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Atomic Cu, Ag, Cd, and Fe are produced by bombarding the appropriate metal with positive ions from a microwave discharge. The process is similar to sputtering. The metal atoms are trapped in an inert-gas matrix on a cold window and their uv spectra observed. This is a new method for isolating high-melting materials in a matrix for spectroscopic study.
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Shirk et al. (1968) studied this question.
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