Department of Physics (Fredericton)

Hyperfine Analysis of the (2, 0) [18.3]3-X3Δ3 Transition of Cobalt Monoboride
Hyperfine Analysis of the (2, 0) [18.3]3-X3Δ3 Transition of Cobalt Monoboride
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.
Pulsed-laser spectroscopy of the highly excited C 2 and 1 2 states of MgH
Pulsed-laser spectroscopy of the highly excited C 2 and 1 2 states of MgH
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).
The spectrum of N2 from 4,500 to 15,700 cm−1 revisited with PGOPHER
The spectrum of N2 from 4,500 to 15,700 cm−1 revisited with PGOPHER
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.
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