Far infrared laser lines and assignments of CH3OH: a review

Methyl alcohol is the most important lasing molecule in the Far-Infrared (FIR) spectral region, and the most widely used for investigation and for applications. Since the last critical review of 1984, over seventy papers have been published dealing with the FIR laser lines and the infrared spectroscopy of CH3OH. In 1984 we could list about 330 FIR laser lines, 98 of which were measured in frequency and 105 assigned. Since then more than 70 papers were published increasing the number of the known laser lines to 575 (103 measured in frequency). Also the FIR and IR spectroscopy was largely improved thanks to the analysis of high resolution FT spectra, and the number of the correctly assigned laser lines has been increased to 224. The wavenumbers of the assigned lines can now be predicted with an accuracy of about 0.001 cm−1 or better, thus approaching the accuracy of the experimental frequency measurements.

[1]  J. Henningsen,et al.  Saturated absorption Stark spectroscopy of CH3OH with CO2 lasers , 1986 .

[2]  S. Jacobsson.  Optically pumped far infrared lasers , 1989 .

[3]  P. Mathieu,et al.  Wavelengths for new CH3OH laser lines , 1981 .

[4]  M. Inguscio,et al.  Atlas of CH3OH absorption spectroscopy by using a 395 MHz tunable CO2 waveguide laser , 1984 .

[5]  G. Duxbury,et al.  Submillimetre laser lines from CH3OH pumped by a13C18O2 pump laser: Observations and assignments , 1984 .

[6]  G. Merkle,et al.  IR absorption measurements and new FIR emission lines in CH3OH by use of a frequency-tunable CW waveguide CO2 laser , 1984 .

[7]  J. Heppner,et al.  CW and pulsed FIR-CO2 hybrid laser with improved efficiency and amplitude stability at short FIR wavelengths , 1984 .

[8]  K. Matsushima,et al.  Nonlinear level crossing in the infrared transitions of optically pumped far infrared laser media , 1987 .

[9]  G. Moruzzi,et al.  Acoustooptic extension of the frequency tunability of CW CO2 lasers: New FIR lasers emissions from CH3OH and13CH3OH , 1991 .

[10]  L. Coudert,et al.  The rotation-torsion energy levels of the methanol molecule 12CH3 16OH above the triple potential barrier , 1987 .

[11]  G. Moruzzi,et al.  Pressure shift and broadening in CH3OH: effects relevant to lasing transitions , 1987 .

[12]  G. Moruzzi,et al.  High-resolution FIR and IR spectroscopy of CH3OH , 1984 .

[13]  F. Strumia,et al.  High Power, Tunable Waveguide CO2 Lasers , 1985 .

[14]  A. Scalabrin,et al.  New optically pumped FIR laser lines in CD3OH , 1986 .

[15]  J. Henningsen.  Analysis of torsionally excited CO stretch states in CH3OH , 1983 .

[16]  J. K. Vij,et al.  Some new FIR laser lines of optically pumped 12 CH 3 16 OH, 12 CH 3 16 OD, and 12 CH 3 I, 12 CH 3 Br, 12 CD 2 Cl 2 absorption spectroscopy of water and acetonitrile , 1986 .

[17]  D. Igner,et al.  Infrared-microwave double resonance as an aid in assignment of optically pumped submillimetre laser lines: CH2CF2, CH2F2, and CH3OH , 1983 .

[18]  J. Henningsen,et al.  Torsion-vibration interaction in CH3OH , 1986 .

[19]  M. Inguscio,et al.  Far-Infrared Laser Lines from Optically Pumped CH3OH , 1984 .

[20]  G. Moruzzi,et al.  Intracavity Triple Resonance Spectroscopy in CH3OH FIR Lasers , 1985 .

[21]  M. Inguscio,et al.  Accurate frequency of the 119 mu m methanol laser from tunable far-infrared absorption spectroscopy , 1990 .

[22]  Nigel G. Douglas.  Millimetre and Submillimetre Wavelength Lasers , 1989 .

[23]  Y. Nishi,et al.  Direct observation of the differences between Raman scatering and population inversion transition for their emission frequencies and pulse waveforms , 1987 .

[24]  J. Henningsen.  Observation and assignment of torsional transitions in FIR emission from optically pumped CH3OH , 1983 .

[25]  Iku Nemoto.  Three-dimensional imaging in microscopy as an extension of the theory of two-dimensional imaging , 1988 .

[26]  Massimo Inguscio,et al.  A review of frequency measurements of optically pumped lasers from 0.1 to 8 THz , 1986 .

[27]  J. Petersen,et al.  Infrared–microwave double resonance in methanol: coherent effects and molecular parameters , 1988 .

[28]  Massimo Inguscio,et al.  IR-FIR Transferred lamb-dip spectroscopy in optically pumped molecular lasers , 1979 .

[29]  T. E. Gough,et al.  Transition dipole moment for the C−O stretching band of CH4OH measured with molecular beam laser stark spectroscopy , 1986 .

[30]  F. Colao,et al.  Fourier transform spectroscopy of methanol: Taylor coefficients for the region between 8 and 80 cm -1 , 1985 .

[31]  C. Bonetti,et al.  The Fourier spectrum of CH3OH: The region between 8 and 40 cm−1 , 1984 .

[32]  Y. Nishi.  Assignments of fir laser emissions from CH3OH optically pumped by an intra-cavity etalon tuned TEA-CO2 laser , 1987 .

[33]  J. Henningsen,et al.  A study of the methanol laser with a 500 MHz tunable CO2 pump laser , 1988 .

[34]  M. Allegrini,et al.  Intensities of the CO stretch band of CH3OH at 9.7 μm , 1990 .

[35]  R. Lees,et al.  Torsional refilling transitions in tea-pumped CH3OH fir lasers with associated high-resolution fir spectra , 1987 .

[36]  I. Longo,et al.  Triple-resonance spectroscopy on CH3OH far-infared laser lines. , 1985, Optics letters.

[37]  R. Lees,et al.  Analysis of CH 3 OH far infrared laser lines optically pumped by sequence band and isotopic CO 2 lasers , 1987 .

[38]  G. Moruzzi,et al.  FIR Stark spectroscopy on optically pumped CH3OH laser , 1981 .

[39]  J. Henningsen.  Methanol laser lines from torsionally excited co stretch states, and from OH-bend, CH3-rock, and CH3-deformation states , 1986 .

[40]  R. Lees,et al.  Torsion–Vibration–Rotation Interactions in Methanol. I. Millimeter Wave Spectrum , 1968 .

[41]  G. Moruzzi,et al.  CH3OH laser line assignments and frequency predictions , 1991 .

[42]  M. Inguscio,et al.  Heterodyne of optically pumped fir molecular lasers and direct frequency measurement of new lines , 1986 .

[43]  K. Evenson,et al.  Frequency measurements of far infrared12CH3OH laser lines , 1987 .

[44]  Y. Nishi.  Many FIR Laser Emissions Pumped by a TEA-C02 Laser with Etalon Tuning , 1987 .

[45]  F. Strumia,et al.  New large offset far-infrared laser lines from CD3OH , 1987 .

[46]  P. Bernard,et al.  New CH3OH laser lines pumped with a fine-tuned high-power CO2-TEA laser , 1983 .

[47]  J. Leite,et al.  Methyl alcohol saturation spectroscopy using a CO(2) sequence band laser. , 1985, Optics letters.

[48]  J. Petersen.  Infrared–infrared double-resonance spectra of 13 CH 3 OH and 12 CH 3 OH , 1989 .

[49]  R. Lees,et al.  Identification of the high efficiency 127μm FIR laser line of13CD3OH , 1988 .

[50]  G. Moruzzi,et al.  High resolution spectrum of Ch3OH between 8 and 100cm−1 , 1989 .

[51]  R. Lees,et al.  Confirmation of far infrared laser assignments from CH3-deformation and CH3-rocking states of optically pumped methanol , 1988 .

[52]  Manfred Winnewisser,et al.  The spectrum of CH3OH between 100 and 200 cm−1: Torsional and “forbidden” transitions , 1990 .

[53]  A. Scalabrin,et al.  Measurement and assignment of new FIR laser lines in12CH3OH and13CH3OH , 1987 .

[54]  G. Moruzzi,et al.  Intracavity triple resonance spectroscopy in the CH3OH far-infrared laser , 1984 .

[55]  Y. Nishi,et al.  The shortest wavelength far-infrared laser line from CW CO2 laser pumped CH3OH and M-independent Stark splitting of laser lines , 1983 .

[56]  H. Pickett,et al.  Stable 1.25 watts CW far infrared laser radiation at the 119 μm methanol line , 1987, International Laser Science Conference.

[57]  G. Moruzzi,et al.  The Hanle Effect and Level-Crossing Spectroscopy , 1991 .

[58]  J. Petersen.  Infrared radio-frequency double resonance of (13)CH(3)OH. , 1987, Optics letters.

[59]  R. Lees,et al.  Fourier spectrum of CH3OH between 950 and 1100 cm−1 , 1989 .

[60]  R. Lees.  On the El-E2 Labeling of Energy Levels and the Anomalous Excitation of Interstellar Methanol , 1973 .

[61]  J. Henningsen,et al.  A 500 MHz tunable CO 2 waveguide laser for optical pumping , 1986 .

[62]  G. Duxbury,et al.  Optical-optical double resonance spectra of CH3OH , 1984 .

[63]  P. Bernard,et al.  Intracavity double resonance in the CH3OH submillimeter laser. , 1983, Applied optics.