Degree Type

Dissertation

Date of Award

2008

Degree Name

Doctor of Philosophy

Department

Chemistry

First Advisor

Hans U. Stauffer

Second Advisor

Xueyu Song

Third Advisor

Mark Gordon

Abstract

The conversion from purely femtosecond coherent anti-Stokes Raman spectroscopy (CARS) to a more advantageous hybrid femtosecond/picosecond CARS (fs/ps CARS) probe for time-resolved vibrational dynamics studies is detailed. This probe provides a number of benefits for the use of studying the evolution of electronically excited states, including rapid data acquisition speeds, increased spectral resolution, and discrimination against competing background signals. The high time resolution is shown to depend on the cross correlation of the excitation pulse and initial CARS pulses while the high frequency resolution is shown to depend on the final CARS electric field. The pump-fs/ps CARS probe technique is applied to study the dynamics of several excited state systems, including coumarin 153, where it was shown that complex dynamics exist between hydrogen bonded and non-hydrogen bonded species. Additionally, the complex behavior of the excited state vibrational evolution during solvation is explored. Finally, fs/ps CARS was used to probe the ground and excited state structures of N,N-dimethyl- p-nitroaniline to study the effects of the charge transfer character on the ground and excited state molecular structure as well as the relaxation process after internal conversion.

DOI

https://doi.org/10.31274/rtd-180813-16869

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Benjamin Douglas Prince

Language

en

Proquest ID

AAI3307084

OCLC Number

243695419

ISBN

9780549543350

File Format

application/pdf

File Size

143 pages

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