鶏冠石からパラ鶏冠石への光誘起相転移メカニズム
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概要
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Light-induced phase transformation from realgar to pararealgar has been studied by means of single-crystal X-ray diffraction and X-ray photoelectron spectroscopy. The photochemical degradation causes the increase of As<SUB>4</SUB>S<SUB>4</SUB> intermolecular distances and the production of the As<SUB>4</SUB>S<SUB>5</SUB> molecules. The results suggest the following cyclic process. 1st : an S atom in the As<SUB>4</SUB>S<SUB>5</SUB> is released from one of the As-S-As linkages in As<SUB>4</SUB>S<SUB>5</SUB> which becomes the As<SUB>4</SUB>S<SUB>4</SUB> pararealgar molecule, 2nd : the free S atom is re-attached to another As<SUB>4</SUB>S<SUB>4</SUB> realgar molecule and reproduces an As<SUB>4</SUB>S<SUB>5</SUB> molecule, and 3rd : the As<SUB>4</SUB>S<SUB>5</SUB> is again divided into an As<SUB>4</SUB>S<SUB>4</SUB> pararealgar molecule and an S atom.
- 日本結晶学会の論文
- 2007-12-31
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- 鶏冠石からパラ鶏冠石への光誘起相転移メカニズム