NDLI: Collisional quenching of Mg(33PJ) studied by time-resolved emission, 33P1→ 31S0+hν(λ= 457.1 nm), following dye-laser excitation

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Journal of the Chemical Society, Faraday Transactions 2 Vol - 79 Issue - 5

Journal of the Chemical Society, Faraday Transactions 2 Vol - 79 Issue - 4

Journal of the Chemical Society, Faraday Transactions 2 Vol - 79 Issue - 3

Journal of the Chemical Society, Faraday Transactions 2 Vol - 79 Issue - 2

Journal of the Chemical Society, Faraday Transactions 2 Vol -69

Collisional quenching of Mg(3³P_J) studied by time-resolved emission, 3³P₁→ 3¹S₀+hν(λ= 457.1 nm), following dye-laser excitation

Content Provider	Royal Society of Chemistry (RSC)
Author	Schifino, José Husain, David
Copyright Year	1983
Abstract	The collisional quenching of electronically excited magnesium atoms, Mg[3s3p(3PJ)], 2.71 eV above the Mg[3s2(1S0)] ground state, has been studied for a number of added gases following repetitive dye-laser pulsing. Subsequent to the dye-laser excitation at λ= 457.1 nm of magnesium vapour to the 3s3p(3P1) state and Boltzmann equilibration within the 3PJ manifold through collisions, the resulting slow, forbidden spontaneous emission, Mg(33P1)→ Mg(31S0)+hv, was then used to minitor the decay of Mg(33PJ) in the presence of various collision partners, using boxcar integration. The following absolute second-order quenching rate constants at T= 800 K are reported (kQ cm3 molecule–1 s–1; errors 1σ): D2, (1.9 ± 0.1)× 10–13; CO2, (1.0 ± 0.1)× 10–12; N2O, (4.9 ± 0.1)× 10–13; CF4, (6.5 ± 0.2)× 10–14; C2H2, (3.8 ± 0.2)× 10–11; C2H4, (1.4 ± 0.1)× 10–10; and C6H6, (3.5 ± 0.1)× 10–10. These data, together with previous results using this signal-averaging technique on a flow system, kinetically equivalent to a static system, are compared, where possible, with absolute rate data derived either from a slow flow–discharge system or dye-laser excitation coupled with either atomic resonance absorption or fluorescence in the ‘single-shot mode’. The significant isotope effect for the collisional removal of Mg(33PJ) by H2 and D2 is considered in some detail.
Starting Page	919
Ending Page	930
Page Count	12
File Format	PDF
ISSN	03009238
Volume Number	79
Issue Number	6
Journal	Journal of the Chemical Society, Faraday Transactions 2
DOI	10.1039/F29837900919
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Exhaust manifold Spontaneous emission Isotope Electronvolt Magnesium Nuclear magnetic resonance
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry

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