@article {6826,
	title = {INTERACTION OF MUONIUM WITH OXYGEN ON SILICA POWDER SURFACES},
	journal = {Hyperfine Interactions},
	volume = {65},
	number = {1-4},
	year = {1990},
	note = {ISI Document Delivery No.: EZ856Times Cited: 10Cited Reference Count: 215TH INTERNATIONAL CONF ON MUON SPIN ROTATION RELAXATION AND RESONANCEAPR 09-12, 1990OXFORD, ENGLAND},
	pages = {811-817},
	type = {Proceedings Paper},
	abstract = {Results of the first mu-SR studies using Merck FO Optipur silica powder, which contains paramagnetic impurities at the ppb level and has a surface area of 610 +/- 20 m2/g, are reported. Above 20 K, the transverse field muonium relaxation rate is roughly constant at 0.5 mu-s-1. Upon the addition of oxygen at ppm levels, the relaxation rate increases linearly with O2 concentration in the temperature range from 40-100 K yielding two-dimensional depolarization rate constants on the order of 10(-4) cm2 molecule-1 s-1. As the temperature is increased further, both oxygen and muonium desorb from the surface yielding a three-dimensional rate constant at 300 K of 3.1(3) x 10-10(-10) cm3 molecule-1 s-1, in agreement with the gas phase value. Longitudinal field measurements suggest that MuO2 is formed and is able to spin exchange with other oxygen molecules.},
	keywords = {TEMPERATURE},
	isbn = {0304-3843},
	url = {<Go to ISI>://A1990EZ85600009},
	author = {Kempton, J. R. and Marzke, R. F. and Fleming, Donald G. and Gonzalez, A. C. and Leung, S. K. and Pan, J. J. and Percival, P. W. and Senba, M. and Tempelmann, A.}
}
