Multiphoton ionization of hydrogen iodide and molecular iodine using photoelectron spectroscopy

Hydrogen iodide and I$\sb2$ molecules were studied by time-of-flight photoelectron spectroscopy using multiphoton ionization techniques. At a pumping wavelength of 532 nm, it was concluded that dissociation due to the intermediate repulsive valence states is very strong for both HI and I$\sb2.$ For HI, the dissociative valence states correlate with H($\sp1$S) + I($\sp2$P$\sb{3/2,1/2});$ And for I$\sb2,$ they correlate with I($\sp2$P$\sb{3/2,1/2})$ + I($\sp2$P$\sb{3/2,1/2}).$ As a result, ionization from the ground states of spin-orbit doublets $(\sp2$P$\sb{3/2,1/2})$ of atomic iodine is predominant in the photoelectron spectra. In contrast, photoionization of HI at 355 nm is direct, owing to the absence of the dissociative valence states. Vibrationally resolved spectra were observed for both of the spin-orbit doublets of the HI$\sp+$ ground state (v$\sp+$ = 10 for $\sp2\Pi\sb{3/2}$ and v$\sp+$ = 6 for $\sp2\Pi\sb{1/2})$ and the vibrational constants and anharmonicities were extracted from the data. Tunable laser experiments (567-578 nm) showed a new Rydberg series of I$\sb2$ converging to the excited state of $\rm I\sbsp{2}{+}(\sp2\Sigma\sb{3/2\rm u}).$

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Electrical and Computer Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Gu, Yiyun

Contributors dc:contributor

• Eden, James G.

• Engineering, Electronics and Electrical

Statement dc:rights

• Copyright 1993 Gu, Yiyun

Language dc:language

eng

Identifier

AAI9329048
(UMI)AAI9329048

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/20103