Formation of H(2p) and H(2s) in Collisions of Protons and Hydrogen Atoms with Hydrogen Molecules.
Research rept. 1 Jul 70-30 Jun 71,
AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS
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Cross sections for emission of Lyman-alpha radiation owing to formation of H2p and H2s in collisions of 5-15 keV protons and hydrogen atoms with molecular hydrogen have been determined. The intensity of Lyman -alpha emitted spontaneously from H2p was measured at 54.7 or 125.3 deg with respect to the projectile beam in an essentially field-free collision chamber with an oxygen-filtered photometer calibrated by reference to previous results for H on Ar. The increase in intensity of Lyman-alpha when an electric field, oriented in the direction of the beam, was applied within the collision chamber has been used to derive separate cross sections for formation of H2s owing to projectile and dissociative excitation. The experimental configuration was designed to minimize the effect of polarization of the light emitted from H2p and H2s. The total cross section for formulation of Hn2 via projectile excitation exceeds that for dissociative excitation in either H or H impact. Author
- Atmospheric Physics
- Physical Chemistry