Low-temperature absorption spectrum of the (0120)-(0000) 13CH4 band. Line assignment
L.N. Sinitsa, V.I. Serdyukov, A.A. Lugovskoi
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: CH, спектр поглощения, низкотемпературная кювета, идентификация, absorption spectrum, low-temperature cell, line assignment
Abstract
The 13CH4 absorption spectra in the range between 7400 and 7600 cm-1 have been recorded at for temperatures from 296 to 200 K by the Fourier spectrometer IFS-125M at a spectral resolution of 0.03 cm-1. A 220 cm cell was used, which provided a threshold sensitivity to absorption on the order of 10-6 cm-1. Line assignment of the n2 + 2n3 band of the 13CH4 molecule was performed. Rotational constants of the (0120) state and the integral intensity of the n2 + 2n313CH4 band were determined for the first time.
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