Photodissociation of methylnitrite in the vacuum ultraviolet. I. Identification and quantum yields of electronically excited NO products

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Abstract
The fluorescence of the photofragments resulting from vacuum ultraviolet photodissociation of methyl nitrite (CH3ONO) in the gas phase has been studied using synchrotron radiation from Orsay Electron Storage Ring (ACO) as the source of excitation. In the spectral region between 1100 and 1600 Å where CH3ONO shows a diffuse absorption spectrum, the formation of NO in A 2Σ+ (v′=0,1,2), C 2Π and D 2Σ+ has been identified by time and energy‐resolved spectra. The quantum yields of the photodissociation channels leading to the NO (A,C,D) states have been determined by comparison of the emission intensity with that of pure NO directly excited in A 2Σ+, C 2Π, v′=0, D 2Σ+, v′=0: φ (CH3ONO→NO A)=0.18±0.03 at λexc=1440 Å; φ (CH3ONO→NO C, v′=0)=0.07±0.02 at λexc=1380 Å; and φ (CH3ONO→NO D, v′=0)=0.05±0.02 at λexc=1200 Å.

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