کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5416072 | 1393794 | 2006 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
CW-cavity ring down spectroscopy of the ozone molecule in the 6625-6830Â cmâ1 region
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The absorption spectrum of ozone, 16O3, has been recorded by CW-cavity ring down spectroscopy in the 6625-6830 cmâ1 region. The typical sensitivity of these recordings (αmin â¼Â 3 Ã 10â10 cmâ1) allows observing very weak transitions with intensity down to 2 Ã 10â28 cm/molecule. 483 and 299 transitions have been assigned to the 2ν1 + 3ν2 + 3ν3A-type band and to the 2ν1 + 4ν2 + 2ν3B-type band, respectively, which are the highest frequency bands of ozone recorded so far under high resolution. Rovibrational transitions with J and Ka values up to 46 and 12, respectively, could be assigned. Despite well-known difficulties to correctly reproduce the energy levels not far from the dissociation limit, it was possible to determine the parameters of an effective Hamiltonian which includes six vibrational states, four of them being dark states. The line positions analysis led to an rms deviation of 8.5 Ã 10â3 cmâ1 while the experimental line intensities could be satisfactorily reproduced. Additional experiments in the 5970-6021 cmâ1 region allows detecting the (233) â (010) hot band reaching the same upper state as the preceding cold band. From the effective parameters of the (233) state just determined and those of the (010) level available in the literature, 329 transitions could be assigned and used for a further refinement of the rovibrational parameters of the effective Hamiltonian leading to a value of 7.6 Ã 10â3 cmâ1 for the global rms deviation. The complete list of the experimentally determined rovibrational energy levels of the (233), (242), and (520) states is given. The determined effective Hamiltonian and transition moment operators allowed calculating a line list (intensity cut off of 10â28 cm/molecule at 296 K), available as Supplementary material for the 6590-6860 and 5916-6021 cmâ1 regions. The integrated band strength values are 1.75 Ã 10â24 and 4.78 Ã 10â25 cm/molecule at 296 K for the 2ν1 + 3ν2 + 3ν3A-type band and to the 2ν1 + 4ν2 + 2ν3B-type band, respectively, while the band intensity value of the (233) â (010) is estimated to be 1.03 Ã 10â24 cm/molecule.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Spectroscopy - Volume 240, Issue 1, November 2006, Pages 1-13
Journal: Journal of Molecular Spectroscopy - Volume 240, Issue 1, November 2006, Pages 1-13
نویسندگان
A. Campargue, S. Kassi, D. Romanini, A. Barbe, M.-R. De Backer-Barilly, Vl.G. Tyuterev,