High-resolution photofragmentation spectroscopy and global vibronic modeling of N2O+ <i>X</i> 2Π and <i>A</i> 2Σ+ states

Abstract

The spectral signature of N2O+ has been measured in the 30 500–32 500 cm−1 region at high spectral resolution by photodissociation spectroscopy using the STARGATE setup. Seventeen vibronic bands were observed and assigned for the first time. Those were incorporated into a global fit that also includes all low resolution available literature data for the two lowest electronic states, i.e., X2Π and A2Σ+. Renner–Teller and spin–orbit interactions are considered in this global modeling. In addition, a line-by-line rovibronic analysis of the most intense bands enabled the determination of molecular constants of the (v1v2v3) = (101) vibrational state of the A2Σ+ electronic state. This work represents the first global vibronic fit of N2O+ simultaneously treating the X2Π and A2Σ+ states.