Laboratory Experiments Related to the Dayglows of the CO2 Planets

Details Laboratory Experiments Related to the Dayglows of the CO2 Planets Laboratory Experiments Related to the Dayglows of the CO2 Planets

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.5406s&link_type=abstract

American Astronomical Society, DPS meeting #40, #54.06; Bulletin of the American Astronomical Society, Vol. 40, p.497

Astronomy and Astrophysics

Astronomy

Scientific paper

Spectra of the UV dayglow of Mars were first obtained by the Mariner probes in the 1960's, and only with ESA's Mars Express mission has this topic been revisited. The UV dayglow at 190-300 nm is composed of the CO(a-X) Cameron bands, the CO2+(B-X) 0-0 band, and the 297.2 nm O(1S-3P) line. Due to strong solar scattering from the cloud deck, analogous observations from Venus Express have not yet been successful, although the same emissions are expected, with higher intensity. From the Mariner spectra, it was determined [Conway, 1981] that the Cameron bands have an extremely high rotational temperature] - several thousand K - and our analysis of the Mars Express spectra leads to the same conclusion.
In the visible spectral region, there are no dayglow observations of any kind, but laboratory experiments on EUV photodissociation of CO2 can be used to deduce what will be seen when spectra become available, at least in relation to that fraction of the emissions originating with photoabsorption. The principal visible dayglow emission will be composed of the 7-8.5 eV CO(d-a, a'-a) band systems. Laboratory experiments dating back more than three decades [Judge and Lee, 1973] show that these visible cascading CO systems represent a substantial fractional source of the total Cameron band intensity. The emissions extend into the IR, with intensity peaking at the CO(a'-a) 2-0 Asundi band at 1.08 microns. The results of experiments on the 12-14 eV photodissociation of CO2 at the Advanced Light Source (ALS) will be presented, as will relevant experiments in flow discharges [Burke et al., 1996]. This research was supported by the NASA Outer Planets program.
Burke, M.L. et al. J. Phys. Chem. 100, 138, 1996.
Conway, R.R., J. Geophys. Res. 86, 4767, 1981.
Judge, D.L. and L.C. Lee, J. Chem. Phys. 58, 104, 1973.

Affiliated with

Also associated with

No associations

Rating

Laboratory Experiments Related to the Dayglows of the CO2 Planets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Laboratory Experiments Related to the Dayglows of the CO2 Planets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laboratory Experiments Related to the Dayglows of the CO2 Planets will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1439449