High resolution Fourier transform spectroscopy of CH₂D₂in the region 2350–2650 cm⁻¹: the bands ν₅+ ν₇, 2ν₉, ν₃+ ν₄, ν₃+ ν₇and ν₅+ ν₉

Abstract

The IR spectrum of the CH2D2 molecule has been measured in the region of 2350-2650 cm(-1) on a Bomem DA002 Fourier transform spectrometer with a resolution of 0.004 cm(-1) (FWHM, apodized) and analyzed with a Hamiltonian model which takes into account resonance interactions between all vibrational states in that region. More than 3000 transitions have been assigned to the bands 2nu9, nu3 + nu4, nu5 + nu9, nu5 + nu7 and nu3 + nu7 using ground state combination differences from the known ground state parameters. A set of 115 spectroscopic parameters for the excited vibrational states is obtained from a least squares adjustment. This reproduces the 646 initial upper ro-vibrational energies used in the fit with a d(rms) = 0.0036 cm(-1).

High resolution analysis of C2D4 in the region of 600–1150 cm−1

“…As to the three Coriolis-type resonance interactions, the corresponding non-diagonal blocks of the Hamiltonian (1) can be written in the following form (see, e.g., Refs. [57][58][59] …”

High resolution ro-vibrational analysis of interacting bands ν 4 , ν 7 , ν 10 , and ν 12 of 13 C 2 H 4

“…(2), describes the unpertubed rotational structure of the vibrational state jv〉 and has a form of the reduced effective Hamiltonian in the A-reduction and I r representation (see, e.g., Refs. [49][50][51][52]):…”

Precise ro-vibrational analysis of molecular bands forbidden in absorption: The ν8+ν10 band of the 12C2H4 molecule

“…If ðjvCi jv e Ci ¼ B 1g , then the Coriolis interaction operator of the C type is written as, Refs. [48,49] Table 3 Small part of the list of assigned transitions of the m8 þ m10 band. …”