室温でのKBr結晶におけるMバンドの一振舞い

概要

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It　has　been　found　that　in　additively　colored　KBr　crystals,　which　contain　F　and　Mcenters,　the　bleaching　of　M　band　occurs　temporarily　with　white　light　irradiation　at　room temperature.　When　this　decay　of　M　band　occurs,　absorption　bands　in　700～800　nmregion　increase　simultaneously.　Upon　prolonged　irradiation　with　white　light　the　M　bandbleaches　until　it　reaches　a　minimum,　after　which　it　usually　increases.　From　an　analysisof　dichroism　observed　in　700～800　nm　bands,　it　has　been　suggested　that　melt-grown　KBrcrystals　contain small amounts　of　sodium.　It　is　possible　that　these　sodium　atoms　play　animportant　role　in　the　bleaching　of　M　centers.　This　possibility　is　discussed　with　the　formation mechanism　of　FA　and　M　centers.
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