レーザーを利用した新しい電気化学測定法とその可能性

抄録

Two new voltammetric techniques coupled with lasers are mainly described. One is laser thermal modulation voltammetry (LTMV), in which the intermittent laser beam serves as a heater modifying a temperature of the electrode and its surroundings periodically. The other is laser ablation voltammetry (LAV) in which the electrode surface is successively renewed or activated by an ablation action of the laser pulse. LTMV is useful for detecting not only a standard entropy change of the electrode reaction but also photo-induced phenomena such as photo-adsorption or -desorption at the electrode surface. On the other hand, LAV is a promising technique overcoming the deactivation of the solid electrode which electrocheniists have been suffering from for a long time. Further, LAV provides a stationary voltarnmogram, which is quite similar to a polarogram obtained by using a dropping mercury electrode (DME). Applying experimental techniques for transient optical spectroscopy to LAV allows us to carry out a time-resolved measurement even in the voltammetric experiment, which leads to a study of primary processes of the electrode reaction and a measurement of a potential of zero charge (PZC) on the solid electrode. A new field of electrochemistry is expected by applying various laser techniques to classical voltammetry.