 Cathodoluminescence is a materials property, but with various specimen treatments required and other limitations in SEM the properties are obscured or altered or impossible to detect and hence this mode of detection has not become popular in the past.The advent of ESEM with its unlimited potential may provoke more interest in this area too, in the future.The characteristic elemental X-rays produced also in the ESEM can be detected by the same detectors used in the SEM.