2-PHOTON SPECTROSCOPY OF THE NO-NE COMPLEX

Electronic states of the NO-Ne complex correlating with several low ly ing Rydberg states of the NO molecule are investigated using (2+1) res onance enhanced multiphoton ionization. The observed band systems for the states F (2)Delta, E (2)Sigma, and C (2)Pi consist of at least two vibrational bands assigned to the stretching mode. For the H (2)Pi st ate five members of the stretch progression are observed. Binding ener gies range from 120 to 280 cm(-1). The rotational structure of the obs erved. bands is analyzed using a rigid rotor Hamiltonian. Jacobi bond angles between 50 degrees and 85 degrees are found for the vibrational ly averaged structures. Spectra for the NO-X complexes (X=Ar, Ne) corr elating with the vibrational levels C (2)Pi upsilon' (NO)=0, 1, and 4 exhibit a constant red shift. The anomalous red shift found for the le vels upsilon' (NO)=2, 3 indicates a change in the degree of mixing wit h the state B (2)Pi upon complexation. (C) 1998 American Institute of Physics. [S0021-9606(98)00744-2].