¹D^e transition in argon is in good agreement with the experimental rate constant and also with a recent MCSCF calculation.

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• Multiphoton transition moments and absorption cross sections in coupled cluster response theory employing variational transition moment functionals
  
  
• Derivation of coupled cluster excited states response functions and multiphoton transition moments between two excited states as derivatives of varational functionals
  
  

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