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E-Journal of Chemistry
Volume 9, Issue 1, Pages 253-259

High-Resolution Infrared Spectroscopy of the v1 + v4 Band of 14NF3:Reductions of the Rovibrational Hamiltonian

Hamid Najib, Siham Hmimou, and Hicham Msahal

Equipe de Spectrométrie Physique, Département de Physique, Université Ibn Tofaïl, Faculté des Sciences, B.P. 133, Kénitra 14000, Morocco

Received 17 February 2011; Accepted 16 April 2011

Copyright © 2012 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The high-resolution Fourier transform infrared spectrum of nitrogen trifluoride NF3 has been studied in the v1 + v4 perpendicular band region around 1523 cm−1. All experimental data have been refined applying various reduction forms of the effective rovibrational Hamiltonian developed for an isolated degenerate state of a symmetric top molecule. The v1 = v4 = 1 excited state of the 14NF3 oblate molecule was treated with models taking into account ℓ- and k-type intravibrational resonances. Parameters up to sixth order have been accurately determined and the unitary equivalence of the derived parameter sets in different reductions was demonstrated.