Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..gecowp702n&link_type=abstract
American Physical Society, 51st Annual Gaseous Electronics Conference & 4th International Conference on Reactive Plasmas October
Astronomy and Astrophysics
Astronomy
Scientific paper
The atomic oxygen emissions from astronomical sources provide valuable (perhaps unique) information on densities, gas dynamics, etc. of the atmospheres of the planets and their satellites. For example, the atomic oxygen resonance transition at 130.4 nm is a prominent emission feature in the vacuum ultraviolet spectrum of the Earth's aurora and day glow as well as the atmospheres of Europa, Ganymede, Mars and Venus. In this poster we present our measurements of the electron impact emission cross sections of the 130.4 nm atomic oxygen feature from threshold to 1000 eV impact energy. A high density atomic oxygen beam, created by a microwave discharge source, was intersected at right angles by a magnetically focused electron beam. The experimental apparatus consists of an electron impact collision chamber in tandem with a 0.2m UV spectrometer equipped with a CsI coated channel electron multiplier detector. Emitted photons corresponding to radiative decay of collisionally excited state of the 130.4 nm atomic oxygen feature were detected.
James Geoffrey K.
Kanik Inanc
Khakoo M. A.
Noren C.
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