Degree Type

Dissertation

Date of Award

1986

Degree Name

Doctor of Philosophy

Department

Chemistry

Abstract

The energetic and dissociation dynamics of (C(,2)H(,4))(,2)('+), (C(,2)H(,4))(,3)('+), (C(,3)H(,6))(,2)('+) and (c-C(,3)H(,6))(,2)('+) complexes have been studied by photoionization of neutral van der Waals ethylene dimers and trimers, propylene dimers and cyclopropane dimers. Photoionization efficiency studies of C(,2)H(,4), C(,3)H(,6) and c-C(,3)H(,6) and their clusters yield the ionization energies of (C(,2)H(,4))(,n=1,2,3), (C(,3)H(,6))(,n=1,2) and (c-C(,3)H(,6))(,n=1,2) and the appearance energies of C(,3)H(,5)('+) and C(,4)H(,7)('+) from (C(,2)H(,4))(,2). With the estimated values of (C(,2)H(,4))(,n=2,3,4), (C(,3)H(,6))(,2) and (c-C(,3)H(,6))(,2), the bond dissociation energies of (C(,2)H(,4))(,n=1,2,3)('+) C(,2)H(,4), C(,3)H(,6)('+) C(,3)H(,6) and c-C(,3)H(,6)('+) c-C(,3)H(,6) are deduced. It is concluded that the (C(,2)H(,4))(,3)('+), (C(,3)H(,6))(,2)('+) and (c-C(,3)H(,6))(,2)('+) loose complexes arrange to the common C(,6)H12+ collision complexes prior to fragmentation by comparing the major product channels in the unimolecular decompositions of these species. A new molecular beam laser photofragment time-of-flight mass spectrometer with rotatable beam source and movable detector has been constructed for studying photofragmentation dynamics of polyatomic molecules. The design considerations detailed assembly, and initial tests of this machine are described. The time-of-flight data of carbon disulfide laser photofragmentation at 193 nm have been taken at various beam source angles and fragment flight path lengths. The results give insight into the dynamics of the photofragmentation process;*USDOE Report IS-T-1260. This work was performed under Contract No. W-7405-Eng-82 with the U.S. Department of Energy.

DOI

https://doi.org/10.31274/rtd-180813-6803

Publisher

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

Copyright Owner

Wen-Bih Tzeng

Language

en

Proquest ID

AAI8627156

File Format

application/pdf

File Size

235 pages

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