Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 390-91, Issue -, Pages 681-684Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2009.01.187
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Beryllium deuteride has been measured in plasma-exposed surfaces and in the plasma column of the PISCES-B experiment. XPS measurements of high-purity BeH2 samples, used as standards, confirm the presence of beryllium deuteride in beryllium codeposited material (Be 1s energy of BeH2 bond = 115.0 eV). TDS measurements of high-purity BeD2 samples are used to accurately determine the decomposition temperature of the beryllium deuteride molecule (similar to 540 K). Deuterium release is observed from plasma-exposed beryllium samples and from Be codeposited layers at this temperature. BeD molecular (A-X) band emission is observed in beryllium seeded plasma discharges and during deuterium sputtering measurements of beryllium. Band emission intensities during Be-seeding are used to estimate the photon emission coefficient, , for the band. The value verifies that molecular sputtering of BeD (from beryllium targets saturated with deuterium from the plasma exposure) is a small fraction of the physical sputtering of beryllium atoms. (C) 2009 Elsevier B.V. All rights reserved.
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