Nitric acid vapor line parameters measured by CO laser transmittance.

Transmittance curves on pure nitric acid vapor have been determined at CO laser frequencies of 1661.8833 cm(-1), 1693.9957 cm(-1), and 1711.

Pressure-broadened linewidths of the R(9.5)(3/2) NO transition.

Pressure-broadened ir linewidths of nitric oxide are currently used in measurement of its concentration for studies on combustion, chemical kinetics, and air pollution.(1) We have measured the self-broadened width of the R(9.5)(3/2) transition in the NO fundamental band by CO laser transmittance and found a halfwidth of gamma = 0.