A method in which a strong flash of light causes a photodecomposition reaction in a sample, producing intermediates such as free radicals and ions, and detecting them. This method is also called flash photolysis. Triplet and other electronic excited states can also be observed with this method. Rare gas discharge tubes and air gaps are used as flash light sources. A large-capacity capacitor (1-1000 μF) is connected to both ends of these light sources, which are then charged with a high voltage of 10-20 kV and then instantly discharged, resulting in a strong flash that lasts for about 1-10 μs. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
強力な瞬間光(せん光)によって試料に光分解反応を起こさせ,遊離基(ラジカル)やイオンなどの反応中間体を作り出すとともに,それらを検出する方法。フラッシュ光分解法ともよばれる。三重項状態などの電子励起状態もこの方法で観測される。せん光光源としては希ガス放電管やエアギャップが用いられる。これらの光源の両極に大容量のコンデンサー(1~1000μF)をつなぎ,それを10~20kVの高電圧で充電した後,瞬時に放電させると持続時間が1~10μs程度の強力なせん光が得られる。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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