✦ LIBER ✦

The interaction of strongly adsorbed oxygen with free spin centers in carbon

✍ Scribed by K Antonowicz

Publisher: Elsevier Science
Year: 1964
Tongue: English
Weight: 375 KB
Volume: 1
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(64)90064-8

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✦ Synopsis

Using paramagnetic resonance technique the interaction of oxygen with free spin centers in carbon was studied. Experiments were performed in which an increase in spin absorption intensity was observed at room temperature in carbonized sugar (1000°C) after admission of oxygen. It was ascertained that this increase is real and not due to a change in line shape or saturation effect. Strongly adsorbed oxygen seems to be responsible for this effect since the increase is reversible; outgassing the sample at 700°C bringing back the line intensity to the original value. The increase in intensity is roughly proportional to the initial spin concentration. A number of various experiments was carried out to clarify the nature of this new oxygen effect.

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