@article {7041,
	title = {EPITHERMAL MUONIUM PROCESSES IN METHANE AND PROPANE GASES},
	journal = {Journal of Physical Chemistry},
	volume = {95},
	number = {19},
	year = {1991},
	note = {ISI Document Delivery No.: GG383Times Cited: 7Cited Reference Count: 90},
	month = {Sep},
	pages = {7338-7344},
	type = {Article},
	abstract = {Gas-phase mu-SR studies of dense methane up to 10 mol L-1 and of propane at low densities, up to 0.2 mol L-1, are reported. It is found that the diamagnetic polarization, P(D), increases in both gases with pressure, with a related decrease seen in the muonium polarization, P(Mu). The initial increase seen in P(D) at low densities is attributed to hot-atom (Mu*) abstraction and substitution reactions. Comparisons with both hot-tritium (T*) and epithermal H* reactions in the alkanes reveal substantial isotope effects. In the case of CH4, a continued increase in P(D) at higher densities is likely due to a proton-transfer reaction from the molecular ion CH4Mu+ in the radiolysis track, forming CH3Mu, rather than to hot-atom reactions. Extrapolation of the present trend with density gives agreement with the value of P(D) found in liquid CH4, indicating that the diamagnetic muon polarization in dense alkanes depends primarily on density rather than on temperature or phase.},
	keywords = {CHARGE-EXCHANGE, CHEMISTRY, HOT-ATOM REACTIONS, HYDROCARBONS, HYDROGEN-ATOMS, LIQUIDS, POSITRONIUM, REACTION PROBABILITIES, THRESHOLD ENERGY, time},
	isbn = {0022-3654},
	url = {<Go to ISI>://A1991GG38300043},
	author = {Kempton, J. R. and Arseneau, D. J. and Fleming, Donald G. and Senba, M. and Gonzalez, A. C. and Pan, J. J. and Tempelmann, A. and Garner, D. M.}
}
@article {7058,
	title = {TIME-DEPENDENT ELECTRON-DISTRIBUTION FUNCTIONS AND DEGRADATION SPECTRA - A COMPARISON OF THE SPENCER-FANO EQUATION AND THE BOLTZMANN-EQUATION},
	journal = {Applied Radiation and Isotopes},
	volume = {42},
	number = {10},
	year = {1991},
	note = {ISI Document Delivery No.: GL858Times Cited: 8Cited Reference Count: 43SYMP ON THE PHYSICS OF ELECTRON TRANSPORTAPR 02-03, 1990GAITHERSBURG, MDUS DOE, OFF HLTH \& ENVIRONM RES},
	pages = {985-994},
	type = {Proceedings Paper},
	abstract = {The thermalization of electrons in gaseous moderators for initial nonequilibrium distributions not far removed from thermal energies has been studied previously with a Fokker-Planck equation for electron distribution. For electron energies in the keV to eV energy range an approach based on the Spencer-Fano equation has also been used. The present paper considers a detailed comparison of the two approaches to electron thermalization. The Spencer-Fano equation is analogous to the Fokker-Planck equation but with the moderator temperature set to zero, that is, with the cold gas approximation. The effect of the cold gas approximation on the time evolution of the nonequilibrium distributions and on the calculation of thermalization times is discussed in detail. The cold gas approximation is shown to be the basis for most of the concepts used in radiation chemistry and physics to study electron degradation. Applications to the thermalization of electrons in the inert gases are considered. The analysis is restricted to elastic electron-moderator collisions.},
	keywords = {ARGON, HELIUM, HOT-ATOM REACTIONS, INITIAL PRODUCTS, NITROGEN, RARE-GAS MODERATORS, SUBEXCITATION ELECTRONS, THERMALIZATION, TRANSPORT, YIELDS},
	isbn = {0969-8043},
	url = {<Go to ISI>://A1991GL85800010},
	author = {Kowari, K. and Shizgal, B.}
}
