XeF* (C1/2) radiative lifetime measurement

J. Gary Eden; Stuart K. Searles

doi:10.1063/1.89370

XeF* (C1/2) radiative lifetime measurement

J. Gary Eden, Stuart K. Searles

Research output: Contribution to journal › Article › peer-review

Abstract

By monitoring the spontaneous emission from electron-beam-excited xenon difluoride (XeF₂) plasmas, the radiative lifetime of XeF* [C (1/2)] has been determined. Excited XeF was formed directly through electron-impact dissociative excitation of XeF₂. The time behavior of the subsequent 351-nm fluorescence displayed two distinct exponential decay regions. The first was characterized by a pressure-independent decay constant of 16.5±5 ns, the radiative lifetime of XeF* [C (1/2)]. The time constant of the second region was linearly dependent on XeF₂ pressure, indicating that C-state XeF molecules are, in the late afterglow, formed by a two-body collision process exhibiting a large rate constant (∼3×10^-10 cm³ sec^-1).

Original language	English (US)
Pages (from-to)	287-290
Number of pages	4
Journal	Applied Physics Letters
Volume	30
Issue number	6
DOIs	https://doi.org/10.1063/1.89370
State	Published - 1977
Externally published	Yes

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Physics and Astronomy (miscellaneous)

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10.1063/1.89370

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abstract = "By monitoring the spontaneous emission from electron-beam-excited xenon difluoride (XeF2) plasmas, the radiative lifetime of XeF* [C (1/2)] has been determined. Excited XeF was formed directly through electron-impact dissociative excitation of XeF2. The time behavior of the subsequent 351-nm fluorescence displayed two distinct exponential decay regions. The first was characterized by a pressure-independent decay constant of 16.5±5 ns, the radiative lifetime of XeF* [C (1/2)]. The time constant of the second region was linearly dependent on XeF2 pressure, indicating that C-state XeF molecules are, in the late afterglow, formed by a two-body collision process exhibiting a large rate constant (∼3×10-10 cm3 sec-1).",

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AB - By monitoring the spontaneous emission from electron-beam-excited xenon difluoride (XeF2) plasmas, the radiative lifetime of XeF* [C (1/2)] has been determined. Excited XeF was formed directly through electron-impact dissociative excitation of XeF2. The time behavior of the subsequent 351-nm fluorescence displayed two distinct exponential decay regions. The first was characterized by a pressure-independent decay constant of 16.5±5 ns, the radiative lifetime of XeF* [C (1/2)]. The time constant of the second region was linearly dependent on XeF2 pressure, indicating that C-state XeF molecules are, in the late afterglow, formed by a two-body collision process exhibiting a large rate constant (∼3×10-10 cm3 sec-1).

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XeF* (C1/2) radiative lifetime measurement

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