New evidence for resonant-transfer-and-excitation for /sub 16/S, /sub 20/Ca, and /sub 23/V ions colliding with helium
Conference
·
OSTI ID:6262652
Significant new evidence is presented for resonant-transfer-and-excitation (RTE) in ion-atom collisions. This process occurs when a target electron is captured simultaneously with excitation of the projectile followed by deexcitation via photon emission. RTE, which is analogous to dielectronic recombination (DR), proceeds via an inverse Auger transition, and is expected to be resonant for projectile velocities corresponding to the energy of the ejected electron in the Auger process. Cross sections for projectile K x-ray emission coincident with single electron capture have been measured for 70 to 160 MeV /sub 16/S/sup 13 +/, 100 to 360 MeV /sub 20/Ca/sup 16 +/ /sup 17 +/ /sup 18 +/ and 180 to 460 MeV /sub 23/V/sup 19 +/ /sup 20 +/ /sup 21 +/ ions colliding with helium. Strong resonant behavior, in agreement with theoretical calculations of RTE, is observed as a function of beam energy in the measured cross sections. For Ca and V ions two maxima are observed in the energy dependence of the measured coincidence cross sections. Theoretical calculations show that these maxima are correlated to two groups of intermediate resonant states in the RTE process for which the excited and captured electrons occupy levels with principal quantum numbers n = 2,2 and n = 2, greater than or equal to 3. 13 references, 6 figures.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA); Western Michigan Univ., Kalamazoo (USA). Dept. of Physics; New Univ. of Ulster, Coleraine (UK). Dept. of Physics; North Carolina Univ., Chapel Hill (USA). Dept. of Physics; Missouri Univ., Rolla (USA). Dept. of Physics; Wesleyan Univ., Middletown, CT (USA). Dept. of Physics
- DOE Contract Number:
- AC02-83ER13116; AC02-76CH00016
- OSTI ID:
- 6262652
- Report Number(s):
- BNL-35562; CONF-840829-5; ON: DE85005122
- Country of Publication:
- United States
- Language:
- English
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Technical Report
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Sat Dec 31 23:00:00 EST 1983
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Resonant-transfer-and-excitation for highly charged ions (16 less than or equal to Z less than or equal to 23) in collisions with helium. [70-500 MeV S/sup 13 +/, Ca/sup 18 +/, V/sup 21 +/]
Conference
·
Sat Dec 31 23:00:00 EST 1983
·
OSTI ID:5860398
Correlated charge changing interactions and K x-ray emission in ion-atom collisions. Progress report, August 15, 1983-March 15, 1984
Technical Report
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Wed Feb 29 23:00:00 EST 1984
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OSTI ID:5007070
Related Subjects
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CALCIUM IONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DATA
ELEMENTS
EMISSION
ENERGY RANGE
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
FLUIDS
GASES
HELIUM
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MULTICHARGED IONS
NONMETALS
NUMERICAL DATA
PHOTON EMISSION
RARE GASES
RESONANCE
SULFUR IONS
VANADIUM IONS
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CALCIUM IONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DATA
ELEMENTS
EMISSION
ENERGY RANGE
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
FLUIDS
GASES
HELIUM
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MULTICHARGED IONS
NONMETALS
NUMERICAL DATA
PHOTON EMISSION
RARE GASES
RESONANCE
SULFUR IONS
VANADIUM IONS