Knowledge Bank

Precision linestrengths and self-broadened lineshapes in the fundamental bands of HF and HC1 at T=295 K have been measured with a high-resolution difference-frequency laser spectrometer. The intensity measurements were carried out under low-pressure. Doppler-limited conditions with high-purity samples yielding accurate integrated band strengths $(SvI=390(4), 113(1), 38(1)cm-2 atm-1)$, transition moments ( Debye), and linear Herman-Wallis factors ($c1=-0.0521(2),-0.0256(1),-0.0253(2)$) for HF, $H35Cl$ and $H37Cl$ respectively. The self-broadening measurements were made for pressures less than -200 Torr to minimize polymerization. Lineshape profiles incorporating collisional narrowing effects were least-squares fit to the data in order to extract the broadening coefficients and diffusion constants for these gases.