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- W2080711241 startingPage "2295" @default.
- W2080711241 abstract "Photoconductivity measurements have been made on single-crystal samples of SrO which were as received, irradiated at room temperature with $ensuremath{gamma}$ rays, or irradiated at temperatures down to 77 K with 1.5-MeV electrons or 1.5-MeV protons. The measurements were made over the spectral range from 2 to 6.2 eV and at temperatures from 63 to 180 K. ${F}^{+}$ centers introduced into the samples by particle irradiation produce a photocurrent which measurement indicates is carried by electrons. The free-electron yield from ${F}^{+}$ centers increased sharply between 63 and 100 K from which it is estimated, using a two-level model, that the thermal activation energy for release of free electrons is 0.12 ifmmodepmelsetextpmfi{} 0.01 eV. The two-level model also gives a value of 5 ifmmodetimeselsetexttimesfi{} ${10}^{6}$ for the ratio $frac{{ensuremath{tau}}_{R}}{{ensuremath{tau}}_{0}}$, where $frac{1}{{ensuremath{tau}}_{0}}$ is the pre-exponential frequency factor for thermal ionization and ${ensuremath{tau}}_{R}$ is a temperature-independent lifetime for decay from a relaxed excited state of the ${F}^{+}$ center. As the incident photon energy increased towards the band edge there was a sharp rise in the photoresponse in both irradiated and unirradiated samples. The photoresponse reached a maximum at an energy of 5.4 eV, and then decreased sharply as the incident photon energy increased further." @default.
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- W2080711241 date "1977-02-15" @default.
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- W2080711241 title "Low-temperature photoconductivity in SrO" @default.
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- W2080711241 doi "https://doi.org/10.1103/physrevb.15.2295" @default.
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