New electronic states of NH and ND observed from 258 to 288 nm by resonance enhanced multiphoton ionization spectroscopy

Abstract

Three new electronic states of NH and ND (imidogen radical) have been observed by REMPI (resonance enhanced multiphoton ionization) spectroscopy in the region of 258 through 288 nm and assigned. The NH (ND) was produced by the photolysis of HN3 (DN3) (hydrazoic acid) in the same wavelength region. The observed two-photon transitions are from the a 1Δ state to 3p Rydberg states. Transitions were also observed from the a 1Δ state to the d 1Σ+ state. The new state assignments are: f 1Π (3pσ) at 86 378 cm−1, g 1Δ (3pπ) at 88 140 cm−1, and h 1Σ (3pπ) at 89 531 cm−1. Rotational constants (B and D) and, where possible, vibrational spacings for the thirteen observed bands are also determined.