Temperature and perturber dependences of water-vapor 380 GHz-line broadening

Bauer, A.; Godon, M.; Kheddar, M.; Hartmann, Jean-Michel; Bonamy, J.; Robert, D.

doi:10.1016/0022-4073(87)90056-2

Cited by 65 publications

(17 citation statements)

References 31 publications

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“…usually the ambient one. This law has been widely used and is often stated as empirical, although it has some theoretical justification [95,96] for a simplified potential model. Also, the hard sphere model predicts a constant value of 0.5, whatever the spectral line.…”

Section: Temperature Dependenciesmentioning

confidence: 99%

Line broadening coefficient calculations for methane perturbed by nitrogen

Gabard¹,

Boudon²

2010

Journal of Quantitative Spectroscopy and Radiative Transfer

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We report semiclassical line broadening calculations for methane perturbed by nitrogen at room temperature. For this, we have developed a symmetrized version of the Robert and Bonamy theory. The interaction potential was built from electrostatic (octopole and hexadecapole for methane, quadrupole for nitrogen) and atom-atom contributions. The relative (classical) trajectories of the molecules were computed in the frame of the usual parabolic model, through analytical formula. High orders of developments had to be used for the short range molecular interactions. As a consequence, a combination of symbolic computation and source code generation was employed to implement practical calculations. We have compared our calculations to the most recent experimental data available in the ν 4 band, the ν 3 band and the octad spectral region of methane.

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Section: Temperature Dependenciesmentioning

confidence: 99%

Line broadening coefficient calculations for methane perturbed by nitrogen

Gabard¹,

Boudon²

2010

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…[1][2][3] Because these small, fundamental species have intrinsically interesting collisional properties, their dynamical properties have been studied as well. These studies have ranged from investigations of pressure broadening near room temperature ͑which are fundamental to the deconvolution of atmospheric remote sensing data͒ [4][5][6] to basic studies of the quantum nature of molecular collisions at low temperature. 7,8 Because the strength of the interaction between electromagnetic radiation and molecular rotation peaks sharply in the mm/sub mm region, a variety of spectroscopically based remote sensing applications have grown out of this more basic work.…”

Section: A Applications and Impact Of Millimeter And Submillimeter Smentioning

confidence: 99%

“…It is based on broadband, voltage tunable BWOs produced by the ISTOK Research and Development Company of Fryazino, Moscow Region, Russia and uses very fast sweep (ϳ10 5 Doppler limited spectral resolution elements per second͒ and optical calibration methods to replace the phase and frequency lock techniques more commonly used.…”

Section: A New Spectroscopic System For the Mm/sub MM Spectral Regionmentioning

confidence: 99%

A fast scan submillimeter spectroscopic technique

Petkie¹,

Goyette²,

Bettens³

et al. 1997

Review of Scientific Instruments

149

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A new fast scan submillimeter spectroscopic technique ͑FASSST͒ has been developed which uses a voltage tunable backward wave oscillator ͑BWO͒ as a primary source of radiation, but which uses fast scan (ϳ10 5 Doppler limited resolution elements/s͒ and optical calibration methods rather than the more traditional phase or frequency lock techniques. Among its attributes are ͑1͒ absolute frequency calibration to ϳ1/10 of a Doppler limited gaseous absorption linewidth (Ͻ0.1 MHz, 0.000 003 cm Ϫ1 ), ͑2͒ high sensitivity, and ͑3͒ the ability to measure many thousands of lines/s. Key elements which make this system possible include the excellent short term spectral purity of the broadly (ϳ100 GHz) tunable BWO; a very low noise, rapidly scannable high voltage power supply; fast data acquisition; and software capable of automated calibration and spectral line measurement. In addition to the unique spectroscopic power of the FASSST system, its implementation is simple enough that it has the prospect of impacting a wide range of scientific problems.

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“…O at 183 GHz was studied by Bauer et al (33) and Goyette et al (34), and the 4 1,4 -3 2,1 transition at 380 GHz also by the same groups (35,36). The temperature dependence of the collisional broadening coefficients was analyzed between 100 and 600 K (34,36 (40).…”

mentioning

confidence: 95%