INFRARED TRANSMISSION STUDIES. VOLUME 4. THE INFLUENCE OF NUMEROUS WEAK LINES ON THE ABSORPTANCE OF A SPECTRAL BAND
PHILCO NEWPORT BEACH CA AERONUTRONIC DIV
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The influence of numerous weak spectral lines on band absorption is investigated. It is shown that a regivalidity always exists for the weak line approximation. There is almost always also a region of validity for the strong line approximation, unless the number of spectral lines increases very rapidly as the intensity approaches zero. The principal effects of the weak lines are to introduce points of inflection in the absorptance curves and to increase the intermediate range of values of pressure and absorber concentration over which neither the strong nor weak line approximation is valid. These effects are illustrated by examples. From a study of the shape of experimentally deter mined absorptance curves it is possible to deduce the number of weak lines in the frequency interval of interest.
- Atomic and Molecular Physics and Spectroscopy