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shorter wavelengths of the point where a temperature increase had very little effect (actually a small decrease in absorption, as would be expected) Ribaud found that the absorption began again to increase with temperature. This evidently is the continuous absorption due to the higher vibrational states. For photochemical reactions the important consequence is that in such molecules one must expect the portion of the temperature coefficient due to light absorption to decrease with decreasing wavelength from the first appreciable absorption, but to pass through a minimum slightly less than unity, and then again to increase sharply to the disappearance of absorption.