Correlation of the Fluorescent and Absorption Spectra of Iodine

Statistics – Computation

Scientific paper

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Scientific paper

The lines near Hg5460 in Wood's fluorescent spectrum of iodine excited by the quartz mercury arc are identified with definite lines in the absorption spectrum. This identification furnishes the key to the analysis of the absorption spectrum. Values of the constants of the iodine spectrum, based on new measurements, are as follows: for the unexcited state B0''=0.037300+/-0.000003, I0''=7.42×10-38 g.cm2, r0''=2.66×10-8 cm; for the excited state B'(26)=0.023368+/-0.000005, I'(29)=11.83×10-38 g.cm2, r'(29)=3.37×10-8 cm; C(29, 0)=-0.013932, mH''(29, 0)=1.677. The identification, in the absorption bands, of both components of the fluorescent doublets makes possible the calculation of absolute rotation quantum numbers; and these furnish direct evidence for the hypothesis of half quantum numbers. Lines in Wood's magnetic rotation spectrum which show the "normal" direction of rotation are found to belong to P branches; those which show the opposite direction, to R branches. Three new series of fluorescent doublets, ν(29, 4512), ν(29, 5012) and ν(29, 5112), extending to the -1 order, are found and formulated, and their relationship to bands (29,1) and (29,0) demonstrated. Revised versions of Mecke's equations for band heads, based on corrected numbering, and of the constants of four red bands, based on new computations, are given; and the apparent occurrence of Q branches in the red bands is shown to be due to the fact that the values of these constants are such as to cause the lines of the P and R branches to coincide. Calculated values of the constants of the fluorescent series, based on the results of the new absorption measurements, agree well with the values of these constants determined empirically from the fluorescent spectrum. Every detail is in agreement with the theory advanced by Lenz to account for the simple fundamental series of doublets excited by the narrow green mercury line.

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