The vibrational spectra of molecular ions isolated in solid neon. XI. NO+2, NO−2, and NO−3

Abstract

When a Ne:NO2 or a Ne:NO:O2 sample is codeposited at approximately 5 K with a beam of neon atoms that have been excited in a microwave discharge, infrared absorptions of NO+2, NO−2, and NO−3 appear. Detailed isotopic substitution studies support the assignment of prominent absorptions to ν3 of NO+2 and NO−2 and of weak to moderately intense absorptions to the ν1+ν3 combination band of each of these species. When the contribution of anharmonicity is considered, the positions of the NO+2 absorptions are in satisfactory agreement with the values for the stretching fundamentals obtained in a recent gas-phase study of that species. When the sample is exposed to 240–420 nm mercury-arc radiation, the initially present absorptions of NO−3 trapped in sites with a small residual cation interaction diminish in intensity, and the unsplit ν3(e′) absorption of isolated NO−3 grows. The mechanism responsible for this growth in the absorption of isolated NO−3 is considered.