The optical contrast between solid and liquid potassium in transmitted ultra-Violet light

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Abstract
Transmission ultra-violet light microscopy can be used to study the melting and solidification of films of potassium. It is possible to differentiate between the solid and liquid phases by a form of optical contrast so that direct observations can be made on the structure of freezing and melting fronts and on the influence of microstructure on these processes. This paper is primarily concerned with the nature of the optical contrast. It shows how this depends on the change of refractive index of the metal during melting and the interference of multiple reflections from the surfaces of the film.

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