Measurement and assignment of the vibrationally resolved UV absorption spectrum of syn-methyl nitrite isolated in an argon matrix at 12 K

A mixture of the syn- and anti-isomers of methyl nitrite was deposited into an argon matrix at 12 K. The anti-isomer was subsequently photolyzed by dye-laser excitation into the red tail of the origin line at 26252 cm−1. The origin of the remaining syn-isomer is found at 27361±10 cm−1, and the first 5 bands are well fitted with an anharmonic oscillator model with ν1=1086±5 cm−1 and xe=0.0180±0.0003.