Two- and three-body collision coefficients for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Xe</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow/><mml:mrow/><mml:mrow/><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow><mml:mo>)</mml:mo></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Xe</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow/><mml:mrow/><mml:mrow/><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow><mml:mo>)</mml:mo></mml:math>atoms and radiative lifetime of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Xe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mi>u</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>)</mml:mo></mml:math>molecule
Abstract
The time dependence of the vacuum-uv emissions from xenon was studied at pressures ranging from 4 to 1000 Torr. Excitation of the atoms was provided by a low-intensity electron beam. Measurements were made at the wavelengths of the $\mathrm{Xe}(^{3}P_{1})$ resonance line, the 1500-\AA{} (first) continuum, and the 1700-\AA{} (second) continuum. Two- and three-body collision coefficients for the destruction of $\mathrm{Xe}(^{3}P_{1})$ atoms and a three-body coefficient for $\mathrm{Xe}(^{3}P_{2})$ metastables were determined. A radiative lifetime of 99 nsec for the ${1}_{u}$ molecular state was measured at the wavelength of the second continuum. The pressure dependence of the decay constants at the three wavelengths leads to the following results: The collisional deexcitation rate for the transition $\mathrm{Xe}(^{3}P_{1})$ to $\mathrm{Xe}(^{3}P_{2})$ is ${9.1\ifmmode\times\else\texttimes\fi{}10}^{3}$ ${\mathrm{sec}}^{\ensuremath{-}1}$/Torr. The three-body coefficient for $\mathrm{Xe}(^{3}P_{1})$ atoms is 46 ${\mathrm{sec}}^{\ensuremath{-}1}$/${\mathrm{Torr}}^{2}$. The three-body destruction rate of $\mathrm{Xe}(^{3}P_{2})$ metastables is 40 ${\mathrm{sec}}^{\ensuremath{-}1}$/${\mathrm{Torr}}^{2}$. The estimated uncertainty in the results is \ifmmode\pm\else\textpm\fi{}10%.
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