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Dive into the research topics where Michael J. Dick is active.

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Featured researches published by Michael J. Dick.


Molecular Physics | 2007

High-resolution investigation of the excited electronic states of CaSH and SrSH by laser excitation spectroscopy

P. M. Sheridan; Michael J. Dick; Ji-Gang Wang; Peter F. Bernath

A laser ablation/pulsed molecular jet system has been used to record high-resolution laser excitation spectra of the 2 A′– 2 A′ transition of CaSH and the 2 A′– 2 A′, 2 A″– 2 A′, and 2 A′– 2 A′ transitions of SrSH. The rotationally-resolved data were analysed using an asymmetric top Hamiltonian (A-reduction) to determine rotational and fine structure parameters. A combined fit of all the newly measured and the previously recorded spectroscopic data for both CaSH and SrSH was performed. In the excited states observed in this study, both species were found to have a bent geometry. The spin-rotation parameters were analysed in terms of the pure precession and unique perturber approximations. In the excited electronic states of SrSH, the large spin-rotation interaction was found to cause perturbations between the Ka  = 0 and 1 levels within each state. In the 2 A′ and 2 A″ states of both species, the metal-sulfur bond length was found to decrease relative to the ground state, which is consistent with previous...


Journal of Physical Chemistry A | 2009

Optical-optical double resonance spectroscopy of the C(2)Pi-A(2)Pi and D(2)Sigma(+)-A(2)Pi transitions of SrF.

Phillip M. Sheridan; Jin-Guo Wang; Michael J. Dick; Peter F. Bernath

Optical-optical double resonance spectroscopy has been used to record rotationally resolved spectra of the C(2)Pi-A(2)Pi and D(2)Sigma(+)-A(2)Pi transitions of SrF. In the investigation, the spectrum of a previously unobserved (2)Sigma(+)-A(2)Pi transition was recorded. The new (2)Sigma(+) state was found to lie lower in energy than the previously labeled D(2)Sigma(+) (v = 0) state by an amount equal to the vibrational spacing of the D(2)Sigma(+) state. Therefore, the new (2)Sigma(+) state was assigned as the v = 0 level of the D(2)Sigma(+) state and the previous labeling of the vibrational quantum numbers of the D(2)Sigma(+) state should be increased by 1. Spectroscopic parameters were determined for the C(2)Pi, D(2)Sigma(+) (v = 0), and D(2)Sigma(+) (v = 1) states. The D(2)Sigma(+) (v = 0) state was found to be perturbed, most likely by the spin-orbit components of the C(2)Pi (v =1) state. The spin-orbit constant of the C(2)Pi state was found to decrease significantly relative to the A(2)Pi state, similar to CaF and SrOH. Finally, the C(2)Pi and D(2)Sigma(+) states do not appear to form a unique perturber/pure precession pair of states.


Journal of Chemical Physics | 2006

High-resolution laser excitation spectroscopy of the ÃE2-X̃A12 transition of SrCH3

Michael J. Dick; P. M. Sheridan; J.-G. Wang; Peter F. Bernath

High-resolution laser excitation spectroscopy has been used to record the AE2-XA12 electronic transition of SrCH3 in a laser ablation/molecular jet source. Transitions arising from the K′=1←K″=0, K′=0←K″=1, and K′=2←K″=1 subbands have been observed and assigned. The data were modeled with E2 and A12 symmetric top Hamiltonian matrices in a Hund’s case (a) basis, using a least squares fitting program. Rotational and fine structure parameters for the AE2 state were determined. A comparison of the spin-orbit energy separation in the AE2 state to other strontium containing free radicals showed that the Jahn-Teller effect is negligible. The spin-rotation constants for the AE2 state were calculated using the pure precession model and were found to be in good agreement with the experimentally determined parameters. These calculations suggest that the AE2 state of SrCH3 is not entirely of p orbital character. The rotational constants were used to estimate the structural parameters of SrCH3 in the AE2 state....


Molecular Physics | 2006

High-resolution investigation of the excited electronic states of CaSH and SrSH by laser excitation spectroscopy – ARTICLE WITHDRAWN

P. M. Sheridan; Michael J. Dick; J.-G. Wang; Peter F. Bernath

WITHDRAWN TO APPEAR IN SPECIAL ISSUE IN 2007


Journal of Chemical Physics | 2006

High-resolution laser excitation spectroscopy of the A2E-X2A1 transition of SrCH3.

Michael J. Dick; P. M. Sheridan; J.-G. Wang; Peter F. Bernath

High-resolution laser excitation spectroscopy has been used to record the AE2-XA12 electronic transition of SrCH3 in a laser ablation/molecular jet source. Transitions arising from the K′=1←K″=0, K′=0←K″=1, and K′=2←K″=1 subbands have been observed and assigned. The data were modeled with E2 and A12 symmetric top Hamiltonian matrices in a Hund’s case (a) basis, using a least squares fitting program. Rotational and fine structure parameters for the AE2 state were determined. A comparison of the spin-orbit energy separation in the AE2 state to other strontium containing free radicals showed that the Jahn-Teller effect is negligible. The spin-rotation constants for the AE2 state were calculated using the pure precession model and were found to be in good agreement with the experimentally determined parameters. These calculations suggest that the AE2 state of SrCH3 is not entirely of p orbital character. The rotational constants were used to estimate the structural parameters of SrCH3 in the AE2 state....


Journal of Chemical Physics | 2006

High-resolution laser excitation spectroscopy of the ÃE2-X̃A12 transition of SrCH3

Michael J. Dick; P. M. Sheridan; J.-G. Wang; Peter F. Bernath

High-resolution laser excitation spectroscopy has been used to record the AE2-XA12 electronic transition of SrCH3 in a laser ablation/molecular jet source. Transitions arising from the K′=1←K″=0, K′=0←K″=1, and K′=2←K″=1 subbands have been observed and assigned. The data were modeled with E2 and A12 symmetric top Hamiltonian matrices in a Hund’s case (a) basis, using a least squares fitting program. Rotational and fine structure parameters for the AE2 state were determined. A comparison of the spin-orbit energy separation in the AE2 state to other strontium containing free radicals showed that the Jahn-Teller effect is negligible. The spin-rotation constants for the AE2 state were calculated using the pure precession model and were found to be in good agreement with the experimentally determined parameters. These calculations suggest that the AE2 state of SrCH3 is not entirely of p orbital character. The rotational constants were used to estimate the structural parameters of SrCH3 in the AE2 state....


Fourier Transform Spectroscopy (2003), paper FMD7 | 2003

Fourier Transform Spectroscopy of Gas-Phase YbH and YbD

Iouli E. Gordon; Peter F. Bernath; Michael J. Dick; Colan Linton

The visible and infrared emission spectra of YbH/D were recorded with a Fourier transform spectrometer. New bands were observed in the range 4600-5700 cm-1. These experiments are the first step in a project to investigate spectra of lanthanide hydrides.


Journal of Molecular Spectroscopy | 2005

A high-resolution laser ablation study of the transition of SrCCH

Michael J. Dick; P. M. Sheridan; J.-G. Wang; Peter F. Bernath


Journal of Molecular Spectroscopy | 2006

Optical¿optical double-resonance spectroscopy of SrOH: The transition

J.-G. Wang; P. M. Sheridan; Michael J. Dick; Peter F. Bernath


Journal of Physical Chemistry A | 2005

High-resolution spectroscopic investigation of the B2A1-X2A1 transitions of CaCH3 and SrCH3

Phillip M. Sheridan; Michael J. Dick; Jin-Guo Wang; Peter F. Bernath

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J.-G. Wang

University of Waterloo

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Shanshan Yu

University of Waterloo

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Shanshan Yu

University of Waterloo

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