Spur Decay of the Solvated Electron in Picosecond Radiolysis Measured with Time-Correlated Absorption Spectroscopy

Abstract

Spur decay kinetics of the hydrated electron following picosecond pulse radiolysis of water have been measured using a time-correlated transient absorption technique with an asynchronous mode-locked laser. The 11 ns time window afforded by this signal-averaging technique is ideal to match up with more conventional transient absorption measurements taken to microsecond time scales. The precise data recorded in this study require a revision downward of the “time zero” solvated electron yield to approximately 4.0 per 100 eV of energy absorbed, to match the best available scavenger product measurements.

Water Radiolysis: Influence of Oxide Surfaces on H2 Production under Ionizing Radiation

“…The time resolution was then lowered to the nanosecond [32] and then picosecond time scale [33][34][35][36][37][38]. Among the species to be studied, the hydrated electron [39][40][41][42] and the  OH radical [43] have received most attention. These transient species are detected by different techniques: optical absorption (mainly in the UV-Visible, more recently in the infrared), conductivity, electron paramagnetic resonance, and so on.…”

A Drude-model approach to dispersion interactions in dipole-bound anions

“…Reactions involving electrons in bulk water are of fundamental importance in radiation chemistry, electrochemistry and biology. [88][89][90][91][92] Yet, even the nature of an excess electron in bulk water remains controversial. [93][94][95][96][97][98][99][100][101][102][103] Although the long-held view is that an excess electron in bulk water is trapped in an approximately spherical cavity, [104][105][106][107] giving the so-called hydrated electron, Domcke and coworkers have proposed that the excess electron is actually associated with a H 3 O species.…”

“…[88][89][90][91][92] The hydrated electron has been known since the early 1960's. 144 Anionic water clusters were first observed mass spectroscopically by…”

Charge transfer to solvent dynamics in iodide aqueous solution studied at ionization threshold

“…Solvated electrons can be generated through high-energy electrons or high-energy photons like γ-rays, which ionize molecules in the solution [31,49,50,51] according to the following reaction in the case of water…”