The 0 → 3 Overtone Band of CO: Precise Linestrengths and Broadening Parameters

Temperature dependence of self- and N2-broadeningand pressure-induced shifts in the 3←0 band of CO

“…Fig. 8 shows our N 2 broadening results and those of Hennigsen et al [3], both for room temperature and using a Voigt profile in the fitting routine. The two sets are in agreement within the combined estimated error bars.…”

Absolute Rovibrational Intensities and Self-Broadening and Self-Shift Coefficients for the X1Σ+V=3←V=0 Band of 12C16O

“…The v = 3 ← v = 0 (11) and v = 2 ← v = 0 (20) bands of CO were used for wavenumber standards for spectra obtained with the multiple reflection cell. The corrections applied to the wavenumbers ranged from Toth et al 5 1.84(10) 1.18 (7) 18(10) Bouanich et al 6 1.75(6) 1.18(7) b 18(10) b Henningsen et al 9 1.697 (17) The slopes of plots of the corrected wavenumbers versus total gas pressure were taken as the wavenumber shift, δ(cm −1 /atm); an example of such a plot is given in Fig. 3 for the m = −14 transition.…”

“…The |R 3-0 | 2 value from Ref. (9) has been adjusted to account for the fact that these authors used a slightly different partition function and reported values for natural abundance rather than pure sample. The more modern measurements of |R 3-0 | 2 fall about 8.6% below the value of Toth et al (5), which is the basis of the current HITRAN CO line intensities.…”

“…More recently two groups, Picqué and Guelachvili (8) using a FTS and Henningsen et al (9) using a diode laser, both obtained a value of |R 3-0 | 2 about 8-10% smaller than the value reported by Toth et al (5). Since we have recently obtained results of |R 2-0 | 2 for CO (10) which also differ from the value we used to determine the EDMF of CO (4), we decided to check the recent intensity results for the v = 3 ← v = 0 band before redetermining the EDMF.…”

The ν1+ν3 and the ν1+ν2+ν41+ν5−1 Combination Bands of 13C2H2. Linestrengths, Broadening Parameters, and Pressure Shifts

“…The fourth scan is performed with retracted mirror and measures the Fabry-Perot fringes which provide the basis for constructing a linear frequency axis. In previous investigations (11,12) the Fabry-Perot fringes were recorded in synchronism with each individual scan. Although the fringe pattern as a whole would drift over time due to temperature variations in the laboratory, this would not affect the resulting frequency axis, which is based on the separation between fringes.…”