On a Connexion between the Spectra of Argon and Ionised Potassium

Abstract

THE quantitative relations between the spectra of argon and ionised potassium have been for some time a subject of investigation in the Amsterdam Laboratory. The available observations are chiefly due to Schillinger (Wiener Sitz. Ber. 118, 605, 1909), McLennan (Proc. R.S., 100, 182, 1921), and Dik and Zeeman (Proc. Kon. Acad. Amsterdam, 1922, 1923). Schillinger used a spark for the production of the K⁺ spectrum, McLennan, as well as Dik and Zeeman, the electrodeless discharge. Dik and Zeeman got a rather pure K⁺ spectrum, because with very intense discharges the arc lines were entirely suppressed, a result at variance with that of other observers. The observations were obtained with a quartz spectrograph. The accuracy is, therefore, not sufficient for a scrutinising analysis, and observations with a grating spectrograph were projected.