Molecule, linear quasilinear

This molecule is quasilinear with a very small barrier to linearity. Here it was treated as linear and the value was derived from the very accurate value = 8.022966 cm. This simplistic model probably explains the discrepancy with ab initio values 1.030-1.034 A. 

When C, = 1 the molecule is linear when = 0 is bent. Intermediate cases (such as quasilinear molecules, Bunker, 1983) have 0 < < 1. 

Beyond the early work on acetylene (van Roosmalen et al., 1983a see also van Roosmalen, Benjamin, and Levine, 1984, and Benjamin, van Roosmalen, and Levine, 1984, for the work on the stretch modes), much of the algebraic approach to tetratomic molecules is yet to be fully published. We specifically draw attention to the thesis work of Lemus (1988), which contains important details on the Clebsh-Gordan coefficients of 0(4), and the theses of Viola (1991) and Manini (1991). The formalism necessary to describe linear and quasilinear molecules can be found in Iachello, Oss, and Lemus (1991b) Iachello, Manini, and Oss (1992) and Iachello, Oss, and Viola (1993a,b). See also Bemardes, Hornos, and Homos (1993). 

Linear (and quasilinear) tetratomic molecules. For linear and quasilinear tetratomic molecules we use a notation similar to that of Eqs. (C.2) and (C.4). Written explicitly, the Hamiltonian of linear tetratomic molecules is... 

See, e.g., M. Hargittai, I. Hargittai, Linear, bent, and quasilinear molecules. In Structures and Conformations of Non-rigid Molecules, J. Laane, M. Dakkouri, B. van der Veken, and H. Oberhammer, eds., NATO ASI Series C. Mathematical and Physical Sciences, Vol. 410, pp. 465-489, Kluwer Academic Publishers, Dordrecht, Boston, London, 1993. 

The microwave spectra of gaseous CsOH have been studied in a high temperature spectrometer by Kuczkowski et al. (9) and Lide et al. (10). The spectroscopic data were more consistent with patterns expected from a linear molecule, although a "quasilinear" structure could not be completely eliminated. Acquista et al. ( ) observed the infrared spectra of CsOH and... 

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