Strengths and Self-Broadened Widths of the Lines of the Hydrogen Bromide Fundamental Band

Abstract

The strengths and self-broadened half-widths of the lines of the fundamental band of HBr have been measured by a curve-of-growth method. The method uses a correction for two overlapping lines recently devised by Sakai. The squares of the electric dipole matrix elements, |M01(m)|2, for the lines have been calculated from the strengths. From the theory of Herman and Wallis and |M01(0)|2, the dipole moment derivative M1 is found to be 0.468×10—10 esu. From the slope at m = 0 of |M01(m)|2 the vibration—rotation interaction parameter, θ, is found to be 1.20. The dependence of the strengths on rotational quantum number J is compared to the J dependence of the strengths of the other hydrogen halides and is compared to theory. A similar comparison is made for the J dependence of the half-widths.

193 nm photolysis of vinyl bromide: Nascent product distribution of the C2H3Br→C2H2 (vinylidene)+HBr channel

“…20 The coefficient for the 6→5 transition was extrapolated by using a second power polynomial from the first five coefficients. Here the set of A coefficients previously reported for vibrational quantum numbers up to five is used.…”

Pressure broadening and shifting parameters for the spectral lines in the fundamental vibration–rotation bands of HBr and HI in mixtures with rare gases

“…Still, the interactioninduced effects involving heavier members of the HHal family received relatively little attention, so that the available experimental data on the line broadening and shifting in the IR spectra of HBr and HI remained sparse. The first measurement of the self-broadening coefficients determined using the curve-of-growth method applied to the isotopically unresolved fundamental band of HBr was published by Babrov [1]. Close values for the R 1 -branch lines were later obtained with a better resolution by Séoudi et al [2], who demonstrated that the H 79 Br and H 81 Br isotopomers yield, as expected, essentially identical results and also reported the line broadening coefficients for the HBr-CO 2 system.…”

High-Resolution Measurements of HBr Transitions in the First Overtone Band Using Tunable Diode Lasers

“…Most of the infrared spectra of HBr have been studied using grating spectrometers (1,(7)(8)(9)(10)(11)(12). The only laser-based highresolution measurements of HBr were performed in the high overtone bands (v ϭ 0 -6 to 0 -8; Ref.…”