I. Mukhopadhyay, M. Mollabashi, and R. M. Lees, "High-resolution spectroscopy of methanol-D3: assignments and predictions of optically pumped far-infrared laser lines," J. Opt. Soc. Am. B 14, 2227-2237 (1997)
The results of high-resolution Fourier-transform infrared and far-infrared spectroscopic studies have been applied to the analysis and prediction of optically pumped far-infrared laser emission for 11 transition systems of the isotopomer of methanol. The assignments are supported by the formation of closed transition combination loops that confirm the spectroscopic assignments and yield calculated far-infrared laser wave numbers to the spectroscopic accuracy of order This represents a substantial improvement over customary wavelength measurements. Four of the systems involve the strong asymmetry mixing known to occur between and
levels, which is discussed and partially analyzed. Several inconsistencies are noted between previous proposed assignments in the literature, which were based primarily on calculated energies and infrared wave numbers, and our new spectroscopic data.
Li-Hong Xu, R. M. Lees, E. C. C. Vasconcellos, L. R. Zink, K. M. Evenson, S. C. Zerbetto, and Adriana Predoi J. Opt. Soc. Am. B 12(12) 2352-2359 (1995)
A. Bertolini, G. Carelli, J. C. S. Moraes, A. Moretti, F. Strumia, E. M. Telles, A. Scalabrin, and D. Pereira J. Opt. Soc. Am. B 14(11) 2800-2803 (1997)
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FIR transitions are in the C–O stretching state, with the exception of the first pumped system, which involves the upper levels of the Fermi-hybridized doublets discussed in Refs. 5-7. Bracketed transitions are predicted.
References to original observations are given in the reviews of Refs. 2 and 3.
Assignment references listed with an x are inconsistent with our spectroscopic data.
Derived from the wavelength of 41.5 µm reported in Ref. 20.
Calculated from combination differences.
Approximate wave number from extrapolation of the subband, which may be shifted by a perturbation for
Owing to asymmetry splitting, these predicted FIR lines should be close doublets with ∼0.002- separation.
Table 2
IR and FIR Spectroscopic Data for FIR Laser Assignments and Predictions Involving States with Strong Asymmetry Interactions and Mixing
Asterisks indicate overlapped lines of reduced accuracy. Wave numbers in brackets are calculated from energies derived in the ground-state global fit of Xu and Walsh (Ref. 14).
Table 3
Spectroscopic Data for FIR Laser Transition Systems in
An asterisk denotes an overlapped line of reduced wave-number accuracy.
Calculated from combination differences.
Approximate wave numbers from extrapolation of the subband, which may be shifted by a perturbation for
These transitions are close doublets with small, unresolved splittings.
Derived from the calculated ground-state energies of Xu and Walsh (Ref. 14).
Microwave frequencies for these -branch ground-state transitions were reported in Ref. 12, but with incorrect values. The true values are 2 higher than listed in Ref. 12.
Tables (3)
Table 1
Assignments, Confirmations, and Predictions for Optically Pumped FIR Laser Lines in
FIR transitions are in the C–O stretching state, with the exception of the first pumped system, which involves the upper levels of the Fermi-hybridized doublets discussed in Refs. 5-7. Bracketed transitions are predicted.
References to original observations are given in the reviews of Refs. 2 and 3.
Assignment references listed with an x are inconsistent with our spectroscopic data.
Derived from the wavelength of 41.5 µm reported in Ref. 20.
Calculated from combination differences.
Approximate wave number from extrapolation of the subband, which may be shifted by a perturbation for
Owing to asymmetry splitting, these predicted FIR lines should be close doublets with ∼0.002- separation.
Table 2
IR and FIR Spectroscopic Data for FIR Laser Assignments and Predictions Involving States with Strong Asymmetry Interactions and Mixing
Asterisks indicate overlapped lines of reduced accuracy. Wave numbers in brackets are calculated from energies derived in the ground-state global fit of Xu and Walsh (Ref. 14).
Table 3
Spectroscopic Data for FIR Laser Transition Systems in
An asterisk denotes an overlapped line of reduced wave-number accuracy.
Calculated from combination differences.
Approximate wave numbers from extrapolation of the subband, which may be shifted by a perturbation for
These transitions are close doublets with small, unresolved splittings.
Derived from the calculated ground-state energies of Xu and Walsh (Ref. 14).
Microwave frequencies for these -branch ground-state transitions were reported in Ref. 12, but with incorrect values. The true values are 2 higher than listed in Ref. 12.
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