Two-photon spectroscopy of the NO–Ne complex

Abstract

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.