Ã←transition of Rg·NO complexes (Rg=rare gas) observed using resonance-enhanced multiphoton ionization (REMPI) spectroscopy Xe·NO

Abstract

The Ã←transition of the Xe·NO molecular complex has been studied using one-colour (1+1) resonance-enhanced multiphoton ionization (REMPI) spectroscopy. The spectrum shows a complicated vibrational structure, which terminates in a sharp cut-off. The spectrum was recorded in both the Xe·NO⁺ and the Xe⁺ mass channels; both spectra showed identical structure, except (i) the relative intensities of some of the features differed between the two spectra and (ii) Xe* transitions were observed in the Xe⁺ mass channel. The appearance of the Xe·NO spectrum in the Xe⁺ mass channel is discussed. The spectra allow the T₀ value of the Ã←transition to be measured as 44163.2 cm^-1 , as well as estimates to be made of the dissociation energy of both the and Ãstates: 121 and 157 cm^-1, respectively. The vibrational structure observed in the spectrum was not analysed. No Ã←spectra of Ne·NO were observed under any of the conditions used. Trends in the spectroscopy and bonding of the Ãstate of the Rg·NO complexes (Rg=rare gas) are discussed, and the Ãstates of Ne·NO and He·NO are concluded to be either very weakly bound or dissociative.