Excitation at Electrodes.
Annual technical rept. 1 Aug 70-30 Jul 71,
GTE LABS INC BAYSIDE N Y
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Electronic excitation of ions in electrode reactions has been observed. Rare earth ions in solutions of phosphorus oxychloride are excited and luminesce with emission characteristic of their photoluminescence in the same solution. The emission is observed at the surface of the negative electrode. Its characteristics are best explained by a model whereby ions approaching the region of the Helmoholtz double layer surrounding the electrode are excited by electrons injected into the ionic layer. The electrons which have left the high potential energy regions of the electrode interact in a region of considerably lower potential energy, allowing the excess energy to be used to excite approaching ions. With the use of this model, the ion distribution in the vicinity of the electrode may be measured. Examples of ion density profiles are given for a Tb metal-Pr3POCl3 solution interface. Author
- Physical Chemistry