Abstract
Wave-number data.—The blue-green absorption bands of lithium have been photographed in the second order of a 21-foot grating. In the main, Li7 Li7, system the 2,0, 1,0, 0,0, 0,1 and 0,2 bands and in the isotopic, Li6 Li7, system the 1,0, 0,0, 0,1 bands and a somewhat incomplete 0,2 band have been measured and analyzed. Wave numbers of the lines of all these bands are tabulated. An unsuccessful attempt was made to identify Li6 Li6 band lines.

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