The far infrared spectrum of trans-formic acid: An extension up to 175 cm?1 |
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| Authors: | Adriana Predoi?Cross Michel Herman Luciano Fusina Gianfranco Di Lonardo |
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| Institution: | 1. Department of Physics and Astronomy, University of Lethbridge, 4401 University Drive, Lethbridge, AB, Canada T1K 3M4;2. Laboratoire de Chimie Quantique et Photophysique, CP 160/09, Faculté des Sciences, Université Libre de Bruxelles, 50 Avenue Roosevelt, B-1050 Bruxelles, Belgium;3. Dipartimento di Chimica Fisica e Inorganica, Facoltà di Chimica Industriale, Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy |
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| Abstract: | The far infrared spectrum of HCOOH was recorded at a high resolution (0.0009 cm?1) and long path length (72 m) at the far-infrared beamline, Canadian Light Source. Spectra were recorded in the region 62–300 cm?1, showing transitions from the trans-isomer.Ground state rotational transitions with Ka up to 30, were identified up to 175 cm?1, extending the observation reported in the literature. A total of 3321 transitions were assigned and fitted together with previous (4149) published data. An improved set of rotational parameters was obtained adopting the symmetric top (A) reduction of the rotational Hamiltonian in the Ir representation. The newly measured far infrared transitions allowed the determination of all diagonal and off diagonal 8th order parameters L and of some of the diagonal 10th order parameters P. |
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