Abstract
The torsion-rotation structure of the far-infrared (FIR) spectrum of the C-13 isotopic species of methyl alcohol has been investigated by high-resolution Fourier transform spectroscopy in the 25–350 cm−1 region, with emphasis on subbands involving excited torsional states. In this study, 89 such subbands have been identified, with torsional states fromn=1 ton=3 included. As well, a further 4 assignments have been added to our previous work on then=0 ground torsional state. The subband origins together with known microwave results have been fitted by least-squares to our torsion-rotation Hamiltonian, and improved molecular structural and torsional constants for the vibrational ground state are reported. Tables of state-specific constants representing the three leading terms in aJ(J+1) power-series expansion of the torsion-rotation energy levels are given for torsional statesn=0 to 3 and rotationalK values from 0 to 16.
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References
S.S. Haque, R.M. Lees, J.M. Saint-Clair, Y. Beers, and D.R. Johnson, “Microwave Spectrum of13C Methanol,”Astrophys. J. 187, L15-L17 (1974).
H. Kuriyama, K. Takagi, H. Takeo, and C. Matsumura, “Laboratory Microwave Spectrum of13CH3OH,”Astrophys. J. 311, 1073–1075 (1986).
T. Anderson, E. Herbst, and F.C. De Lucia, “The Laboratory Millimeter- and Submillimeter-Wave Spectrum of13C Methanol,”Astrophys. J. Suppl. 64, 703–714 (1987).
T. Anderson, E. Herbst, F.C. De Lucia, K.V.L.N. Sastry, and R.M. Lees, “The Laboratory Millimeter- and Submillimeter-Wave Spectrum of the First Two Excited Torsional States of13CH3OH,”Astrophys. J. Suppl. 68, 821–831 (1988).
T. Anderson, E. Herbst, and F.C. De Lucia, “The Millimeter- and Submillimeter-Wave Spectrum of13CH3OH Revisited,”Astrophys. J. Suppl. 74, 647–664 (1990).
J.O. Henningsen and J.C. Petersen, “Observation and Assignment of Far-Infrared Laser Lines from Optically Pumped13CH3OH,”Infrared Phys. 18, 475–479 (1978).
J.O. Henningsen, J.C. Petersen, F.R. Petersen, D.A. Jennings, and K.M. Evenson, “High Resolution Spectroscopy of Vibrationally Excited13CH3OH by Frequency Measurement of FIR Laser Emission,”J. Mol. Spectrosc. 77, 298–309 (1979).
N. Ioli, A. Moretti, F. Strumia, and F. D'Amato, “13CH3OH and13CD3OH Optically Pumped FIR Laser: New Large Offset Emission and Optoacoustic Spectroscopy,”Int. J. Infrared Millimeter Waves 7, 459–486 (1986).
D. Pereira and A. Scalabrin, “Measurement and Assignment of New FIR Laser Lines in12CH3OH and13CH3OH,”Appl. Phys. B 44, 67–69 (1987).
I. Mukhopadhyay, R.M. Lees, W. Lewis-Bevan, J.W.C. Johns, F. Strumia, and G. Moruzzi, “Applications of High Resolution Spectroscopy to the Identification of Far-Infrared Laser Emission from Optically Pumped13CH3OH,”Int. J. Infrared Millimeter Waves 8, 1483–1502 (1987).
I. Mukhopadhyay, R.M. Lees, and J.W.C. Johns, “High-Resolution Far-Infrared Spectroscopy of C-13 Methanol,”Int. J. Infrared Millimeter Waves 9, 1119–1140 (1988).
G. Carelli, N. Ioli, A. Moretti, G. Moruzzi, D. Pereira, and F. Strumia, “Acoustooptic Extension of the Frequency Tunability of cw CO2 Lasers: New FIR Lasers Emissions from CH3OH and13CH3OH,”Int. J. Infrared Millimeter Waves 12, 449–471 (1991).
J.C. Petersen, “Infrared Radio-Frequency Double Resonance of13CH3OH,”Opt. Lett. 12, 471–473 (1987).
J.C. Petersen, “Infrared-Infrared Double-Resonance Spectra of13CH3OH and12CH3OH,”J. Opt. Soc. Am. B 6, 350–355 (1989).
I. Mukhopadhyay and R.M. Lees, “High-Resolution Spectroscopy of Methanol: Coriolis Resonance and Far Infrared Laser Identification,”Optics Commun. 97, 194–198 (1993).
D. Pereira, F.C. Cruz, J.C.S. Moraes, and A. Scalabrin, “Diode Laser and Fourier Transform Spectroscopy of the13CH3OH C-O Stretching Mode,”Int. J. Infrared Millimeter Waves 15, 417–428 (1994).
I. Mukhopadhyay, R.M. Lees, W. Lewis-Bevan, and J.W.C. Johns, “Fourier Transform Spectroscopy of the CO-Stretching Band of C-13 Methanol in the Torsional Ground State,”J. Chem. Phys., in press.
G.A. Blake, E.C. Sutton, C.R. Masson, T.G. Phillips, E. Herbst, G.M. Plummer, and F.C. De Lucia, “13CH3OH in OMC-1,”Astrophys. J. 286, 586–590 (1984).
E.C. Sutton and E. Herbst, “Identification of Interstellar Methanol Lines,”Astrophys. J. 333, 359–365 (1988).
R.M. Lees and J.G. Baker, “Torsion-Vibration-Rotation Interactions in Methanol. I. Millimeter Wave Spectrum,”J. Chem. Phys. 48, 5299–5318 (1968).
Li-Hong Xu and J.T. Hougen, “Global Fit of Rotational Transitions in the Ground Torsional State of Methanol,”J. Mol. Spectrosc., in press.
Adriana Predoi and R.M. Lees, “Fourier Transform Spectroscopy of the In-Plane CH3-Rocking Mode of C-13 Methanol,” ROMOPTO'94, 4th Conference in Optics, September, 1994, Bucharest, Romania.
R.M. Lees, Adriana Predoi, and Li-Hong Xu, “Far Infrared Laser Assignments for CO-Stretching and CH3-Rocking States of Optically Pumped13CH3OH,” ROMOPTO'94, 4th Conference in Optics, September, 1994, Bucharest, Romania.
G. Moruzzi, Li-Hong Xu, R.M. Lees, B.P. Winnewisser and M. Winnewisser, “Investigation of the Ground Vibrational State of CD3OH by a New ‘Ritz’ Program for Direct Energy Level Fitting”,J. Mol. Spectrosc. 167, 156–175 (1994).
R.M. Lees, “Linear Dependence in Least Squares Analysis, with an Application to Internal Rotation,”J. Mol. Spectrosc. 33, 124–136 (1970).
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Mukhopadhyay, I., Lees, R.M. Far-infrared spectrum of excited torsional states of C-13 methanol. Int J Infrared Milli Waves 16, 99–115 (1995). https://doi.org/10.1007/BF02085849
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DOI: https://doi.org/10.1007/BF02085849