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The main features of a self-modulating derivative densitometer as well as some typical results of the new method are reported. By comparing both derivative and nonderivative analysis of a spectrum conventionally recorded on a spectrographic plate, one can see that its detectability is increased by a factor much greater than 1. These experimental results are consistent with the gain to be expected by means of optical derivative spectroscopy.
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Aramu et al. (1966) studied this question.
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