Journal Articles
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Articles. Typically the realization of research papers reporting original research findings published in a journal issue. (URI: http://purl.org/coar/resource_type/c_6501) Item types include:
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Browsing Journal Articles by Subject "Physics"
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Item A uranium atlas, from 365 to 505 nm(Elsevier, 2020-03-02) Ross, Amanda J.; Crozet, Patricia; Adam, Allan G.; Tokaryk, Dennis W.A Fourier-transform spectrum of the emission from a commercial uranium hollow-cathode lamp 19,800–27,400 cm−1 is proposed, in ascii format, as a possible aid to calibration of laser excitation spectra.Item 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.Item 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.Item 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.Item Identification of a vibrationally excited level in methyl formate through microwave and far-infrared spectroscopy(Canadian Science Publishing, 2020-04-15) Kobayashi, Kaori; Sakai, Yusuke; Fujitake, Masaharu; Tokaryk, Dennis W.; Billinghurst, Brant E.; Ohashi, NobukimiMethyl formate (HCOOCH3) is an important interstellar molecule. More than 1000 rotational transitions including those from the ground state, torsionally excited states, and of its isotopologues have been observed towards several astrophysical sources. The laboratory spectra of methyl formate in the microwave spectral region contain many unassigned transitions and many of them are likely to be due to rotational transitions in the low-lying excited states. We report the laboratory identification of new rotational transitions in the COC deformation (ν12) excited state. The identification was made possible by combining the microwave data with rotation–vibration spectra taken in the far-infrared region at the Canadian Light Source synchrotron.Item 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).Item Synchrotron-based rotation-vibration spectroscopy of imidazole(Elsevier, 2022-06-14) Tokaryk, D.W.; Crouse, J.G.; Kim, DoyeonWe 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].Item The spectrum of N2 from 4,500 to 15,700 cm−1 revisited with PGOPHER(Elsevier, 2018) Western, Colin, M.; Carter-Blatchford, Luke; Crozet, Patrick; Ross, Amanda, J.; Morville, Jérôme; Tokaryk, Dennis, W.Using a reference molecular atlas to ensure self-consistency of wavelength calibration is widespread practice. Boesch & Reiners (Astronomy & Astrophysics 582 A43 (2015)) reported a line list from a discharge of molecular nitrogen from 4500 to 11,000 cm−1 for this purpose. With a hollow-cathode discharge source, we have extended the experimental spectrum up to 15,700 cm−1, to include the range of Ti:sapphire lasers, since the density of N2 lines is greater than atomic atlases in common use. Recognizing that experimental conditions can vary, we have also analysed the spectra (comprising several B3Πg−A3Σu +, B′ 3Σu −−B3Πg, and W3Δu −B3ΠgN2 bands) with standard Hamiltonians, so that any part of the discharge spectrum in the range 4,500–15,700 cm−1 can be simulated. Parameters are given to do this with the spectral simulation and analysis package PGOPHER. (C. Western, J. Quant. Spectrosc. Rad. Transf., 186, 221 (2016)). The analysis also included high-level ab initio calculations of potential energy curves, transition moments and spin-orbit coupling constants and these were used in preparing the model, extending the potential range of applicability. The results are available in a variety of formats to suit possible applications, including the experimental spectrum in ASCII, a detailed line list with positions and Einstein A coefficients, and a PGOPHER input file to synthesize the spectrum at selectable temperature and resolution.