Other
Scientific paper
May 1910
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1910natur..83..276n&link_type=abstract
Nature, Volume 83, Issue 2114, pp. 276-277 (1910).
Other
Scientific paper
IT is well known that the separation of the mercury line λ 5770 in a magnetic field into a triplet is abnormal, inasmuch as the value of the ratio e/m of vibrating electrons is much greater than that obtained from experiments on kathode rays or from measurements of the Zeeman effect on other lines of mercury and of other elements. Lohmann first noticed that the line is separated into a nonet in strong fields, but did not investigate its type. By using an echelon spectroscope of resolving power 430,000 for λ = 0.5µ, I found that the distribution of lines in the nonet can be accurately examined by using a vacuum tube of special construction. From a field of 18,000 gauss upward, the lines composing the nonet were distinctly observed with my instrument. They are distributed in three groups of three lines each, closely arranged at equal intervals, and each group occupies the position of the normal triplet. No dissymmetry with respect to the middle line was noticed. Several measurements in fields between 18,000 and 28,000 showed that the separation of lines in each group is proportional to the field strength, so that in weak fields each group appears as a single line. The lines of the middle group are equally bright. but the intensity of the remaining two groups of lines diminishes as we proceed outwards, just as is the case with the mercury line 5461, which is also divided into a nonet. Runge's law is applicable to 5770; the type of the nonet is such that the lines form aliquot parts of a = e/m.H/4π, and the difference in the number of vibrations of these lines can be represented by Considered as a triplet, which corresponds to lines o, , Gmelin found that e/m = 2.02 × 107; v. Baeyer and Gehrcke obtained 2.06 × 107, which is also the number I have arrived at from the same standpoint. Considered as a nonet, however, we have to multiply the above number by 89, so that the corrected result turns out to be:- This is in close agreement with the same constant obtained from measurements on the nonet of the mercury line 5461, for which e/m = 1.80 × 107.
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