Interaction of muonium with oxygen on silica powder surfaces

J. R. Kempton; R. F. Marzke; D. G. Fleming; A. C. Gonzalez; S. K. Leung; J. J. Pan; P. W. Percival; M. Senba; A. Tempelmann

doi:10.1007/BF02397732

Interaction of muonium with oxygen on silica powder surfaces

J. R. Kempton, R. F. Marzke, D. G. Fleming, A. C. Gonzalez, S. K. Leung, J. J. Pan, P. W. Percival, M. Senba, A. Tempelmann

Physics

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Abstract

Results of the first μSR 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 μs^-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 constants at 300 K of 3.1(3)×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.

Original language	English (US)
Pages (from-to)	811-817
Number of pages	7
Journal	Hyperfine Interactions
Volume	65
Issue number	1-4
DOIs	https://doi.org/10.1007/BF02397732
State	Published - Feb 1991

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Nuclear and High Energy Physics
Condensed Matter Physics
Physical and Theoretical Chemistry

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10.1007/BF02397732

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@article{23ce7d80597641d5995bdd886d9169b7,

title = "Interaction of muonium with oxygen on silica powder surfaces",

abstract = "Results of the first μSR 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 μs-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 constants at 300 K of 3.1(3)×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.",

author = "Kempton, {J. R.} and Marzke, {R. F.} and Fleming, {D. G.} and Gonzalez, {A. C.} and Leung, {S. K.} and Pan, {J. J.} and Percival, {P. W.} and M. Senba and A. Tempelmann",

year = "1991",

month = feb,

doi = "10.1007/BF02397732",

language = "English (US)",

volume = "65",

pages = "811--817",

journal = "Hyperfine Interactions",

issn = "0304-3843",

publisher = "Springer Netherlands",

number = "1-4",

}

TY - JOUR

T1 - Interaction of muonium with oxygen on silica powder surfaces

AU - Kempton, J. R.

AU - Marzke, R. F.

AU - Fleming, D. G.

AU - Gonzalez, A. C.

AU - Leung, S. K.

AU - Pan, J. J.

AU - Percival, P. W.

AU - Senba, M.

AU - Tempelmann, A.

PY - 1991/2

Y1 - 1991/2

N2 - Results of the first μSR 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 μs-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 constants at 300 K of 3.1(3)×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.

AB - Results of the first μSR 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 μs-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 constants at 300 K of 3.1(3)×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.

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DO - 10.1007/BF02397732

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SP - 811

EP - 817

JO - Hyperfine Interactions

JF - Hyperfine Interactions

IS - 1-4

ER -

Interaction of muonium with oxygen on silica powder surfaces

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