The secondary spectrum of hydrogen at higher pressures.— II

Abstract

In a recent paper the author has discussed the possibilities presented by the arc spectrum of hydrogen at higher pressures of detecting regularities in the secondary spectrum. In the present paper the same method has been used to investigate further regularities. Four bands are given whose null lines approximately follow a Rydberg law. Of these the most intense band contains a series that has already been given by Richardson and Tanaka. P, Q, and R Combination including Richardson and Tanaka’s 83 Q .—With the aid of the arc spectrum an attempt has been made to fit a P and an R series into a combination along with Richardson and Tanaka’s 83 Q. The results recorded in Table I are sufficient to indicate a considerable degree of probability for the proposed combination, more particularly in view of the accuracy with which the Combination Principle holds. The strong Fulcher line 16060·31 is unlikely to be a member of the band, but has been included since it probably overshadows a weaker P(2).