Study on the Rovibrational Interactions and a1/a2 Splittings in the v3/v5/v6 Triad of CH3D

O. N. Ulenikov, G. A. Onopenko, N. E. Tyabaeva, J. Schroderus, S. Alanko

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15 Citations (Scopus)


High-resolution Fourier transform infrared spectrum of CH3D has been recorded in the region of the fundamental bands v3, v5, and v6 between 900 and 1700 cm-1. High sensitivity of the equipment used as well as high accuracy of the recorded line positions gave the possibility of assigning the first-time transitions with the upper state J quantum number up to 23. In the analysis the new ground vibrational state information [O. N. Ulenikov, G. A. Onopenko, N. E. Tyabaeva, J. Schroderus, and S. Alanko, J. Mol. Spectrosc. 193, 249-259 (1999)] were used. In addition, modification of the Hamiltonian model of the interacting vibrational states (v3 = 1), (v5 = 1), and (v6 = 1) allowed the theoretical description of numerous effects and peculiarities in the spectrum. In particular, sets of a1/a2 splittings have been assigned and explained, not only for upper state K = 1 and 2 but also for K = 4 and 5. Moreover, unusually giant exotic splittings have been found for K = 7. The spectroscopic parameters reproducing the initial experimental energies with accuracy close to the experimental uncertainty have been determined.

Original languageEnglish
Pages (from-to)1-15
Number of pages15
JournalJournal of Molecular Spectroscopy
Issue number1
Publication statusPublished - 1 Jan 2000

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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