Abstract
Abstract1,3,3-Trimethylindolino-6’-nitrobenzopyrylspiran (spiran) in a polymcr matrix is reversibly changed to two coloured spccies by an electron beam bombardment (cathodochromism). It is similar to photochromism. The major species due to the bombardment appears to be the same as the photoproduct. The other is produced only by the bombardment and is closely related to the polymer. Unlike the case of photoreaction, all components of the specimen are affected by bombarded electrons. Therefore the minor product is thought to be formed by a rcaction between the major one and a compound liberated from the matrix; moreover it is more stable than the major one. Owing to the formation of the minor product, the spiran-polymer matrix system is not. Suitablw for an erasable and reusable electron beam recording medium, but it is rather promising for permanent rccording use.
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