| Issue |
J. Phys. IV France
Volume 7, Number C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
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|---|---|---|
| Page(s) | C2-543 - C2-544 | |
| DOI | https://doi.org/10.1051/jp4/1997092 | |
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
J. Phys. IV France 7 (1997) C2-543-C2-544
DOI: 10.1051/jp4/1997092
1 Joint Research Center for Atom Technology, National Institute for Advanced Interdisciplinary Research, 1-1-4 Higashi Tsuluba, Ibaraki 305, Japan
2 On leave from A.F. Ioffe Physical-Technical Institute, Russia
3 Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan
© EDP Sciences 1997
J. Phys. IV France 7 (1997) C2-543-C2-544
DOI: 10.1051/jp4/1997092
Dynamical Bonds in the Photoexcited State of Amorphous Selenium Observed by In-Situ EXAFS
A.V. Kolobov1, 2, H. Oyanagi3 and K. Tanaka11 Joint Research Center for Atom Technology, National Institute for Advanced Interdisciplinary Research, 1-1-4 Higashi Tsuluba, Ibaraki 305, Japan
2 On leave from A.F. Ioffe Physical-Technical Institute, Russia
3 Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan
Abstract
Photostmctural change in amorphous selenium measured by high-precision in-situ EXAFS reveals a reversible
increase in the coordination number in the photoexcited state due to the formation of interchain bonds which are formed by
excited lone-pair electrons. These extra bonds, formed in concentration of up to 10%, are dynamical and break after
switching off the light resulting in a change of the chain topology. We demonstrate that this mechanism of the
photostructural change is also valid for compound chalcogenide glasses.
© EDP Sciences 1997