Nanosecond proton pulse radiolysis of aqueous solutions. Part 2.—Improved measurements and isotope effects

A nanosecond pulse radiolysis study of the hydrated electron with high energy ions with a narrow velocity distribution

“…Literature data concern experiments with 3 MeV proton pulses of 1 ns duration (the mean LET was 29 eV/nm) [3,4], microsecond pulses of various ions [1,2,13,14] or continuous irradiation followed by the analysis of the final products resulting from reactions with various scavengers [17,25,26]. It is of interest to compare values obtained under similar LET conditions if one assumes that the concentrations of the primary radical species are only determined by the deposited energy in the ionization track.…”

“…A few studies have been performed with high energy pulsed heavy ions to depict the effects of the linear energy transfer (LET) on the radiolysis of liquid water [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. For many years the physical-chemistry occurring in the ionisation tracks of heavy ions has been described in a general way [15,16].…”

Radiolysis of Aqueous Solutions with Pulsed Ion Beams. 4. Product Yields for Proton Beams in Solutions of Thiocyanate and Methyl Viologen/Formate

“…[3][4][5] However, only a few experiments using ion beam pulse radiolysis have been reported. [6][7][8][9][10][11][12][13][14][15] There are many difficulties in performing pulse radiolysis with ion beams, including the short particle range, low beam intensity, and relatively long pulse duration. The advantage to steadystate ion beam radiolysis is that many more systems are available to probe water decomposition, especially those systems examined comprehensively in high-energy electron pulse radiolysis.…”

“…Burns et al measured e aqyields directly using nanosecond proton pulse radiolysis. 6,7 Pulse radiolysis studies at longer times require the use of a scavenger for the e aqthat gives an optically observable product stable for the duration of the experiment. The absorption due to the OH radical is much smaller than that for the e aqand in the UV region, so scavenger methods are also necessary.…”

Diffusion-Kinetic Theories for LET Effects on the Radiolysis of Water

“…There is only a small amount of experimental information available on the radiation chemical kinetics of high-LET particle tracks. A number of scavenger experiments probing the yields of the radicals eaq-4•5 and OH6-10 and of the molecular products H2 and H2O2 have been performed,4•7-9•11-13 and there are some limited data on the time-resolved determination of the yield of eaq- [14][15][16][17] and of OH. 18 This paper considers diffusion-kinetic theories for elucidating the chemical consequences of track structure with the goal of providing a better understanding of the experimental data.…”