Direct retrieval of lineshape parameters: Absolute line intensities for the ν2 band of CH3D

Measurements and theoretical calculations of self-broadening and self-shift coefficients in the ν2 band of CH3D

“…The m 2 band of 12 CH 3 D is the lowest band of a polyad of nine interacting vibrational states analyzed by Nikitin et al [6]. Foreign-and self-broadening and pressure-shift coefficients were obtained by Devi et al [7][8][9][10][11][12] for a few thousand transitions in the m 3 , m 5 , and m 6 bands of 12 CH 3 D. For the m 2 fundamental, Chackerian and Guelachvili [13] measured the intensities and self-broadening of R (0,0) and 7 P-branch transitions, while Suarez et al [14] obtained widths of 18 P-branch transitions. At shorter wavelength, Boussin et al [5] have reported line intensities and self-broadening coefficients for 221 transitions in the 3m 2 band of CH 3 D, 20 of which were reproduced to within 1.2% on average by Plateaux et al [15].…”

Analysis of the CH3D Nonad from 2000 to 3300 cm−1

“…Each intensity is normalized for a gas sample that is 100% abundance of CH 3 D, but no corrections have been made for the natural abundance of 12 CH 3 D vs 13 CH 3 D nor the observed 0.3% impurity of 12 CH 4 . The original temperature of the gas sample from which the measurement has been taken is shown, but each listed intensity is normalized to the corresponding value at 296 K; temperature uncertainty is 1.5 K for paths lengths greater than 11 cm, and 3 K for the three short cells (10.0, 5.00, and 2.05 cm).…”

“…In the latter study (16), assignments given at 3.3 µm initially in 1972 by Olson (11) and at 4.8 µm by Chackerian et al (13) were extended to all nine bands of the nonad. By treating all states simultaneously, 5208 positions of the nonad bands and 1007 nonad intensities were reproduced to ±0.0047 cm −1 and ±4.3%, respectively, and 2467 nonad-triad positions were fitted to ±0.0043 cm −1 .…”

“…Its ground state has been determined for both 12 CH 3 D (3, 4) and 13 CH 3 D (5). Most infrared studies have been devoted to the bands within the triad region containing the three lowest fundamentals, ν 6 , ν 3 , and ν 5 (3,(5)(6)(7)(8)(9)(10), while the region of the three highest fundamentals ν 2 , ν 1 , and ν 4 has received less attention (11)(12)(13)(14)(15)(16).…”

Rovibrational Intensities of the (0003) ← (1000) Dyad Absorption Bands of 12C16O2

“…Line intensities and positions were determined using nonlinear least-squares fitting of the spectra (9,10). Line profiles were computed using the laboratory conditions for each spectrum, the instrumental profile, and the self-broadening coefficient for each line as given in the HITRAN compilation (11).…”