Waveguide and diode heterodyne measurements with CO2 laser and assignment of the CW FIR laser emission of OCS

Fayt, André; Lahaye, Jg.; Lemaire, J.; Herlemont, F.; Bantegnie, J.G.

doi:10.1016/0022-2852(90)90138-g

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…This can arise from less than optimal setting of the grating, DC offsets in the servo signal, and drifts in the offset that occur after initially zeroing out such errors. Based on some locking studies, we think this could be as high as 10 kHz for The OCS observed frequency is given by the sum of the C0 2 laser frequencies and the beat frequency.…”

Section: Resulting Heterodyne Frequency Measurementsmentioning

confidence: 98%

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Sub-doppler frequency measurements on OCS at 87 THz (3.4 *m) with the CO overtone Laser:

Dax¹,

Wells²,

Hollberg³

et al. 1994

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We have investigated two techniques for making sub-Doppler frequency measurements with the CO overtone laser. We studied three OCS transitions whose frequencies overlap either directly with CO Av = 2 overtone transition frequencies or with the overtone lines after they have been shifted by an acousto-optic modulator. We have investigated both conventional saturated-absorption and an optical heterodyne polarization. While we eventually used the latter technique for our measurements, it is too cumbersome to use as a conventional laser stabilization tool. Saturation absorption is considerably simpler and has potential for a more accurate measurement, if some technical problems are overcome. This becomes more important in the light of a potential use of the CO Av=2 P 26 (9) transition in a new frequency chain. This transition was used for the OCS P(27) 10°l-00°0 measurement. Polarization spectroscopic techniques with optical heterodyne detection were used to observe the features and then to provide the discriminant for locking the overtone laser to the OCS transitions. A C0 2 laser synthesizer was used for the frequency measurement basis. The new frequencies (uncertainties in parentheses) resulting from the measurements are for the OCS 10°l-00°0 P(27), 87 117 278.492(50) MHz; OCS ll'l-OFO R(14), 87 222 001.143(70) MHz; and for the OC^S 10°1-00°0 P(9), 87 010 586.671(75) MHz.

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Section: Resulting Heterodyne Frequency Measurementsmentioning

confidence: 98%

“…With the exception of some measurements on CO [8] and N 2 [9], our measurements between 1979 and 1990 were all Doppler-limited. In a separate effort, Fayt et al [10] have made sub-Doppler measurements on those OCS transitions that are near the 9 /xm C0 2 laser transitions.…”

mentioning

confidence: 99%

Sub-doppler frequency measurements on OCS at 87 THz (3.4 *m) with the CO overtone Laser:

Dax¹,

Wells²,

Hollberg³

et al. 1994

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“…Transmission spectra were calibrated using OCS lines. 11 Locating subband series in the dense rotational structure in bands of TFEA was greatly aided by use of the LW program developed in Giessen. 12 We were gratified that this program, which was written for use with linear, quasi-linear, and nearprolate tops, worked so well for the highly asymmetric tops of TFEA and its isotopomers.…”

Section: Methodsmentioning

confidence: 99%

“…Interferograms were zero-filled, and boxcar apodization was used. Transmission spectra were calibrated using OCS lines …”

Section: Methodsmentioning

confidence: 99%

Complete Structure of anti-1,1,2,2-Tetrafluoroethane by High-Resolution Infrared Spectroscopy

Craig

Oertel

et al. 2001

J. Phys. Chem. A

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High-resolution (0.0018 cm -1 ) infrared spectra have been recorded in the CF stretching region for 1,1,2,2tetrafluoroethane and its d 2 and 13 C 2 isotopomers. These bands are sufficiently intense to give useful gasphase spectra at -100 °C in a 3 m cell. For each spectrum the rotational structure of the A/C-type and B-type bands due to the anti rotamer, which is a highly asymmetric rotor with κ ) -0.295, have been analyzed. Rotational constants for a Watson-type Hamiltonian have been fitted for the common ground state of each isotopomer and the separate upper states. A complete structure for the nonpolar anti rotamer has been derived and compared with the structure of the polar gauche rotamer obtained from microwave spectroscopy. The geometric parameters for the anti rotamer are r CH ) 1.087(5) Å, r CC ) 1.511(4) Å, r CF ) 1.359(7) Å, R CCH ) 112.9(3)°, R CCF ) 108.5(6)°, R FCF ) 107.4(6)°, and τ FCCF ) 63.6(12)°. The structural parameters for the two isomers of 1,1,2,2-tetrafluoroethane are compared with recent calculations, and trends in these parameters and those of the rotamers of 1,2-difluoroethane are discussed.

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“…The measured lines were used in a global leastlimited, an effort was made to further improve the accuracy squares fit together with other data to very precisely calculate of the molecular transition frequencies by applying sub-OCS line positions and to determine an improved set of Doppler techniques for calibration measurements during the molecular constants. In this work the calculated OCS transilast years (5,6). tion frequencies could be corrected by up to 1.4 MHz leading The development of a CO laser heterodyne spectrometer to significantly higher precision in this wavelength region.…”

Section: Introductionmentioning

confidence: 99%

Sub-Doppler Heterodyne Frequency Measurements on OCS Near 2900 cm−1Using a CO Overtone Sideband Spectrometer

Frech

Mürtz

Palm

et al. 1998

Journal of Molecular Spectroscopy

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Waveguide and diode heterodyne measurements with CO2 laser and assignment of the CW FIR laser emission of OCS

Cited by 12 publications

References 8 publications

Sub-doppler frequency measurements on OCS at 87 THz (3.4 *m) with the CO overtone Laser:

Sub-doppler frequency measurements on OCS at 87 THz (3.4 *m) with the CO overtone Laser:

Complete Structure of anti-1,1,2,2-Tetrafluoroethane by High-Resolution Infrared Spectroscopy

Sub-Doppler Heterodyne Frequency Measurements on OCS Near 2900 cm−1Using a CO Overtone Sideband Spectrometer

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