Density dependence of the "escape" yield of hydrated electrons in the low-LET radiolysis of supercritical water at 400 °C.
The "spur lifetime" (τ(s)) in the low-linear energy transfer (LET) radiolysis of supercritical water (SCW) at 400 °C has been determined as a function of water density by using a simple model of energy deposition initially in spurs, followed by the random diffusion (Brownian motion) of the species formed until spur expansion is complete. The values of τ(s) are found to decrease from ∼5.0 × 10(-6) to 5.0 × 10(-8) s over the density range from 0.15 to 0.6 g cm(-3). Using Monte-Carlo simulations, our calculated density dependence of the "escape" hydrated electron (e(aq)(-)) yield (i.e., at time τ(s)) reproduces fairly well Bartels and co-workers' scavenged e(aq)(-) yield data, suggesting that these data may have been measured at times close to τ(s).
Département de Médecine Nucléaire et Radiobiologie, Faculté de Médecine et des Sciences de la Santé, Université de Sherbrooke, 3001, 12ème Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada.
Sunuchakan
S
Sanguanmith
Jintana
J
Meesungnoen
Jean-Paul
JP
Jay-Gerin
D004058:Diffusion; D004583:Electrons; D006358:Hot Temperature; D018499:Linear Energy Transfer; D008956:Models, Chemical; D013269:Stochastic Processes; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
D014867:Water