کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9575271 | 1504347 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The direct l-type resonance spectrum of CF3CCH in the vibrational state ν10 = 2
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
The direct l-type resonance spectrum of CF3CCH in the vibrational state ν10 = 2 has been measured by means of waveguide microwave Fourier transform spectroscopy in the range 8-26 GHz. Two types of direct l-type resonance transitions induced by the (Îk = ±2, Îl = ±2) interaction could be observed: 262 transitions following the ÎJ = 0, Îk = Îl = 2 selection rule covering values of J = 17-64 and G = â£k â l⣠from 2 to 15, and 75 transitions following the ÎJ = 0, Îk = Îl = 4 selection rule covering values of J = 44-70 and G up to 3. The strong (2, 2) resonance furthermore allowed the observation of A1-A2 splittings of the k = l = ±2 states from J = 63-70. The transitions with G = 3 showed splittings due to the (4, â2) and (0, 6) interactions. The corresponding energy level systems and part of the Hamiltonian matrix are discussed. Strong perturbations due to Î(k â l) = 3 interactions coupling the states k = ±1, l = ±2 and k = ±4, l = ±2 made possible the observation of perturbation-allowed transitions with selection rule k = ±1, l =± 2 â k = 0, l = ±2. Additionally, the J = 2-1 and 3-2 rotational transitions have been measured. A multiple fitting analysis has been performed in which the experimental data have been fitted using five reduced forms of the effective Hamiltonian as proposed by Sarka and Harder [J. Mol. Spectrosc. 197 (1999) 254]. Parameters up to sixth order have been determined including the axial rotational constant A for both values of â£l⣠and the unitary equivalence of the determined parameter sets has been demonstrated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 312, Issues 1â3, 6 June 2005, Pages 159-167
Journal: Chemical Physics - Volume 312, Issues 1â3, 6 June 2005, Pages 159-167
نویسندگان
Ulf Wötzel, Heinrich Mäder, Hauke Harder, Petr Pracna, Kamil Sarka,