THE ELECTRONIC SPECTRUM OF HNO

Abstract

“A new absorption system, in the region 6500 7700$\AA$ has been photographed during the flash photolysis off nitroethane, nitroethane, isoamyl nitrite, and mixtures of nitric oxide and ammonia. The fine structure analysis of the bands of the system and the method of production both strongly suggest that the absorbing molecule is HNO. The analysis of the 0-0 band of the system yields the following ground state rotational constants: {A}_{o}=17.14\mbox{ cm}^{-1}, {B}_{o}=1.11\mbox{ cm}^{-1}, \mbox{and}{C}_{o}=1.31\mbox{ cm}^{-1} By assuming the N-H distance to be $1.02\bar{A}$, the NO distance is determined to be $1.22\bar{A}$ and the HNO angle $102^\circ$. Bands corresponding to the NO stretching frequency and the HNO bending frequency in the upper state have also been analyzed. The rotational constants and the geometry of the molecule in the excited electronic state and a preliminary analysis of the DNO spectrum will also be presented.”