Temperature-dependent pressure broadened line shape measurements in the ν 1+ν 3 band of acetylene using a diode laser referenced to a frequency comb

Low-pressure line-shape study in molecular oxygen with absolute frequency reference

“…16,17 Significantly increased frequency precision and accuracy offered by the OFC was also used in cw-laser molecular spectroscopy resulting in the OFCreferenced measurements. Numerous examples include precise measurements of absolute line positions and molecular structure of I 2 , 18,19 the first comb-referenced measurements of line-shape profiles in 13 C acetylene, 20 the study of temperature and pressure dependence of line shapes in acetylene, 21,22 the precise measurements of CO 2 transition frequencies at 4.3 μm, 23,24 or the line-shape studies aimed at the redetermination of the Boltzmann constant. 25 The Pound-Drever-Hall locked frequency stabilized cavity ring-down spectrometer (PDH-locked FS-CRDS) 26 assisted by the OFC enabled determination of the absolute positions of the weak lines from the oxygen B band 27 and CO 2 lines 28 together with the self-shifting coefficients.…”

Infrared absorption by pure CO 2 near 3340 cm −1 : Measurements and analysis of collisional coefficients and line-mixing effects at subatmospheric pressures

“…1. These asymmetrical signatures do not seem to result from limited accuracy of the gas pressure measurement as observed by Cich et al [34], because they are still present, although reduced, when single spectrum fitting is applied to these low pressure spectra. We believe that they are associated with an asymmetry of the observed line shapes, originating from some phase error or a misalignment of the interferometer at the time of recording.…”

O2-broadening coefficients of acetylene lines in the ν4+ν5 band at room temperature

“…In Refs. [53,54], it was found that acetylene spectra measured over a wide range of pressure and temperature were better reproduced using the SDVP than the RP and GP.…”

“…While a large number of studies devoted to the determination of spectroscopic parameters of C 2 H 2 used the VP, RP and GP [34][35][36][37][38][39][40][41], the SDVP was recently used to test the speed dependence effect on the collisional broadening and shifting parameters of acetylene lines [53][54][55]. In Refs.…”