Photoassociation of Kr-F collision pairs in the ultraviolet

J. H. Schloss; R. B. Jones; J. G. Eden

doi:10.1063/1.465840

Photoassociation of Kr-F collision pairs in the ultraviolet

J. H. Schloss, R. B. Jones, J. G. Eden

Electrical and Computer Engineering

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Abstract

The bound ← free absorption (photoassociation) of thermalized Kr(4p⁶ ¹S₀)-F(Zp⁵ ²P) collision pairs has been studied in the ultraviolet in Kr/F₂ gas mixtures by laser pump-probe techniques. Experiments carried out at 248 nm with two time-delayed excimer laser pulses demonstrate that KrF(B² Σ_1/2⁺) molecules are produced by the photodissociation of F₂, followed by the photoassociation of Kr-F collision pairs by a single ∼5 eV photon. The saturation behavior of this photoassociation process indicates that the currently accepted value for the KrF (B → X) stimulated emission cross section (2.6×10^-16 cm²) is too large by at least a factor of 2. A revised value for σ_SE of (1.2±0.6) × 10^-16 cm² is suggested. By indirectly monitoring the temporal decay of the atomic fluorine number density owing to reformation of F₂, the rate constant for the recombination of F atoms in a Kr background by three-body (2F+Kr) collisions has been determined to be k_r = 2×10^-32 cm⁶ s^-1.

Original language	English (US)
Pages (from-to)	6483-6494
Number of pages	12
Journal	The Journal of Chemical Physics
Volume	99
Issue number	9
DOIs	https://doi.org/10.1063/1.465840
State	Published - 1993

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General Physics and Astronomy
Physical and Theoretical Chemistry

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title = "Photoassociation of Kr-F collision pairs in the ultraviolet",

abstract = "The bound ← free absorption (photoassociation) of thermalized Kr(4p6 1S0)-F(Zp5 2P) collision pairs has been studied in the ultraviolet in Kr/F2 gas mixtures by laser pump-probe techniques. Experiments carried out at 248 nm with two time-delayed excimer laser pulses demonstrate that KrF(B2 Σ1/2+) molecules are produced by the photodissociation of F2, followed by the photoassociation of Kr-F collision pairs by a single ∼5 eV photon. The saturation behavior of this photoassociation process indicates that the currently accepted value for the KrF (B → X) stimulated emission cross section (2.6×10-16 cm2) is too large by at least a factor of 2. A revised value for σSE of (1.2±0.6) × 10-16 cm2 is suggested. By indirectly monitoring the temporal decay of the atomic fluorine number density owing to reformation of F2, the rate constant for the recombination of F atoms in a Kr background by three-body (2F+Kr) collisions has been determined to be kr = 2×10-32 cm6 s-1.",

author = "Schloss, {J. H.} and Jones, {R. B.} and Eden, {J. G.}",

year = "1993",

doi = "10.1063/1.465840",

language = "English (US)",

volume = "99",

pages = "6483--6494",

journal = "The Journal of Chemical Physics",

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publisher = "American Institute of Physics",

number = "9",

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T1 - Photoassociation of Kr-F collision pairs in the ultraviolet

AU - Schloss, J. H.

AU - Jones, R. B.

AU - Eden, J. G.

PY - 1993

Y1 - 1993

N2 - The bound ← free absorption (photoassociation) of thermalized Kr(4p6 1S0)-F(Zp5 2P) collision pairs has been studied in the ultraviolet in Kr/F2 gas mixtures by laser pump-probe techniques. Experiments carried out at 248 nm with two time-delayed excimer laser pulses demonstrate that KrF(B2 Σ1/2+) molecules are produced by the photodissociation of F2, followed by the photoassociation of Kr-F collision pairs by a single ∼5 eV photon. The saturation behavior of this photoassociation process indicates that the currently accepted value for the KrF (B → X) stimulated emission cross section (2.6×10-16 cm2) is too large by at least a factor of 2. A revised value for σSE of (1.2±0.6) × 10-16 cm2 is suggested. By indirectly monitoring the temporal decay of the atomic fluorine number density owing to reformation of F2, the rate constant for the recombination of F atoms in a Kr background by three-body (2F+Kr) collisions has been determined to be kr = 2×10-32 cm6 s-1.

AB - The bound ← free absorption (photoassociation) of thermalized Kr(4p6 1S0)-F(Zp5 2P) collision pairs has been studied in the ultraviolet in Kr/F2 gas mixtures by laser pump-probe techniques. Experiments carried out at 248 nm with two time-delayed excimer laser pulses demonstrate that KrF(B2 Σ1/2+) molecules are produced by the photodissociation of F2, followed by the photoassociation of Kr-F collision pairs by a single ∼5 eV photon. The saturation behavior of this photoassociation process indicates that the currently accepted value for the KrF (B → X) stimulated emission cross section (2.6×10-16 cm2) is too large by at least a factor of 2. A revised value for σSE of (1.2±0.6) × 10-16 cm2 is suggested. By indirectly monitoring the temporal decay of the atomic fluorine number density owing to reformation of F2, the rate constant for the recombination of F atoms in a Kr background by three-body (2F+Kr) collisions has been determined to be kr = 2×10-32 cm6 s-1.

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Photoassociation of Kr-F collision pairs in the ultraviolet

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