Inhomogeneity effect, molecular absorption

The spectra can further be interpreted to describe the excited-state dynamics [28b, d The advantage of our cold molecular jet experiment is that inhomogeneous effects are minimized. In absorption, all lines are lifetime broadened because of the efficient photochemistry of OCIO. The magnitude of this broadening does not depend on the rotational quantum numbers, but is strongly dependent on the... 

On a submicro scale, techniques of the kind developed by Caspersson (1936 and 1940) and his school, as also those of Cole and Brackett (1940) and Thorell (1947), are essentially extensions and developments of macro-spectrophotometric methods. Criticisms of such techniques must arise from doubts as to the validity of Beer-Lambert laws of absorption in small inhomogeneous objects in uncollimated beams (Commoner, 1949, Commoner and Lipkin, 1949). However these techniques when applied to certain selected objects, e.g. crystals, are free from this criticism of inhomogeneity of material and may be used in much the same manner as the macrotechniques, with the added advantage that the sample may be solid and the effect of molecular orientation studied in polarized radiation. 

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