Myran C. Sauer

LET dependence of transient yields in the pulse radiolysis of aqueous systems with deuterons and alpha particles.

The variation of G (

LET dependences of yields in the pulse radiolysis of aqueous systems with /sup 2/H/sup +/ and /sup 4/He/sup 2//sup +//sup 1/. [Aqueous KCNS solutions]

e{}_{{\rm aq}}{}^{-}

High-LET Pulse Radiolysis: 0?- and Oxygen Production in Tracks'

) with beam penetration depth, and hence, with LET, has been measured in water using 10-μsec pulses of 20-MeV deuterons and 40-MeV α p...

Theoretical analysis of the LET dependence of transient yields observed in pulse radiolysis with ion beams

The variation of G((CNS)/sup -//sub 2/) with beam penetration depth, and hence with linear energy transfer (LET), is determined in aqueous KCNS solutions using 8-..mu..sec pulses of 20 MeV /sup 2/H/sup +/ and 40 HeV /sup 4/He/sup 2//sup +/. Because the OH radical is the only precursor of (CNS)/sup -//sub 2/, this system provides a measure of G(HO). The experimental results on (CNS)/sup -//sub 2/ are in agreement with theoretical results of a model previously used to describe experimental results on G(e/sup -//sub aq/) vs LET.

Radiation chemistry of organic liquids: Saturated hydrocarbons

The production of

Radiation Chemistry of Synthetic Waste

{\rm O}_{2}{}^{-}

Electron capture rate constants for solutes in alkane liquids measured by transient photoconductivity

in the radiolysis of water at pH 7 and 11 has been investigated using pulses of 20-MeV deuterons and 40-MeV alpha particles. The G-values of

Yield of the O(/sup 3/P) atom in the radiolysis of water by 20-MeV /sup 2/H/sup +/ and 40-MeV /sup 4/He/sup 2 +/

{\rm O}_{2}{}^{-}...

High mobility solvent holes in cycloalkane liquids studied by a two-color laser ionization

A theoretical analysis of the LET dependence of transient yields 10/sup -5/ sec after energy deposition by /sup 2/H/sup +/ and /sup 4/He/sup 2 +/ is presented. The model used takes into account the separation of the track core and the delta-ray tracks. Diffusion-kinetics methods are used to calculate the time dependences of transient concentrations in the track core and in the delta-ray tracks. Since the model also specifies the relative energetic importances of the different energy-deposition modes, composite G values can be calculated for comparison with experiment, and the agreement is found to be satisfactory.

Unification of electron scavenging and fluorescence quenching results in cyclohexane radiolysis—Evidence for the importance of excited ions☆

Publisher Summary This chapter examines the radiolysis of neat organic liquids. By virtue of having low dielectric constant and only C-C and C-H bonds, hydrocarbons represent an ideal medium to examine the fundamental mechanisms of radiolysis in non-polar media. The chapter focuses on paraffins, branched alkanes, and cycloalkanes. The ionizing radiation interacts with the solvent to produce excited solvent molecules and electron-hole pairs. Spurs containing one or several electron-hole pairs are generated in scattering events involving the primary and secondary electrons. A large fraction of the ejected electrons thermalize before they escape the Coulomb attraction of the positive charges. Few of these electrons can escape beyond the Onsager radius, while the majority recombines with the holes. Being non-polar, hydrocarbons are unable to solvate the electrons and localized electrons remain close to the conduction band. Thermal promotion of these electrons to the conduction band leads to overall high mobility. The chapter discusses high-mobility solvent holes in cyclic alkanes and reviews the recent advances in understanding the spur chemistry, starting from the laser and VUV studies of isolated ion pairs to modeling the multiple-pair spurs. The chapter also examines the studies on solvent and solute excited states in radiolysis of hydrocarbons.