Abstract
A SHORT note by me on the spectrum of doubly ionised krypton was published in NATURE of Feb. 16, 1929 (vol. 123, p. 244). Since then the observational data with regard to the spectrum of krypton have been extended up to λ1930 A. on the ultra-violet side. In the region of about 41,000 frequency units, some very strong lines, namely, 42,475.1(10) and 40,560.3(9), have been observed. Although the lines of Kr++ due to the transition 3N2(O2 ← O3) had been located near this region, it did not seem probable that this transition would give rise to such intense lines—lines more intense than the fundamental lines due to 3N2(O1 ← O2).
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