Methods for Determining Transition Probabilities from Line Absorption

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Abstract
Computation of quantum transition probabilities from measurements of absorption in spectral lines.—The various steps are discussed, practical methods being given for performing the calculations. The absorption coefficient can be found by the exponential law from knowledge of the intensity of absorbed and non-absorbed light. In doing this, the intensity curve must be corrected for slit width, and a simple method for this, applicable when there is good resolution, is given. Also methods are given for fitting constants of the ordinary formula for absorption coefficient in a spectral line to the observed data. Several points connected with half breadth, failure of the exponential law with poor resolution, are discussed and finally formulas are given for finding the atomic transition probabilities from the constants of the absorption formula.

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