Browsing by Author "Tokaryk, D.W."

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    An alternative approach to interferogram collection and processing for a vintage Bomem DA3 Fourier transform spectrometer
    (Elsevier, 2019-08-12) Guislain, B.G.; Harvey, R.A.R; Tokaryk, D.W.; Ross, A.J.; Crozet, P.; Adam, A.G.
    We describe a new way of collecting data from Bomem DA3 Fourier transform spectrometers, bypassing the original computers used by these instruments, which are obsolete and more prone to failure than other parts of the system. We collect the interferogram, helium-neon reference laser, and a trigger marking zero path difference with a modern computer as a function of time at a high data rate, as opposed to as a function of position along the scanning arm of the interferometer. The interferogram is then reconstructed as a function of position (measured in helium-neon fringes) by interpolation. The resulting spectra are at least as good as those obtained from the original data processing methods. This work can be used as a model for reviving other DA3 systems which are in good order with respect to mechanical and electronic components, but with nonfunctional computers, or for collecting and processing data for any other Fourier transform spectrometers.
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    High-resolution spectroscopy of the [18.4]2.5 – X2Δ5/2 transition of ruthenium monoboride (RuB)
    (Elsevier, 2020-06-30) Dore, J.M.; Adam, A.G.; Linton, C.; Tokaryk, D.W.
    Laser-induced fluorescence spectra of the (0, 0), (1, 0) and (0, 1) bands of the [18.4]2.5 – X2Δ5/2 transition have been recorded at high-resolution for several isotopologues of ruthenium monoboride (RuB). We report band origins and rotational parameters for 12 of the 14 possible isotopologues (7 for each of Ru11B and Ru10B) as well as hyperfine parameters of 99RuB and 101RuB. An anomalous isotope shift in the (0, 0) and (0, 1) bands indicates a weak perturbation in the [18.4]2.5 v = 0 vibrational level. The observed hyperfine structure is mainly due to the nuclear spin (I = 5/2) of the two Ru isotopes. Hyperfine structure due to the 11B and 10B isotopes was not resolved and resulted in, at most, a slight broadening of the lines. The magnetic hyperfine parameters help to confirm the (11σ)2(5π)4(2δ)3 configuration of the ground electronic state and provide insight into the configuration of the excited states.
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    Synchrotron-based rotation-vibration spectroscopy of imidazole
    (Elsevier, 2022-06-14) Tokaryk, D.W.; Crouse, J.G.; Kim, Doyeon
    We report the observation of the far-infrared absorption spectra of the ν21, ν20, ν19, ν18 and ν17 bands of imidazole in the 480-840 cm−1 range, taken at the Canadian Light Source using synchrotron radiation. The ν21, ν18 and ν17 bands were rotationally assigned and analyzed. Observations of the ν20 and ν19 bands were limited to their dense, unresolved Q branches. The analysis provided accurate origins for all five bands, and a first rotational characterization of the ν18 and ν17 levels, as well as a global fit that includes data from recent microwave experiments on the ground vibrational state and low-lying excited vibrational levels [Astron. Astrophys. 628 (2019) A53, J. Mol. Spectrosc. 378 (2021) 111452].