SOLID N2 SURFACE STUDIES, FUNDAMENTAL AND FIRST OVERTONE REGIONS

Abstract

Infrared emission spectra of $N_{2}$, frozen onto a Cu plate at 10K, were obtained in the $N_{2}$ fundamental region near $5 \mu m$, and in the first overtone region near $2.6 \mu m$, at $0.003 \mu m$ resolution. The solid $N_{2}$ was excited by $N_{2}$ gas passed through the microwave discharge of the COCHISE (COld CHemical Infrared Simulation Experiment) reaction cell, and the emissions were measured by a cryogenic monochromator. Spectra were obtained for various mole fractions of $N_{2}$ in Ar in the discharge flow. Counterflows of non-excited $N_{2}$ or Ar were also investigated. Lines of the 1-0 and 2-0 bands, and in some spectra the 3-1 band, were identified. In addition, ground state vibrational excitation up to the A-state energetic limit was observed. The dependence of these spectra on the composition of the discharge flow and the counterflow will be discussed.