A new spectral emission source of rotationally cooled molecular ions. Application to supersonic expansions of CO and CO2 gases

Cossart, D.; Cossart‐Magos, Claudina

doi:10.1016/0009-2614(95)01455-1

Cited by 20 publications

(12 citation statements)

References 24 publications

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“…For example, it could correspond to the O 2 Herzberg I (6,2) band emission resulting from O+O recombination [ Eastes et al , 1992], similar to NO recombination emission [ Bertaux et al , 2005a]. Another possibility is an emission associated with CO + excitation by electron impact ionization/excitation of CO molecules [ Cossart and Cossart‐Magos , 1996].…”

Section: Analysis Of Spicam Uvs Measurementsmentioning

confidence: 99%

Martian dayglow as seen by the SPICAM UV spectrograph on Mars Express

et al. 2006

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[1] In this paper we describe measurements of the Martian dayglow obtained by SPICAM UV spectrograph on board Mars Express between October 2004 and March 2005. Typical spectra (of more than 24,000 individual spectra) display the main features of the dayglow already reported more than 30 years ago (Barth et al., 1971. The variations with altitude, solar zenith angle, and aerocentric longitude of the main emissions, namely, the CO Cameron band emissions (a 3 Å -X 1 S + ) from 180-260 nm, the CO 2 + ultraviolet doublet (B 2 S + -X 2 Å) emission near 289 nm, the O resonance line at 130.4 nm, and the H Lyman alpha line at 121.6 nm, are detailed. The average temperature deduced from the CO 2 + (B 2 S + -X 2 Å) emission scale height between 150 and 190 km is T 1 = 201 ± 10 K. The altitude of the peak of the dayglow emission varies from 120 km at low solar zenith angle ($30°) up to 132 km at high solar zenith angle ($75°). We also find 24 orbits in which the individual derived exospheric temperatures do not show significant variations with respect to solar zenith angle, aerocentric longitude, or longitude. The presence of crustal magnetic fields appears to correlate with a significant ($100 K) increase in exospheric temperature. We report also the first observations of emissions associated with the N 2 Vegard Kaplan band system in the Martian upper atmosphere.

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Section: Analysis Of Spicam Uvs Measurementsmentioning

confidence: 99%

Martian dayglow as seen by the SPICAM UV spectrograph on Mars Express

et al. 2006

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“…There have been reports of possible rotationally resolved fluorescence of CO 2+ at 546.3 nm [22]. However in a more recent paper [23] (v = 1) (using R6G laser dye) were sought but not found.…”

Section: Rotationally Resolved Electronic Spectroscopymentioning

confidence: 99%

Photo double ionization spectra of CO: comparison of theory with experiment

Eland¹,

Hochlaf

King

et al. 2004

J. Phys. B: At. Mol. Opt. Phys.

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High level ab initio calculations have been undertaken of potential energy curves of CO 2+ (and for the CO neutral ground state). The accuracy of the potentials was tested by a synthesis of the available vibrationally resolved threshold photoelectrons in coincidence (TPEsCO) and time of flight, photo electron photo electron coincidence (TOF-PEPECO) spectra of CO 2+ . Good agreement was found between experimental and theoretical spectra once relative energies of the calculated double ionization energies were slightly adjusted (by approximately 1%) to match experiment. Vibrational separations within individual electronic states are very well reproduced (the worst error is 0.07%).

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“…This was carried out, with effusive beams, with Marcel Horani (37,38) and proved to be the starting point of a series of special sources for obtaining the emission spectra of molecular radicals, molecular ions, and intercombination transitions. Daniel Cossart has continued the development of ingenious emission sources, in the same spirit, to this day (39).…”

Section: Back In France: Round About Benzene Benzyl and Some Molecumentioning

confidence: 98%

“…A mutation occurred when we began to apply synchrotron radiation and coincidence techniques to the study of molecular dications. I had been interested in the possibility of observing the optical spectra of molecular dications since the early observations of N 2+ 2 by Kevin Carroll (148), which remained the only known emission spectrum of a dication until Daniel Cossart observed NO 2+ (149) and, very recently, CO 2+ (39,150). The wide range of photon excitation energies available with synchrotron radiation in Orsay made it possible to envisage other types of studies on multiply charged molecular ions.…”

Section: Vuv Photophysics and Photochemistrymentioning

confidence: 99%

IN MY TIME: Scenes of Scientific Life

Leach

1997

Annu. Rev. Phys. Chem.

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[Figure: see text] ▪ Abstract A narrative account of the ingredients in the making of a young scientist, his wartime science in England, and subsequent career in France, where, starting in molecular electronic spectroscopy, he has grown older and has expanded his horizons to address problems of astrophysical, nonlinear optical, and biological interest, using, with the aid of many good scientists, a variety of techniques, mainly of optical and mass spectroscopies and with synchrotron radiation as an important excitation source. He has plans to continue….

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A new spectral emission source of rotationally cooled molecular ions. Application to supersonic expansions of CO and CO2 gases

Cited by 20 publications

References 24 publications

Martian dayglow as seen by the SPICAM UV spectrograph on Mars Express

Martian dayglow as seen by the SPICAM UV spectrograph on Mars Express

Photo double ionization spectra of CO: comparison of theory with experiment

IN MY TIME: Scenes of Scientific Life

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