Radiative Lifetime of the<i>v</i> = 0, 1 Levels of the \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr}

Shin, Saeyoung; Brugh, Dale J.; Morse, Michael D.

doi:10.1086/426468

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…Recently Shin, Bruch & Morse (2005) have measured radiative lifetimes of the v = 0, 1 levels of A 6 Σ + state of CrH. These measured lifetimes are about 16–45 per cent longer that those obtained by Burrows et al (2002).…”

Section: Introductionmentioning

confidence: 89%

The electronic bands of CrD, CrH, MgD and MgH: application to the ‘deuterium test’

Pavlenko

Harris

Tennyson

et al. 2008

Monthly Notices of the Royal Astronomical Society

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We compute opacities for the electronic molecular band systems A 6 + -X 6 + of CrH and CrD, and A 2 -X 2 + of MgH and MgD. The opacities are computed by making use of existing spectroscopic constants for MgH and CrH. These constants are adjusted for the different reduced masses of MgD and CrD. Frank-Condon factors are used to provide intensities for the individual vibronic bands. These results are used in the computation of synthetic spectra between T eff = 1800 and 1200 K with an emphasis on the realization of 'deuterium test', first proposed by Bejar et al. to distinguish brown dwarfs from planetary mass objects. We discuss the possible use of CrD and MgD electronic bands for the 'deuterium test'. We find CrD to be the more promising of the two deuterides, potentially, the most useful bands of CrH/CrD are the v = +1 and v = −1 at 0.795 and 0.968 μm.

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Section: Introductionmentioning

confidence: 89%

The electronic bands of CrD, CrH, MgD and MgH: application to the ‘deuterium test’

Pavlenko

Harris

Tennyson

et al. 2008

Monthly Notices of the Royal Astronomical Society

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“…The instrument employed is identical to that used in our previous studies of CrH, 28 CrC, 29 and in vibronically resolved studies of CrCCH, CrCH 3 , and NiCH 3 . 8 Chromium acetylide was produced by pulsed laser ablation (Nd:YAG, 532 nm, ∼2 mJ/pulse, 5 ns pulse duration) of a pure chromium sample in the throat of a pulsed supersonic expansion of helium containing 3% methane.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…These were obtained using the time-delayed resonant two photon ionization method, as described in our article on the fluorescence lifetime of CrH. 28 A fit of the vibronic features to the formula…”

Section: B Vibronically Resolved Spectrummentioning

confidence: 99%

Rotational analysis of the $3_0^1 $31 band of the $\tilde A{}^6\Sigma ^ + \leftarrow \tilde X{}^6\Sigma ^ + $Ã6Σ+←X̃6Σ+ system of CrCCH

Brugh

Morse

2014

The Journal of Chemical Physics

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The spectrum of chromium acetylide, CrCCH, has been investigated in the near-infrared region (10,500-14,500 cm(-1)) and an intense band system is observed. The 3₀¹ band of this system has been investigated at high resolution (0.025 cm(-1)) and this system is identified as the Ã⁶Σ⁺ ← X⁶Σ⁺ system, analogous to the near IR spectra of the CrH, CrF, and CrCl molecules. Among the many unidentified lines, we have assigned 341 lines belonging to 43 of the 54 allowed branches. Using combination differences, the rotational constants of the ground state have been determined. Computational results on the ground state are also reported, along with a comparison to other monoligated monovalent chromium compounds.

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“…Many reports on CrH can be found in the literature. ,− Table includes the calculated and experimental results reported during the past decade, together with the present results. The latest study was carried out by Shin et al They observed the emission spectrum of the A 6 Σ + −X 6 Σ + transition and analyzed the results to obtain the spectroscopic parameters for both electronic states. As shown in Table , the present estimations of the spectroscopic parameters seem reasonable in comparison with the corresponding observations, except that the dissociation energy is a bit too low.…”

Section: Resultsmentioning

confidence: 99%

Dissociation Potential Curves of Low-Lying States in Transition Metal Hydrides. 3. Hydrides of Groups 6 and 7

2006

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The dissociation energy curves of low-lying spin-mixed states for Group 5 hydrides (VH, NbH, and TaH), as well as Group 3 hydrides (ScH, YH, and LaH), have been calculated by using both effective core potential (ECP) and all-electron (AE) approaches. The two approaches are based on the multiconfiguration selfconsistent field (MCSCF) method, followed by second-order configuration interaction (SOCI) calculations: the first method employs an ECP basis set proposed by Stevens and co-workers (SBKJC) augmented by a set of polarization functions, and spin−orbit coupling effects are estimated with a one-electron approximation, using effective nuclear charges. The second method employs a double-ζ basis set developed by Huzinaga (MIDI) and three sets of p functions are added to both transition element and hydrogen and one set of f functions is also added to the transition element. The relativistic elimination of small components (RESC) scheme and full Breit−Pauli Hamiltonian are employed in the AE approaches to incorporate relativistic effects. The present paper reports a comprehensive set of theoretical results including the dissociation energies, equilibrium distances, electronic transition energies, harmonic frequencies, anharmonicities, and rotational constants for several low-lying spin-mixed states in the hydrides, filling a considerable gap in available data for these molecules. Transition moments are also computed among the spin-mixed states, and qualitative agreement is obtained for Group 3 hydrides in comparison with the experimental results reported by Ram and Bernath. Peak positions of emission spectra in Group 5 hydrides are also predicted. Disciplines Chemistry CommentsReprinted ( ReceiVed: January 13, 2004; In Final Form: March 13, 2004 The dissociation energy curves of low-lying spin-mixed states for Group 5 hydrides (VH, NbH, and TaH), as well as Group 3 hydrides (ScH, YH, and LaH), have been calculated by using both effective core potential (ECP) and all-electron (AE) approaches. The two approaches are based on the multiconfiguration self-consistent field (MCSCF) method, followed by second-order configuration interaction (SOCI) calculations: the first method employs an ECP basis set proposed by Stevens and co-workers (SBKJC) augmented by a set of polarization functions, and spin-orbit coupling effects are estimated with a one-electron approximation, using effective nuclear charges. The second method employs a double-basis set developed by Huzinaga (MIDI) and three sets of p functions are added to both transition element and hydrogen and one set of f functions is also added to the transition element. The relativistic elimination of small components (RESC) scheme and full Breit-Pauli Hamiltonian are employed in the AE approaches to incorporate relativistic effects. The present paper reports a comprehensive set of theoretical results including the dissociation energies, equilibrium distances, electronic transition energies, harmonic frequencies, anharmonicities, and rotational constants for sever...

show abstract

Cited by 10 publications

References 31 publications

The electronic bands of CrD, CrH, MgD and MgH: application to the ‘deuterium test’

The electronic bands of CrD, CrH, MgD and MgH: application to the ‘deuterium test’

Rotational analysis of the $3_0^1 $31 band of the $\tilde A{}^6\Sigma ^ + \leftarrow \tilde X{}^6\Sigma ^ + $Ã6Σ+←X̃6Σ+ system of CrCCH

Dissociation Potential Curves of Low-Lying States in Transition Metal Hydrides. 3. Hydrides of Groups 6 and 7

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