Ward KM, Duxbury G, Lorono M, Henze W, Davies PB, Newnham DA
Department of Physics and Applied Physics, University of Strathclyde, Glasgow, G4 0NG, United Kingdom
J Mol Spectrosc. 2000 Dec;204(2):268-274. doi: 10.1006/jmsp.2000.8228.
High-resolution infrared spectra of the nu(6) (713 cm(-1)) band region of C(2)F(6) vapor have been recorded at several temperatures. Spectra at 77, 200, and 300 K were recorded using a Fourier transform spectrometer with unapodized resolutions of 0.0018 cm(-1) (200 and 300 K) and 0.008 cm(-1) (77 K). Spectra with rotational temperatures in the range 5-50 K were recorded in a supersonic jet using diode-laser absorption spectroscopy. The nu(6) band contains two clear sequences of hot-bands: one arises from the nu(4) torsional vibration at 67.5 cm(-1); the other, shorter, weaker progression is built on the doubly degenerate nu(9) vibration at 220 cm(-1). They lie to high and low wavenumbers of the fundamental band, respectively. Eleven series were assigned and fitted to these hot bands. A perturbed series in the nu(4) sequence is considered, by analogy with the infrared spectrum of C(2)H(6) vapor, to be caused by an xy-Coriolis interaction either between 5nu(4) and nu(9) + 2nu(4) in the ground state or, in the upper state, nu(6) + 5nu(4) with nu(6) + nu(9) + 2nu(4) or nu(6) + 5nu(4) with 2nu(8). One further series resolved only in the jet spectrum and lying very close to the fundamental is almost certainly due to the nu(6) fundamental of the isotopomer (13)C(12)CF(6). Copyright 2000 Academic Press.
在几个温度下记录了六氟乙烷（C₂F₆）蒸气ν(6)（713 cm⁻¹）带区域的高分辨率红外光谱。使用傅里叶变换光谱仪记录了77、200和300 K时的光谱，未变迹分辨率分别为0.0018 cm⁻¹（200和300 K）和0.008 cm⁻¹（77 K）。在超声速射流中使用二极管激光吸收光谱记录了转动温度在5 - 50 K范围内的光谱。ν(6)带包含两个清晰的热谱带序列：一个源于67.5 cm⁻¹处的ν(4)扭转振动；另一个较短、较弱的序列基于220 cm⁻¹处的双重简并ν(9)振动。它们分别位于基频带的高波数和低波数处。为这些热谱带指定并拟合了11个序列。类似于乙烷（C₂H₆）蒸气的红外光谱，ν(4)序列中的一个受扰序列被认为是由基态下5ν(4)与ν(9) + 2ν(4)之间或激发态下ν(6) + 5ν(4)与ν(6) + ν(9) + 2ν(4)或ν(6) + 5ν(4)与2ν(8)之间的xy - 科里奥利相互作用引起的。在射流光谱中仅分辨出的另一个非常接近基频的序列几乎肯定是由于同位素体¹³C¹²CF₆的ν(6)基频。版权所有2000年学术出版社。
