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Degree

Master of Science (MS), Bowling Green State University, Chemistry, 2006.

Abstract

The primary photochemical processes that occur via a two photon mechanism in pure water during high intensity excitation with a femtosecond pulse at 267 nm were studied by using a white light continuum as probe pulse. Two photon femtosecond laser studies of the excitation and relaxation of pure water showed that, geminate lifetimes were comparable with reported data but the recorded absorption spectrum was blue shifted. Experiments carried out for highly concentrated lithium compounds with different anion indicated that these compounds produced their maximum transient absorption between the wavelengths of 550nm to 700nm. The time profiles of these compounds fell into two major categories. LiI and LiOH showed different kinetic profiles from the others by the initial presence of a short lived species along with longer decay kinetics, where as LiCl, LiBr and LiClO4 shows typical decay kinetics of long lived species only. The fitted experimental data on single exponential function for absorption kinetics of LiCl showed that the absorption rise time falls into same time regime as reported for the purported three body complex of NaCl. This leads to the thought that LiCl may follow the same mechanism. The concentration dependence study of LiCl showed its absorption maxima were red shifted as the concentration was changed from high to low. The kinetic data revealed that rate of absorption for low concentrated solution of LiCl is higher than that of high concentrated LiCl solution. The comparison of LiCl with KCl and NaCl showed that there is a significant contribution from the cation for higher concentrated solution to alter their kinetic and transient absorption. But in the case of low concentrated solutions that effect is not significant.

Subject Headings

Chemistry, Radiation

Keywords

LiCl; absorption; transient absorption; Hydrated Electrons; Solvated Electrons

Advisor

Michael A.J. Rodgers

Pages

54p.

Document number: bgsu1154537086
Permalink: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1154537086

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