Optical Processes in Krypton and Krypton(2)fluoride: Absolute Cross-Sections for Multiphoton Ionization of Krypton (1S(0)), Photoionization of Metastable Atomic and Molecular States of Krypton, Andabsorption of Krypton(2)fluoride (4-Doublet-Gamma)

A microwave absorption apparatus has been used to measure a cross section for the three-photon, resonantly-enhanced ionization of Kr(('1)S(,0)) at 193 nm. The presence of a two-photon resonance with the Kr 6p 3/2 (,2) level enabled the generation of large electron densities and a measurement of the two-photon absorption cross section. A similar technique was developed to measure the photoionization cross sections for metastable Kr(,2) (('3)(SIGMA)(,u)('+)) and Kr (5s 3/2 (,2)) at 248 nm. The kinetics result of these experiments led to a method of producing Kr(,2)F (4('2)(GAMMA)). A fluorescence suppression technique was utilized to measure the absolute absorption spectra of Kr(,2)F (4('2)(GAMMA)) throughout the visible and at various points in the UV. Similar measurements were also made for Kr(,2)('+) (1(1/2)(,u)) and Xe(,2)Cl (4('2)(GAMMA)) and the results are compared. Photoassociation of KrF(B) was also observed and used as a further check on the results.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Geohegan, David Bruce

• Physics, Atomic

Language dc:language

eng

Identifier

(UMI)AAI8623303

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/77390