Browsing by Author "Adam, A. G."

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    High-resolution laser and far-infrared Fourier transform synchrotron-based spectroscopy of selected molecules
    (University of New Brunswick, 2022-02) Zarringhalam, Hanif; Tokaryk, D. W.; Adam, A. G.
    In the first part of this thesis, three ruthenium-bearing diatomic molecules have been studied in the visible region of the electromagnetic spectrum. Ruthenium monofluoride, ruthenium monochloride and ruthenium monoxide molecules were created in a molecular beam apparatus. The high-and low-resolution spectra of these small molecules were taken with the laser-induced fluorescence technique. The dispersed fluorescence technique was used to determine the vibrational frequencies of the RuF, RuCl and RuO molecules. The results of the high-resolution analysis of the spectra revealed extensive isotopic structures of the three molecules. Spin-orbit and hyperfine interactions in the ruthenium monofluoride molecule were observed and analyzed. Hyperfine structure in the ruthenium monoxide molecule was also detected and studied. In the second part of the thesis, three medium-sized ring molecules, catechol, furan and pyrrole, belonging to the C2v point group, have been studied in the infrared region. Vibrational bands of pyrrole and furan were collected between 800-900 cm-1 at the Canadian Light Source with an FTIR technique. Observed vibrational bands of pyrrole and furan in that region were studied. A nearby level that had A2 symmetry which could not be accessed from the ground states had perturbed the fully overlapped bands of these molecules. Also, progress has been made in obtaining the first high-resolution rotationally resolved vibrational band of catechol at the Canadian Light Source.
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    Hyperfine Analysis of the (2, 0) [18.3]3-X3Δ3 Transition of Cobalt Monoboride
    (Elsevier, 2019) Dore, J. M.; Adam, A. G.; Tokaryk, D. W.; Linton, C.
    High-resolution laser-induced fluorescence spectra of the (2, 0) [18.3]3-X3Δ3 transition of cobalt monoboride (CoB) have been recorded. We report updated rotational parameters for both the [18.3]3 (v′ = 2) and X3Δ3 (v″ = 0) states of Co11B, as well as newly determined hyperfine interaction parameters. The observed hyperfine splitting is mainly due to the nuclear spin of 59Co (I = 7/2, μ/μN = 4.627); the 11B (I = 3/2, μ/μN = 2.689) interaction only results in broadening of the individual hyperfine transitions. The magnetic hyperfine constants help confirm the ground state electronic configuration, (8σ)2(3π)4(1δ)3(9σ)1, and provide more insight into the configurational mixing in the excited state.
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    Pulsed-laser spectroscopy of the highly excited C 2 and 1 2 states of MgH
    (Elsevier, 2019) Caron, N. S.; Tokaryk, D. W.; Adam, A. G.
    We present the results of laser-ablation molecular jet experiments on the high-lying C 2Π and 1 2∆ electronic states of MgH, obtained via laser-induced fluorescence with frequency-doubled pulsed laser beams and with a visible- visible double resonance technique. The C 2Π state is examined for the first time in nearly 50 years. The 1 2∆ state was last reported in 1937, when it was misassigned as the D 2Σ− state. These two states are fit with a modern standard Hamiltonian. Finally, measurements of the lifetime of the F2 J = 1.5 f level in the v = 0 A 2Π state are reported; lifetimes of levels of the C 2Π state were very short (less than the 10 ns lower limit available in our experiment).