High-Order Resonance Interactions in HDO: Analysis of the Absorption Spectrum in the 14980–15350 cm−1 Spectral Region

Experimental and Ab Initio Studies of the HDO Absorption Spectrum in the 13165–13500 cm−1 Spectral Region

“…(Note that the spectroscopic constants of this Hamiltonian have the same meaning as those used in the traditional Watson Hamiltonian.) In contrast with the H 2 16 O molecule, which has distinct polyad structure, no clear resonance polyad scheme was evidenced in HDO. It is then difficult to fix a priori the possible resonance, especially at a high degree of vibrational excitation.…”

“…These unusual high-order resonances may result from strong centrifugal distortion effect induced by the excitation of the large-amplitude bending vibration (4). An interesting example of the intensity redistribution from A-to B-type transitions of the 2 ϩ 4 3 band due to the coexistence of both Fermi-and Coriolis-type interactions among the resonance triad was also evidenced (2).…”

“…In Ref. (2), where the 2 ϩ 4 3 absorption band centered at 15 166.104 cm Ϫ1 was investigated, strong resonance interactions between the (014), (142), and (0 12 0) vibrational states were revealed, leading to the observation of many absorption lines belonging to the 1 ϩ 4 2 ϩ 2 3 and the 12 2 bands which borrow their intensities from the strong 2 ϩ 4 3 band lines partners. These unusual high-order resonances may result from strong centrifugal distortion effect induced by the excitation of the large-amplitude bending vibration (4).…”

“…(1,2) aimed at the analysis of the near-infrared and visible absorption spectrum of HDO. The isotope substitution of one of the hydrogen atoms by deuterium strongly influences the intramolecular dynamics (3) and then changes the characteristics of the observed spectra.…”

Emission Spectrum of Hot HDO in the 380–2190 cm−1 Region

“…Most notably, Campargue and co-workers (32)(33)(34)(35)(36) have recently used the ultrasensitive technique of intracavity laser absorption spectroscopy to measure a number of overtone bands. Our contribution in this area has been to record long path Fourier transform absorption spectra in the 16300-22800 cm ¢ region (37).…”