光触媒・光表面反応の新展開　　フェムト秒ポンプ‐プローブ拡散反射吸収分光法による半導体光励起初期過程の追跡

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書誌事項

タイトル別名
  • Frontiers of Photo-catalysis and Photo-reaction at Solid Surfaces. Direct Observation of Initial Processes in Photoexcited Semiconductor by Femtosecond Pump-Probe Diffuse Reflectance Absorption Spectroscopy.
  • フェムトビョウ ポンプ プローブ カクサン ハンシャ キュウシュウ ブンコウホウ ニ ヨル ハンドウタイ ヒカリレイキショキ カテイ ノ ツイセキ

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説明

Photoirradiation onto semiconducting materials with light of energy greater than their band gap induces creation of pairs of photoexcited electron and positive hole. They react with the species adsorbed on the surface to give redox reactions, otherwise undergo mutual recombination without substantial chemical reactions. Such redox reactions, i.e., heterogeneous electron (or positive hole) transfer triggered by light, at solid/liquid or solid/gas interfaces are called “photoelectrochemical”; or “;photocatalytic”; reactions, and of great importance from both fundamental and applied standpoints. However, mechanism and/or dynamics of such reactions has been poorly understood, because of difficulties of spectroscopic measurement due to heterogeneity of the reaction systems including interfaces, as well as to the rate of electron transfer much faster than the detection limit of conventional time-resolving techniques. Recent progress in laser technology enabled us to measure directly the dynamics of heterogeneous electron transfer with the time resolution even faster than hundred femtosecond. In this article, we show principles of femtosecond pump-probe reflectance absorption spectroscopy and review examples of studies using this promising technique.

収録刊行物

  • 表面科学

    表面科学 20 (2), 94-101, 1999

    公益社団法人 日本表面科学会

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