@article {712, title = {Formation of the muoniated ethyl radical in the gas phase}, journal = {Physica B-Condensed Matter}, volume = {326}, number = {1-4}, year = {2003}, note = {ISI Document Delivery No.: 643VHTimes Cited: 4Cited Reference Count: 129th International Conference on Munon Spin Rotation, Relaxation and Resonance (MuSR)JUN 03-07, 2002WILLIAMSBURG, VIRGINIA}, month = {Feb}, pages = {72-75}, type = {Proceedings Paper}, abstract = {The precession signals of the muoniated ethyl radical have been studied as a function of ethene pressure in pure ethene, ethene/nitrogen mixtures and ethene/helium mixtures. The purpose was to investigate the kinetics and mechanism of the radical formation process. It is possible to fit the signal amplitudes with a model involving a single reaction step-Mu addition to ethene. However, the rate constant deduced from the model fit is significantly higher than the literature value for a thermal reaction, as determined by direct study of Mu decay in low partial pressures of ethene. The conclusion is that at partial pressures above 1 bar the reaction occurs before the incoming (beam) muons are fully thermalized. (C) 2002 Elsevier Science B.V. All rights reserved.}, keywords = {ethyl, gas phase, MU-SR, muonium, muonium reaction, radical formation}, isbn = {0921-4526}, url = {://000180881600016}, author = {Percival, P. W. and Brodovitch, J. C. and Arseneau, D. J. and Senba, M. and Fleming, Donald G.} } @article {2889, title = {MUONIUM ATOM SPIN-EXCHANGE WITH ALKALI-METAL VAPORS - MU+CS}, journal = {Physical Review A}, volume = {48}, number = {2}, year = {1993}, note = {ISI Document Delivery No.: LQ990Times Cited: 15Cited Reference Count: 77}, month = {Aug}, pages = {1218-1226}, type = {Article}, abstract = {The thermally averaged total electron spin-flip cross sections (sigma(SF)) for Mu-Cs have been measured in a 2 atm N2 moderator at 543, 566, and 643 K using the muon-spin-rotation technique. Within an overall experimental error of +/-15\%, the measured cross sections can be taken as temperature independent, sigma(SF)=39.7+/-6.0 X 10(-16) cm2, though there may be a trend to decreased values at the lower temperatures. This average value is considerably lower than either the early calculated results of Dalgarno and Rudge [Proc. R. Soc. London Ser. A 286, 519 (1965)] or the more recent ones of Cole and Olson [Phys. Rev. A 31, 2137 (1985)] for the corresponding H-Cs collisions, indicating a dramatic isotope effect.}, keywords = {ADDITION-REACTIONS, COLLISIONS, CROSS-SECTIONS, ENERGIES, HYDROGEN-ATOMS, LOW-PRESSURE GASES, MU-SR, RATE CONSTANTS, relaxation, SCATTERING}, isbn = {1050-2947}, url = {://A1993LQ99000046}, author = {Pan, J. J. and Senba, M. and Arseneau, D. J. and Kempton, J. R. and Fleming, Donald G. and Baer, S. and Gonzalez, A. C. and Snooks, R.} }