The High-Resolution Fourier Transform Spectrum of Dideuterated Methane CH2D2in the Region between 1900 and 2400 cm |
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| Authors: | Oleg N Ulenikov Eizi Hirota Mitsuru Akiyama S Alanko M Koivusaari R Anttila G Guelachvili R N Tolchenov |
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| Institution: | aThe Graduate University for Advanced Studies, Hayama, Kanagawa, 240-01, Japan;bInformation Science Laboratory, Tokai University, 1117 Kitakaname, Kanagawa, 259-12, Japan;cDepartment of Physical Sciences, University of Oulu, Linnanmaa, SF-90570, Oulu, Finland;dLaboratoire de Physique Moléculaire et Application, CNRS UPR No. 136, Université Paris-sud, Bâtiment 350, 91405, Orsay, Cedex, France;eLaboratory of Molecular Spectroscopy, Physics Department, Tomsk State University, Tomsk, 634050, Russia |
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| Abstract: | The infrared spectrum of doubly deuterated methane CH2D2has been recorded in the region from 1900 to 2400 cm−1at almost Doppler-limited resolution by using two high-resolution Fourier transform spectrometers. The vibrational bands observed include 2ν4, ν4+ ν7, 2ν7, ν2, ν8, ν4+ ν9, and ν7+ ν9, which were analyzed by taking into account Coriolis and Fermi interactions among them and also those with ν4+ ν5, ν3+ ν7, and ν5+ ν7. Most of the centrifugal distortion constants were constrained to appropriate values, while the vibrational term value and three rotational constants in each of the seven excited states were adjusted along with Coriolis and Fermi interaction parameters by the least-squares analysis of the observed spectrum. The vibration–rotation interaction constants αsthus determined for the ν2and ν8states were combined with those of other fundamental states already published to calculate the equilibrium C–H distance. |
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