Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 121, Issue 13, Pages 6334-6340Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1789133
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Exact variational calculations of vibrational energies of CH4 and CH3D are carried out using a two-layer Lanczos algorithm based on the ab initio potential energy surface of D. W. Schwenke and H. Partridge, Spectrochim. Acta, Part A 57, 887 (2001). The convergence of the calculated vibrational energies is discussed in detail. In addition, we report all well converged vibrational energy levels up to 6600 cm(-1) for CH4, and those up to 5000 cm(-1) for CH3D, respectively. These results clearly outperform previous theoretical calculations. And a comparison with experimental results available is also made. (C) 2004 American Institute of Physics.
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