Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 17: Posters Friday (Spectroscopy)

A 17.1: Poster

Freitag, 6. April 2001, 12:30–15:00, AT3

Electron-impact dissociative excitation of O₂: Kinetic energy distribution of fast oxygen atoms — •Oleg Makarov, Joseph Ajello, Isik Kanik, Craig Noren, and Philip McCartney — Jet Propulsion Laboratory, 4800 Oak Grove Rd., Pasadena CA 91109

The kinetic energy distribution of oxygen atoms resulting from electron-impact dissociation of O₂ has been measured. A high-resolution vacuum ultraviolet spectrometer was employed for the measurement of the O I (115.2, 130.4, 135.6 nm) fine structure emission lines profiles at 35 and 100 eV electron impact energies. The deconvolved line profiles of atomic oxygen reveal the existence of a broad line profile (∼ 30–40 mÅ FWHM) produced from a combination of dissociative excitation and dissociative ionization excitation processes. The atomic oxygen kinetic energy distributions at 100 eV electron impact energy spans the energy range from 1–10 eV with a peak value near 1 eV. The excitation functions of O I (115.2, 130.4, 135.6 nm) were measured in the vicinity of threshold from 14 eV to 50 eV.