. Une étude spectroscopique de l'ionisation de l'Argon par collisions d'électrons. P. 124 (1920).% O. W. Bichardson et C. B. Bazzoni, < Phil. MAG., vol. 42, p. 1015 (1921).§ W. Duane, Bulletin de NAT. Research Council,1 vol. 1, p. 383 (1920).|| F. L. Mohler et P. D. Foote, Phys. BEV., vol. 18, p. 94 (1921). Étude de l'ionisation de l'argon par collisions d'électrons. 149 tension ionisante de potassium trouvée par ces expérimentateurs, soit 43 volts. Ce fait suggère que la plus basse des deux tensions données ci-dessus est celle qui correspond vraiment à la limite d'absorption M pour le potassium, et

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. A Spectroscopic Investigation of the Ionisation of Argon by Electron Collisions. p. 124 (1920).% O. W. Bichardson and C. B. Bazzoni, < Phil. Mag., vol. 42, p. 1015 (1921).§ W. Duane, Bulletin of Nat. Research Council, 1 vol. 1, p. 383 (1920).|| F. L. Mohler and P. D. Foote, Phys. Bev., vol. 18, p. 94 (1921). Investigation of Ionization of Argon by Electron Collisions. 149 ionising voltage of potassium found by these experimenters, viz., 43 volts.This fact suggests that the lower of the two voltages given above is the onewhich really corresponds to the M absorption limit for potassium, and thatthe greater of the two voltages given above is that required to remove twoelectrons simultaneously from the potassium atom, the outer more looselyattached electron, and one from the M ring of electrons. On this view, theoccurrence of a break in the ionisation curves at 23 + 1 volts is readilyexplained, and the agreement between the lower value given above and thatdetermined from the curve of fig. 6 is very satisfactory. o Atomic numbers for M^M^a-nd M^ lines 50 60 70 80 90. O 10 20 30 -*0 Atomic numbers for dotted line Fig. 6. 60 In the ease* of copper, the other element between molybdenum and argonfor which M series X-ray data are available, the value of the voltagecorresponding to the frequency of the M absorption limit deduced from thecurve is about 116 volts. This value agrees within the limits of experi-mental error with one of the critical points found by Kurth, * but ascribed * E. H. Kurfch, Phys. Bev., vol. 18, p. 461 (1921). 150 Investigation of Ionisation of Argon by Electron Collisions, by him to a hypothetical N series. Kurth obtained another break in hisradiation curve for copper, at about 300 volts, and this he attributes to theM series of copper. This value is, of course, very far from falling on thecurve connecting Eichardsons molybdenum value and our own argon value.Kurth admits, however, that the value attributed by him to an N series mayreally correspond

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