Saturation Spectroscopy of C2H4 Using a CO2 Laser Sideband Spectrometer

The HITRAN 2004 molecular spectroscopic database

“…The data available in HITRAN2012 for the 10-μm region corresponds to the infrared active ν 10 , ν 7 . It was generated relying on the frequency analysis of Willaert et al [462] , Cauuet et al [463] , Legrand et al [464] and Rusinek et al [465] , and intensities measured for 13 lines of the ν 7 band observed in the range 940-970 cm -1 [466] . Spectroscopic information obtained for the ν 12 band by Rotger et al [467] was added in the 2008 edition [198] .…”

The Ethylene Hot Band Spectrum near 3000 cm−1

“…FTIR Spectra have been populated in collisions with excited SF 6 molecules. To that end, a one-to-one mixture of SF 6 and C 2 H 4 , Applying a long path absorption cell at ambient temperature (295 K) and a heated single pass cell at 417 K, two seeded in Ar, has been expanded and the CO 2 laser has been tuned to a resonance in SF 6 (n 3 R(28)A 2 (0) at 10P14 / 18 different sets of data were taken to characterize hot band transitions of ethylene in the 3 mm region by high resolution MHz (7)). This indirect excitation scheme has been successfully applied by us before in hot band studies of some small Fourier transform spectroscopy.…”

“…Through modulation of the pump beam and phase the spectrum have been rescanned with the CO 2 laser tuned to a resonance with an ethylene n 7 transition and the specsensitive detection of the probe beam, a hot band spectrum against zero background is obtained. Applying this technique trum has been compared to the spectrum obtained from excitation through SF 6 . As can be seen in Fig.…”

“…constants given in Ref. (6), a good assignment has been The ethylene sample with a specified purity of 99.7% was obtained for J £ 15, K £ 5. Nearly 200 lines have thus purchased from Merck-Schuchardt and was used without been assigned to the hot band from n 10 .…”

“…hot band (1) we found also the weak nearby lying n 7 / n 9 In this work a somewhat different pump process has been 0 n 7 hot band (2). The techniques used in previous experi-applied exploiting vibrational energy transfer from n 3 -exments relied strongly on the possibility to resonantly pump cited SF 6 to C 2 H 4 as explained in the Experimental section. some rotational levels of the n 7 mode with a CO 2 laser.…”