Abstract

In order to study the phototropism exhibited by certain monoazo dyes more completely, a shutter and a sample illuminator were constructed for use with a Cary Recording Quartz Spectrophotometer. By use of this device the dye solutions can be exposed to a strong light source during the dark periods of the chopping shutter of the instrument. In this way solutions which show a very rapid phototropic change can be studied.

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