Rovibrational spectroscopy of the Fermi-interacting nu(4)=1 and nu(3) = nu(6)=1 levels of DCF3

0341550 - ÚFCH JH 2011 RIV US eng J - Journal Article
Pracna, Petr - Ceausu-Velcescu, A. - Predoi-Cross, A. - Urban, Š.
Rovibrational spectroscopy of the Fermi-interacting nu(4)=1 and nu(3) = nu(6)=1 levels of DCF3.
Journal of Molecular Spectroscopy. Roč. 259, č. 1 (2010), s. 1-10. ISSN 0022-2852. E-ISSN 1096-083X
R&D Projects: GA AV ČR IAA400400706; GA MŠMT LC06071
Institutional research plan: CEZ:AV0Z40400503
Keywords : deuterated fluoroform * high resolution IR spectroscopy * anharmonic and vibration-rotation resonances
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 1.497, year: 2010

The high-resolution infrared spectrum of deuterated fluoroform (DCF3) Was studied in the 700 and 1200 cm(-1) regions, with the aim of assigning and analyzing the nu(4) CF3 asymmetric stretching vibration. The Fermi-type anharmonic coupling between the nu(4) = 1 and nu(3) = nu(6) = 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 nu(3) + nu(6)/nu(4) band system were confirmed and extended by the identification of the nu(3) + nu(6) - nu(6) and nu(4)-nu(6) bands in the 700 cm(-1) 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 cm(-1) produces a large variety of resonance crossings which involve levels with Delta k = 0,..., 6.
Permanent Link: http://hdl.handle.net/11104/0184492