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. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/19835 |
| Date | January 1976 |
| Creators | Sil, Georgena Sarah Petty |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| 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. |
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