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Confirmation of far infrared laser assignments from CH3-deformation and CH3-rocking states of optically pumped methanol (1988)

Mukhopadhyay, I. ; Lees, R. M. ; Johns, J. W. C.

Springer

Applied physics 47 (1988), S. 319-324

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ISSN: 1432-0649

Keywords: 33.20E ; 42.55H

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract High-resolution Fourier transform spectroscopy has been applied to confirm previously proposed assignments for nine far infrared (FIR) laser lines from the CH3-deformation state of CH3OH and one line from the CH3-rocking state. Accurate frequencies are deduced for the observed and other predicted FIR laser transitions. FIR torsional branch frequencies in the ground state which were used in the confirmation are presented. Comments are also made on the OH-bending mode of CH3OH.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00716093

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Far infrared spectrum of methylamine (1987)

Malghani, M. S. ; Lees, R. M. ; Johns, J. W. C.

Springer

International journal of infrared and millimeter waves 8 (1987), S. 803-825

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ISSN: 1572-9559

Keywords: far-infrared (FIR) spectroscopy ; methylamine ; torsion ; inversion ; large-amplitude motions

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The far-infrared (FIR) spectrum of CH3NH2 has been studied in the 25–125 cm−1 region at a resolution of 0.005 cm−1 with a BOMEM Fourier transform spectrometer. All of therR branches with K rotational quantum number from 5 to 13 have been identified for A-a and E-a torsion-inversion symmetries in the ground torsional state, as well as some branches of A-s and E-s symmetries and some in excited torsional states. The observed branches have been fitted to series expansions in order to determine the branch origins.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01010722

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Torsional refilling transitions in tea-pumped CH3OH fir lasers with associated high-resolution fir spectra (1987)

Mukhopadhyay, I. ; Lees, R. M. ; Johns, J. W. C.

Springer

International journal of infrared and millimeter waves 8 (1987), S. 1471-1482

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ISSN: 1572-9559

Keywords: Far-infrared (FIR) lasers ; methanol ; torsion ; FIR spectra

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract It is proposed that a number of the high-frequency far-infrared (FIR) laser lines observed when CH3OH is optically pumped by high-power CO2 TEA lasers can be identified as refilling torsional transitions within the vibrational ground state. Assignments are presented for 8 such TEA-pump/FIR-laser refilling systems. To provide support for the assigned laser frequencies, high-resolution Fourier transform FIR spectra of CH3OH have been obtained and partially analyzed in the torsional transition region.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01117773

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Applications of high resolution spectroscopy to the identification of far-infrared laser emission from optically pumped13CH3OH (1987)

Mukhopadhyay, I. ; Lees, R. M. ; Lewis-Bevan, W. ; [et al.]

Springer

International journal of infrared and millimeter waves 8 (1987), S. 1483-1502

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ISSN: 1572-9559

Keywords: Far-infrared (FIR) lasers ; methanol ; IR and FIR spectra

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract High-resolution infrared (IR) and far infrared (FIR) Fourier transform absorption spectra have been employed to investigate assignments of FIR laser lines reported from optically-pumped13CH3OH. The spectroscopic measurements are used in conjunction with the reported IR pump and FIR laser frequencies to form closed combination loops for several systems, serving to confirm the assignments and in some cases to improve the accuracy of the FIR laser frequencies. Frequency predictions from combination differences are also presented for a number of potential new FIR laser lines.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01117774

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