Production and analysis of lithium ion beams in the low electron volt region.
Abstract
A lithium ion source capable of delivering low energy,
monoenergetic beams of rectangular cross section, has been
developed for use in the study of low-energy atomic, ionic, and
molecular impact phenomena. An analysis of the spatial and energy
distribution of the ion beams extracted from the source was made
over the range of ion energies from 1.2 ev. to 100 ev, with particular
attention given to beams with energies less than 25 ev. The experimental
equipment and procedures are described. For the beams of
low energy the intensity of the beam was limited by the space charge.
The beam intensity in this space charge limited condition was
approximately one third of the theoretical limit. Total beam
—8
intensities ranged from a few times 10" amps at the lowest energies
to a few times 10" amps at the higher energies with corresponding
energy spreads of 1 .1 eV to * 0*3 eV. Typical beam dimensions
are 1.0 cm by 2.0 cm at a distance of 5.0 cm from the gun with an
aperture 0.47 cm by 1.5 cm.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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