Assignment of a perturbation in the FT-ICLAS spectrum of ¹²C₂H₂ around 12709.5cm^-1

Author： Hurtmans D. Kassi S. Depiesse C. Herman M.

ISSN： 1362-3028

Source： Molecular Physics, Vol.100, Iss.22, 2002-11, pp. : 3507-3511

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Abstract

The vibrational state perturbing the ^J = 17 and 18 rotational states of the zero-order ν₁ + 3ν₃ state of ¹²C₂H₂ is assigned to the state with vibrational energy predicted at ^G_v = 12685.1cm^-1 using the cluster model (EL IDRISSI, M.I., LIÉVIN, J., CAMPARGUE, A. and HERMAN, M., 1999, J. chem. Phys., 110, 2074). The assignment is discussed also in terms of the very special pressure shift behaviour demonstrated previously for absorption lines reaching these levels (HERREGODTS, F., HEPP, M., HURTMANS, D., VANDER AUWERA, J. and HERMAN, M., 1999, J. chem. Phys., 111, 7961). The experimental information arising from a set-up newly running at ULB, called FT-ICLAS brings decisive information in the assignment process. This set-up is described briefly.