Polarization effects on resonance enhanced two-photon dissociation of H2 by the X→(E F+G K+I) transition via intermediate B and C states

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Abstract
The generalized resonance enhanced two‐photon dissociation (RETPD) cross sections of H2 are calculated for crossed and circular (same‐ and opposite‐sense) polarizations of the two‐photon fields using the reduced density operator formalism for the transitions X 1Σ+g(vg=0, Jg=0–4) →(ω1,ε̂1)VUVB 1Σ+u (C 1Πu)[vi=0, 3, Ji =0(1)–3]→(ω2,ε̂2)UV/visible [(EF+GK)1Σ+g+I 1Πg), Ef,Jf]. The wavelength (λ2) of the second photon is so chosen that ionization from the resonant B(C) state is energetically forbidden. The effects of polarizations on the wavelength and quantum number dependences of RETPD profiles have been studied. For vi=3 of both B and C states, a strong polarization dependence of RETPD cross sections is observed. The same‐ and opposite‐sense circular polarizations have about the same RETPD profiles for the B state except at the shape resonance positions due to the final I state quasibound level, while the profiles are quite different for the C state.