NDLI: The collisional quenching of Sr[5s4d(1D2)] by H2 and D2 over the temperature range 850–1100 K studied by time-resolved atomic emission following pulsed dye-laser excitation

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The collisional quenching of Sr[5s4d(¹D₂)] by H₂ and D₂ over the temperature range 850–1100 K studied by time-resolved atomic emission following pulsed dye-laser excitation

An improved carbon-13 nuclear shielding scale

Computer simulations of fluids in zeolites X and Y

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Journal of the Chemical Society, Faraday Transactions 2 Vol - 85 Issue - 5

Journal of the Chemical Society, Faraday Transactions 2 Vol - 85 Issue - 4

Journal of the Chemical Society, Faraday Transactions 2 Vol - 85 Issue - 3

Journal of the Chemical Society, Faraday Transactions 2 Vol - 85 Issue - 2

Journal of the Chemical Society, Faraday Transactions 2 Vol -83

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

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

The collisional quenching of Sr[5s4d(¹D₂)] by H₂ and D₂ over the temperature range 850–1100 K studied by time-resolved atomic emission following pulsed dye-laser excitation

Content Provider	Royal Society of Chemistry (RSC)
Author	Husain, David Roberts, Gareth
Copyright Year	1989
Abstract	We present a kinetic study of the collisional quenching of Sr[5s4d(1D2)], 2.498 eV above the 5s2(1S0) electronic ground state, by H2 and D2 across the temperature range T= 850–1100 K. Sr(1D2) was generated by the repetitive pulsed dye-laser excitation of strontium vapour at λ= 496.1 nm {Sr[5s4d(1D2)]â†� Sr[5s2(1S0)]} in the presence of excess helium buffer gas and H2 or D2 in a slow flow system, kinetically equivalent to a static system. Its exponential decay was monitored in emission at the resonance wavelength using Boxcar integration coupled with computerized analysis. Sr(1D2) was also monitored using the more intense bi-exponential atomic emission profiles for Sr[5s5p(3PJ)](1.807 eV), resulting from emission and collisional quenching of Sr(1D2), at λ= 689.3 nm {Sr[5s5p(3P1)]→Sr[5s2(1S0)]+hν}. The resulting rate data, which involve considerable experimental scatter that is considered in some detail, can be expressed in the form: kH2= 7 × 10–10 exp (–13 kJ mol–1/RT) cm3 molecule–1s–1 and kD2= 3 × 10–10 exp (–17 kJ mol–1/RT) cm3 molecule–1s–1 the data clearly indicating low energy barriers and fully in accord with energy transfer on collision, as also found hitherto for Sr(3PJ)+ H2 and D2. This is in marked contrast to previous measurements on Ca[4s4p(3PJ)] and Ca[4s3d(1D2)] by H2 and D2 where collisional removal was totally dominated by chemical reaction. Finally, branching ratios for collisional removal of Sr(1D2) into the lower-lying Sr[5s4d(3DJ)](2.260 eV) and Sr[5s5p(3PJ)] states, for which the individual contributions could not be separated, are estimated and found to lie in the range ca. 0.3–0.9 . consideration of the observed low activation energies, reaction ergicities and branching ratio estimates suggest that the collisional quenching of Sr(1D2) by H2 and D2 is dominated by (E–E, V) transfer resulting in the production of Sr(3DJ) and Sr(3PJ).
Starting Page	747
Ending Page	757
Page Count	11
File Format	PDF
ISSN	03009238
Volume Number	85
Issue Number	6
Journal	Journal of the Chemical Society, Faraday Transactions 2
DOI	10.1039/F29898500747
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Strontium Buffer gas Romantic Times Chemical reaction Branching fraction Electronvolt Nuclear magnetic resonance Helium Exponential decay Wavelength
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry

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The collisional quenching of Sr[5s4d(¹D₂)] by H₂ and D₂ over the temperature range 850–1100 K studied by time-resolved atomic emission following pulsed dye-laser excitation