Recent Advances in Physical And Inorganic Chemistry
Recent Advances in Physical And Inorganic Chemistry
Alfred W Alfred Walter Stewart
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We give an exposure of, say, fifteen seconds, and then develop the plate. On examination, the negative will be found to contain only part of the iron spectrum, for the quinone solution will have absorbed a portion of the rays. We lay the negative side by side with the standard plate, and are thus enabled to read off the wave-length at which the absorption begins. Instead of using wave-lengths, it is more usual to reckon in frequencies that is, the reciprocals of the wave-lengths. It is clear th...at the absorption spectrum which we obtain in this way is conditioned by two things : the length of the exposure and the strength of the solution. Taking the case of a tenth-normal solution of quinone as an example, we shall find the following. If we begin with a layer of solution 80 mm. In thickness, we find that all the spectrum beyond a frequency of about 2000 is absorbed (see Fig. 20, No. 1). When we reduce the thickness of the layer of solution in the cell to 70 mm. , a somewhat peculiar phenomenon occurs.
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