A STUDY OF THE STRENGTHS AND WIDTHS OF LINES IN THE $10 \mu N_{2}O$ BANDS

Abstract

The line strengths, and foreign and self-broadened widths of 24 lines in $10 \mu N_{2}O$ band have been determined by measuring transmittance vs. pressure using a branch selected $N_{2}O$ laser. As the absorbing $N_{2}O$ is admitted to an evacuated 10 meter White multiple-pass absorption cell, the transmission at first decreases and then reaches a steady value. The constant value of extinction coefficient observed at pressures above 30 torr is in accord with the Lorentzian line shape, but instead, it is necessary to use Veigt line shape at the lower pressures. The laser measurements indicate a knowledge about distributions of the line strengths, foreign and self-broadened width as a function of J-value, which is in agreement with the theoritical results. Also, the spectral line shift of about $0.09 cm^{-1}atm^{-1}$ due to pressure increase was obtained.