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Optical spectroscopy of homonuclear ion-atom collisions. Ne/sup +/ + Ne

Journal Article · · Phys. Rev., A; (United States)
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Inelastic collisional processes of the Ne/sup +/ + Ne system have been examined by studying the emission of spectral lines in the range between 360 and 7200 A at impact energies from 30 eV to 7 keV. Thresholds and emission cross sections for lines which originate from several excited configurations have been determined for both Ne I (2p/sup 5/3s, 2p/sup 5/3p) and Ne II (2p/sup 4/3s, 2p/sup 4/3p). The production of Ne I lines is primarily the result of single-electron excitation, and the most strongly excited configuration is 2p/sup 5/3s. The threshold for this reaction, 23.5 +- 1 eV, is in excellent agreement with theoretical calculations. The apparent dominance of excitation of the 2p/sup 5/3s configuration differs from the results observed by measuring the energy loss of scattered ions. It is suggested that this difference may be due to disparities in the cross sections for direct excitation and for charge exchange into excited states. Excitation of Ne II seems to occur in two-electron processes with simultaneous ionization of the target atoms. Low-intensity lines of Ne III are also observed. (AIP)

Research Organization:
Department of Physics, University of Florida, Gainesville, Florida 32601
OSTI ID:
7354622
Journal Information:
Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 13:6; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
ELEMENTS
EMISSION SPECTRA
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
EXCITATION
EXCITED STATES
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
KEV RANGE
KEV RANGE 01-10
NEON
NEON IONS
NONMETALS
RARE GASES
SPECTRA