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• W1979036009 abstract "An experimental investigation of the mechanism of scintillation of helium, helium-argon, and helium-neon mixtures excited by $ensuremath{alpha}$ particles has been performed. No detectable decrease in light yield was observed at pressures less than 3 atm when the applied electric field was increased in steps to $frac{E}{p}ensuremath{sim}1.0$ V/cm Torr, where $E$ is the electric field and $p$ is the gas pressure. The pulse shape of helium scintillation light consists of a slow component and a spike appearing on the leading edge of the pulse. The main component of light intensity is represented by the formula $mathrm{exp}(ensuremath{-}frac{t}{{ensuremath{tau}}_{m}})ensuremath{-}mathrm{exp}(ensuremath{-}frac{t}{{ensuremath{tau}}_{f}})$, where $t$ is the time in sec, ${ensuremath{tau}}_{m}=10ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}6}$ sec, and ${ensuremath{tau}}_{f}=0.3{p}^{ensuremath{-}2.2ifmmodepmelsetextpmfi{}0.3}$ sec ($p$ in Torr). Most of the emitted photons had a wavelength of less than 1050 AA{}A. On the basis of these results, it is concluded that the emitted photons are released in the decay of excited helium molecules formed as a result of a three-body collision between a metastable and two ground-state helium atoms. A characteristic large drop in the light yield for a mixture of a small proportion of argon in a major fraction of helium can be explained by the production of argon ions by metastable helium atoms (Penning process). The same characteristic large drop for a mixture of small concentration of neon in helium seems to be caused by the excitation transfer from helium to neon atoms. The cross section ${ensuremath{sigma}}_{f}$ for the formation of an excited helium molecule by a three-body collision is estimated to be $50ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}23}p$ ${mathrm{cm}}^{2}$ at 300ifmmode^circelsetextdegreefi{}K, where $p$ is in Torr. From the value of ${ensuremath{sigma}}_{f}$, the cross section ${ensuremath{sigma}}_{i}$ of the helium-argon Penning process is calculated as 41ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}16}$ and 14ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}16}$ ${mathrm{cm}}^{2}$ by using the ratios of ${ensuremath{sigma}}_{i}$ to ${ensuremath{sigma}}_{f}$ estimated by Jesse and Sadauskis and by Northrop and Gursky, respectively." @default.
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• W1979036009 date "1968-01-05" @default.
• W1979036009 modified "2023-10-14" @default.
• W1979036009 title "Mechanism of Scintillation of Helium, Helium-Argon, and Helium-Neon Gas Mixtures Excited by Alpha Particles" @default.
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• W1979036009 doi "https://doi.org/10.1103/physrev.165.225" @default.
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