کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5415400 | 1393755 | 2010 | 10 صفحه PDF | دانلود رایگان |
The high-resolution infrared spectrum of deuterated fluoroform (DCF3) was studied in the 700 and 1200 cmâ1 regions, with the aim of assigning and analyzing the ν4 CF3 asymmetric stretching vibration. The Fermi-type anharmonic coupling between the ν4 = 1 and ν3 = ν6 = 1 rovibrational levels, already mentioned in an early work of Ruoff et al. [Spectrochimica Acta Part A 31A (1975) 1099-1100], was studied here for the first time under high resolution. Assignments in the ν3 + ν6/ν4 band system were confirmed and extended by the identification of the ν3 + ν6 â ν6 and ν4-ν6 bands in the 700 cmâ1 region, the latter being enhanced near the Fermi crossings of the studied levels. Data from both the hot and difference bands were included in the analysis. The close separation of the studied vibrational levels of about 14.8 cmâ1 produces a large variety of resonance crossings which involve levels with Îk=0,â¦,6. Besides the Fermi (Îk=0,Îl=0) and Coriolis (Îk=±1,Îl=â2) resonances, they were accounted for by inclusion of additional higher-order (Îk=±2,Îl=±2 and Îk=±3,Îl=0) interaction terms between the vibrational states. The least-squares fit of more that 16,000 vibration-rotation transitions provides a quantitative reproduction of data in all bands.
Journal: Journal of Molecular Spectroscopy - Volume 259, Issue 1, January 2010, Pages 1-10