Abstract

The variation with pressure of the contour of the fundamental vibration–rotation band of hydrogen chloride has been examined spectroscopically. A very-short-path-length absorption cell has been designed and built to facilitate this investigation. The intensity of this band has been calculated for pressures of the absorbing gas from 20 to 50 atm. The present work indicates that the band intensity for polar molecules is definitely an increasing function of pressure. The lower limiting value of 154 cm⁻² · atm⁻¹ extrapolated from the present data is consistent with 160±30-cm⁻² · atm⁻¹ value measured by Penner and Weber. The band intensity (cm⁻² · amagat⁻¹) is expressed as a function of density (amagat) and is found to be inversely proportional to the gas density. Evidently, a failure of Beer’s law occurs at the large densities of gas used in this study.

© 1970 Optical Society of America

Broadening of the ν₃ Lines of HCN Due to Argon, Carbon Dioxide, and Hydrogen Chloride*

Robert J. Thibault, Arthur G. Maki, and Earle K. Plyler
J. Opt. Soc. Am. 53(11) 1255-1258 (1963)

Precise Measurements of Some Infrared Bands of Hydrogen Chloride*

D. H. Rank, W. B. Birtley, D. P. Eastman, B. S. Rao, and T. A. Wiggins
J. Opt. Soc. Am. 50(12) 1275-1279 (1960)

Pure-Rotational Raman Scattering in a CO₂ Electric Discharge

JOSEPH J. BARRETT and ALFONS WEBER
J. Opt. Soc. Am. 60(1) 70-76 (1970)

Infrared Spectral Absorption Coefficients for Water Vapor

W. F. HEROET and J. S. MUIRIIEAD
J. Opt. Soc. Am. 60(2) 180-182 (1970)

Self-Broadening Effects in the Infrared Bands of Gases*

A. Anderson, An-Ti Chai, and Dudley Williams
J. Opt. Soc. Am. 57(2) 240-246 (1967)