Production of high-q ions by laser bombardment method
The expanding plasma produced when an intense pulse of laser radiation is focused in vacuum onto a solid target has been used as a source of highly stripped ions for collision cross-section measurements. Usable fluxes of carbon nuclei at energies of a few hundred eV/charge have been obtained by irradiation of graphite with pulses of CO/sub 2/ laser radiation at a focused power density of 3 x 10/sup 10/ W/cm/sup 2/. Bombardment of aluminum and iron targets at comparable power levels have yielded ions of maximum charges of 9 and 16 respectively. A time-of-flight apparatus has been constructed to utilize the laser source for measurement of electron capture cross sections for highly stripped ions in gases at energies in the few hundred eV/charge range. Apertures collimate an ion beam from the plasma blowoff, and an electrostatic analyzer selects ions from the expanding plasma which have the same energy per charge. The beam is directed through a gas target cell, charge anlyzed once more by deceleration, and detected by a channel plate electron multiplier used in a current amplification mode. Electron capture cross sections have been measured for C/sup +q/ ions, q = 3, 4, 5 in H/sub 2/ at energies ranging from 150 to 1160 eV/charge. Prelimiary data have been obtained for carbon ions in atomic hydrogen, and similar measurements are planned for 0/sup +q/ and Fe/sup +q/ ions.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6158658
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Vol. NS-28:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
CARBON IONS
ION SOURCES
ION-MOLECULE COLLISIONS
HYDROGEN
CARBON DIOXIDE LASERS
CROSS SECTIONS
ELECTRON CAPTURE
EXPERIMENTAL DATA
GRAPHITE
LASERS
MULTICHARGED IONS
PHOTON COLLISIONS
CAPTURE
CARBON
CHARGED PARTICLES
COLLISIONS
DATA
ELEMENTAL MINERALS
ELEMENTS
GAS LASERS
INFORMATION
ION COLLISIONS
IONS
MINERALS
MOLECULE COLLISIONS
NONMETALS
NUMERICAL DATA
640301* - Atomic
Molecular & Chemical Physics- Beams & their Reactions
640304 - Atomic
Molecular & Chemical Physics- Collision Phenomena