100 eV Electron Impact Ionization of Atomic Oxygen: First Experimental Results

Details 100 eV Electron Impact Ionization of Atomic Oxygen: First Experimental Results 100 eV Electron Impact Ionization of Atomic Oxygen: First Experimental Results

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..gecjtp109d&link_type=abstract

American Physical Society, Gaseous Electronics Conference, October 5-9, 1997, abstract #JTP.109

Astronomy and Astrophysics

Astrophysics

Scientific paper

The study of the ionization of atomic oxygen is of interest both because of the open shell electronic structure of the atom and the importance of atomic oxygen in the atmospheres of planets and astrophysical objects. The (e,2e) method allows the triple differential cross section for production of each of the three final states of the OII ion to be determined. The ionization potentials of atomic oxygen are 13.55 eV (^4S ), 16.86 eV (^2D), and 18.54 eV (^2P). We have recently begun experiments in which a microwave discharge atomic oxygen source is coupled to the (e,2e) spectrometer which we have previously used to study asymmetric (e,2e) processes in N2 and O_2. We are currently using an incident energy of 100 eV and detecting ejected secondary electrons at energies 2.5 - 12.5 eV, and ejection angles 30-120^o. The typical primary electron scattering angle is 4 deg. All three final states of OII are detected in the coincidence energy loss spectrum. Improvements to the apparatus which will allow the absolute triple differential cross sections for ionization of atomic oxygen to be measured by comparing relative cross sections for all three states to the well-measured ionization cross section of argon will be discussed.

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