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  • Title: Analysis of Rotational and Rovibrational Spectra of SiDF(3) in the Ground and v(4) = 1 Excited States.
    Author: Margulès L, Cosléou J, Bocquet R, Demaison J, Bürger H, Mkadmi EB.
    Journal: J Mol Spectrosc; 1999 Nov; 198(1):1-9. PubMed ID: 10527774.
    Abstract:
    This paper presents the analysis of the spectra of SiDF(3) in its vibrational ground and v(4) = 1 states. The pure rotational spectrum of the ground state was measured up to 903 GHz (J" = 65). Rotational, quartic, and sextic centrifugal distortion constants were accurately determined. Furthermore the parameter ||h(3) || = 7.64(11) x 10(-4) Hz was derived from the observation of A(1)-A(2) splittings of six K = 3 lines. The assignment of the v(4) = 1 spectrum was performed by combining 140 pure rotational frequencies and more than 2300 rovibrational transitions. Among them, because of the strong (+/-2, -/+4) interaction, there are more than 90 A(1)-A(2) resolved split transitions between the (l = 0, k = +/-3) ground state levels and the (l = +/-2, k = -/+1) v(4) = 1 levels. Although the v(4) band is located at about 994.3 cm(-1), the energies of the other fundamental bands are at a distance of more than 140 cm(-1). The assumption of the isolated character of the state was confirmed by the small differences between the v(4) = 1 state and the ground state parameters and by the possibility of using the D and Q reduction schemes proposed by E. I. Lobodenko, O. N. Sulakshina, V. I. Perevalov, and Vl. G. Tyuterev [J. Mol. Spectrosc. 126, 159-170 (1987)]. Copyright 1999 Academic Press.
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