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Thermal desorption spectra of the oxidized surfaces of diamond powders

✍ Scribed by S Matsumoto; H Kanda; Y Sato; N Setaka

Publisher: Elsevier Science
Year: 1977
Tongue: English
Weight: 425 KB
Volume: 15
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(77)90034-3

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✦ Synopsis

Thermal desorption mass spectrometry was carried out in the range from room temperature to 960°C for the diamond powders oxidized in 10-2Torr 0, at temperatures from 25 to SSCC. The spectra show two desorption peaks (a., p) and the major peak (I seems to consist of at least four types of adsorption states (a, -a.,). The first state a, may arise from "labile" carbon atoms created during degassing, and disappears with high temperature oxidation changing into the more stable states (a? -q). IR absorption spectroscopy shows that (Ye -a4 states include carbonyl and ether structures. The minor peak /3 shows little change with oxidation temperature. The amount of oxygen chemisorbcd at 420°C (1.22 x 10'5atom/cm2) is in good agreement with the estimated value of full coverage.

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