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Titolo:
High-temperature, high-resolution photoabsorption cross sections of O-2 inthe 108.5-nm region
Autore:
Wu, CYR; Hung, T; Judge, DL; Matsui, T;
Indirizzi:
Univ So Calif, Ctr Space Sci, Los Angeles, CA 90089 USA Univ So Calif LosAngeles CA USA 90089 ace Sci, Los Angeles, CA 90089 USA Univ So Calif, Dept Phys & Astron, Los Angeles, CA 90089 USA Univ So Calif Los Angeles CA USA 90089 Astron, Los Angeles, CA 90089 USA Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima 7398526, Japan Hiroshima Univ Higashihiroshima Japan 7398526 hihiroshima 7398526, Japan
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A4, volume: 106, anno: 2001,
pagine: 5599 - 5603
SICI:
0148-0227(20010401)106:A4<5599:HHPCSO>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
OPTICAL OSCILLATOR-STRENGTHS; 83.4 NM; PHOTOIONIZATION; ABSORPTION; SPECTROSCOPY; N2; THRESHOLD; NITROGEN; OXYGEN; CO2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Wu, CYR Univ So Calif, Ctr Space Sci, Stauffer Hall Sci 274, Los Angeles, CA 90089USA Univ So Calif Stauffer Hall Sci 274 Los Angeles CA USA 90089 89USA
Citazione:
C.Y.R. Wu et al., "High-temperature, high-resolution photoabsorption cross sections of O-2 inthe 108.5-nm region", J GEO R-S P, 106(A4), 2001, pp. 5599-5603

Abstract

The high-resolution absorption cross-section measurements of O-2 in the 108.0-to 108.7-nm spectral region have been carried out with a resolution of 0.0008 nm and at temperatures of 295 and 535 K. The absorption features in this spectral region exhibit primarily a blue-shaded broad band with a bandhead peaked at 108.52 nm. The center of gravity of the diffuse band is located at 108.452 nm. The present room temperature cross-section data of the N-II 108.5-nm sextuplets agree well with the unpublished data of J.A.R. Samson (private communication, 1990). As the temperature increases from 295 to535 K, we observe a decrease in cross-section values by as much as 30% over the contour of the diffuse band. Similarly, the cross-section values of the sharp features decrease as temperature increases. The N-II 108.5-nm multiplets are one of the prominent emissions in the Earth's airglow. The EUV-UV dayglow limb scans of the thermosphere and ionosphere have currently beengathered by satellite, e.g., ARGOS, at a tangent ray height of 200 km, above where the ambient absorption due to O-2 and N-2 is expected. The presenttemperature-dependent cross sections of O-2 provide the important databaserequired for modeling the dayglow observations.

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Documento generato il 19/09/20 alle ore 21:58:40