Study on the Rovibrational Interactions and a(1)/a(2) Splittings in the nu(3)/nu(5)/nu(6) Triad of CH(3)D.
High-resolution Fourier transform infrared spectrum of CH(3)D has been recorded in the region of the fundamental bands nu(3), nu(5), and nu(6) 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 (v(3) = 1), (v(5) = 1), and (v(6) = 1) allowed the theoretical description of numerous effects and peculiarities in the spectrum. In particular, sets of a(1)/a(2) 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. Copyright 2000 Academic Press.
Ulenikov
ON
Laboratory of Molecular Spectroscopy, Tomsk State University, Tomsk, 634050, Russia
Onopenko
GA
Tyabaeva
NE
Schroderus
J
Alanko
S