M greater than or equal to 4 hydrocarbon molecules; Observation of two components in molecular cusp spectra for MeV/u H/sup +/, He/sup +/, He/sup + +/ projectiles

Journal Article · Fri Apr 01 04:00:00 EST 1983 · IEEE Trans. Nucl. Sci.; (United States)

DOI:https://doi.org/10.1109/TNS.1983.4332440· OSTI ID:5914146

Bissinger, G; Gaiser, J; Joyce, J M

Recently it has been realized that the cusp spectra obtained with bare projectiles and ''clothed'' projectiles incident on gaseous targets are different in their widths and symmetries due to origin of the electrons in the cusp. For the case of bare projectiles, the electrons in the cusp are those captured from the target to the projectile's continuum, while in the case of the clothed projectiles the dominant contribution to the cusp yield is from projectile electrons that are expelled into the continuum during the collision. The former process is called electron capture to the continuum (ECC), while the latter is called electron loss to the continuum (ELC); together these processes constitute electron transfer to the continuum (ETC). For solid targets, the cusp shape is observed to have a skew opposite to that for gas targets and the width is noticeably less. The characteristics of the ''convoy'' electron cusp have led the University of Tennessee/Oak Ridge National Laboratory group to speculate that convoy electron production is initiated by electron capture to excited states of the projectile, immediately followed by ELC. Also Gladieux and Chateau-Thierry have experimentally observed what appears to be two components in the convoy electron spectra obtained by bombarding 15 microgram/cm/sup 2/ A1 foils with about MeV/u H/sup +/ beams. They attributed the broader component to ECC processes but the narrow component, based on its the width and symmetry properties, was associated with ''wake riding electrons''. The authors report here the results of an investigation of the cusp shapes obtained for varying size hydrocarbon molecule targets bombarded with about MeV/u H/sup +/, He +,++ projectiles. Results also indicate the presence of multiple contributions to the overall cusp shape for the larger molecules.

• Research Organization: East Carolina Univ., Greenville, NC 27834
• OSTI ID: 5914146
• Journal Information: IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. 30:2; ISSN IETNA
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ALUMINIUM
BEAMS
CAPTURE
CATIONS
CHARGED PARTICLES
COLLISIONS
CUSPED GEOMETRIES
ELECTRON CAPTURE
ELECTRON LOSS
ELECTRON TRANSFER
ELEMENTS
FLUIDS
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GASES
HELIUM IONS
HYDROCARBONS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION BEAMS
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
MAGNETIC FIELD CONFIGURATIONS
METALS
MOLECULE COLLISIONS
NATIONAL ORGANIZATIONS
OPEN CONFIGURATIONS
ORGANIC COMPOUNDS
ORNL
PROJECTILES
SHAPE
SOLIDS
SPECTRA
SYMMETRY
TARGETS
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