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Silver hydride bands . The AgH bands were photographed in the second order of a 21-foot Rowland grating using field strengths of 10,000, 13,000, and 33,000 gauss. They exhibit no Zeeman effect whatsoever. This is a verification of the assignment S 1 → S 1 to this type of band. Aluminum hydride bands . The observed broadening of the first lines in each branch is shown to agree quantitatively with the predictions of Van Vleck's formula for the change in energy produced by a magnetic field, providing the electronic transition is P 1 → S 1 and the values of j given by the new mechanics are used. In agreement with the theory, all but the first lines in each branch show no effect. Zinc hydride bands . The wide doublets ( separation = 2 · Δ ν norm ) found by Hulthén for the Q and R lines are shown to be quartets. These doublet separations tend to decrease at the highest field strengths. The P 1 and P 2 lines are unaffected at all field strengths up to 34,000 gauss. Hund's predicted first order Zeeman effect for his case b does not appear; that is, at field strengths strong enough to give a measurable effect the internal coupling of the spin axis is already broken down. Magnesium hydride bands . At 10,000 gauss all the lines show a broadening, the spread of the pattern of the P 1 ( 5 ) line being 1.56 cm - 1 although Δ ν norm is 0.47 cm - 1 . The pattern of the two components of the doublets fuse together, and as the field strength increases, the total width of this doublet pattern decreases. At 35,000 guass the whole pattern of the two lines is fused into one single broad line slightly less broad than the original no-field doublet. This appears to be a true Paschen-Back effect. No satellites splitting-off from one of the doublet components as reported for the CH and OH bands have been found.
Physical Review – American Physical Society (APS)
Published: Nov 1, 1927
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