Vibrational relaxation of hydrogen chloride, deuterium chloride and hydrogen bromide at room temperature

Abstract

The vibrational relaxation times of HCl, DCl and HBr have been determined by a spectrophone method. Shorter limits to the relaxation times are 1.1 × 10–2, 1 × 10–2 and 1.5 × 10 –3 sec respectively. These results agree better with vibration-rotation theory than with vibration-translation theory. The results for HCl is compared with high-temperature shock-tube data.