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Two-photon spectroscopy of the NO–Ne complex

The Journal of Chemical Physics, 1998
Electronic states of the NO–Ne complex correlating with several low lying Rydberg states of the NO molecule are investigated using (2+1) resonance enhanced multiphoton ionization. The observed band systems for the states F 2Δ, E 2Σ, and C 2Π consist of at least two vibrational bands assigned to the stretching mode. For the H 2Π state five members of the stretch progression are observed. Binding energies range from 120 to 280 cm−1. The rotational structure of the observed bands is analyzed using a rigid rotor Hamiltonian. Jacobi bond angles between 50° and 85° are found for the vibrationally averaged structures. Spectra for the NO–X complexes (X=Ar, Ne) correlating with the vibrational levels C 2Π v′(NO)=0, 1, and 4 exhibit a constant red shift. The anomalous red shift found for the levels v′(NO)=2, 3 indicates a change in the degree of mixing with the state B 2Π upon complexation....Read more
TWO-PHOTON SPECTROSCOPY OF THE NO-NE COMPLEX YANGSOO KIM, JULIAN FLENIKEN, and HENNING MEYER
TWO-PHOTON SPECTROSCOPY OF THE NO-NE COMPLEX YANGSOO KIM, JULIAN FLENIKEN, and HENNING MEYER, Department of Physics and Astronomy, University of Georgia, Athens, GA 30602-2451. In our recent work on NO-Ar complexes we have shown how the rotational structure of the two-photon spectra can be analyzed in terms of the spherical tensor components of the two-photon absorption operator characteristic to the transition in the bare NO molecule. Due to spectral congestion we have not yet been able to analyze the NO-Ar spectra in the region of the Rydberg states F and H , H’ . In this contribution, we will present the analogous results for the NO-Ne complex. Because of the weaker interaction, the various band systems correlating with the Rydberg states C (v =1,2, and 4), E , F , and H , H’ are well separated from each other. Apart from the H state for which a five membered stretch progression is observed, the spectra assigned to the lower Rydberg states show only transitions to two stretch vibrational levels. Spectra associated with the vibrational levels of the C state show very different predissociation behavior compared to the corresponding NO-Ar spectra. The results indicate important differences in electronic state mixing between the C and B states upon complexation. H. Meyer, J. Chem. Phys. 107, 7732(1997). H. Meyer, J. Chem. Phys. 107, 7721(1997).