- Library Home /
- Search Collections /
- Open Collections /
- Browse Collections /
- UBC Theses and Dissertations /
- Nonlinear resonant photoionization in molecular iodine
Open Collections
UBC Theses and Dissertations
UBC Theses and Dissertations
Nonlinear resonant photoionization in molecular iodine Sil, Georgena Sarah Petty
Abstract
Strong photoionization spectra have been observed in molecular Iodine following laser excitation in the near ultraviolet. The dependence upon laser power, and the structure of the spectra are consistent with three-photon ionization with resonance in an intermediate state excited by two photons. Vibrational analysis indicates an electronic energy T[sub e] of 53,562.75 ± 1 cm⁻¹, a harmonic vibrational constant we of 241.4 ± 0.4 cm⁻¹, and an anharmonic vibrational constant toexe of 0.58 ± 0.06 cm⁻¹. Rotational analysis done by the Franck-Condon method, whereby the relative experimental band intensities are compared with theoretical values, indicates that the internuclear separation r[sub e] in the resonant electronic state is 2.567 ± 0.002A, corresponding to a rotational constant B of 0.04029 ± 0.00007 cm⁻¹. The new electronic state has, with high probability, the designation 1[sub g] . Several im purity lines were observed at exciting energies 26,297.14 ± 1 cm⁻¹ (half width 8.09 cm⁻¹), at 26,915.22 ± 1 cm⁻¹, and at 27,343.96 ± 1 cm⁻¹. The impurity signal varies as I[sub o][sup 2.02]. The features likely arise from complex molecular species formed in reactions at high temperature with l₂, and have not been identified. The photoionization efficiency of in nonlinear absorption exhibits an apparent resonance in the vicinity of 80,000 cm⁻¹ in terms of total molecular energy.
Item Metadata
Title |
Nonlinear resonant photoionization in molecular iodine
|
Creator | |
Publisher |
University of British Columbia
|
Date Issued |
1976
|
Description |
Strong photoionization spectra have been observed in molecular Iodine following laser excitation in the near ultraviolet. The dependence upon laser power, and the structure
of the spectra are consistent with three-photon ionization
with resonance in an intermediate state excited by two photons. Vibrational analysis indicates an electronic energy T[sub e] of 53,562.75 ± 1 cm⁻¹, a harmonic vibrational constant we of 241.4 ± 0.4 cm⁻¹, and an anharmonic vibrational constant toexe of 0.58 ± 0.06 cm⁻¹. Rotational analysis done by the Franck-Condon method, whereby the relative experimental band intensities are compared with theoretical values, indicates that the internuclear separation r[sub e] in the resonant electronic
state is 2.567 ± 0.002A, corresponding to a rotational constant
B of 0.04029 ± 0.00007 cm⁻¹. The new electronic state
has, with high probability, the designation 1[sub g] . Several im
purity lines were observed at exciting energies 26,297.14 ± 1
cm⁻¹ (half width 8.09 cm⁻¹), at 26,915.22 ± 1 cm⁻¹, and at
27,343.96 ± 1 cm⁻¹. The impurity signal varies as I[sub o][sup 2.02].
The features likely arise from complex molecular species
formed in reactions at high temperature with l₂, and have not
been identified. The photoionization efficiency of in
nonlinear absorption exhibits an apparent resonance in the
vicinity of 80,000 cm⁻¹ in terms of total molecular energy.
|
Genre | |
Type | |
Language |
eng
|
Date Available |
2010-02-08
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
|
DOI |
10.14288/1.0093711
|
URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
|
Campus | |
Scholarly Level |
Graduate
|
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.