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ii. 693 General and Physical Chemistry. Ultra-red Spectra. 11. A Direct Measurement of the Magnitude of Energy Quanta. NIELS BJERRUM (Ber. Deut. phyoikal. G c~. , 1914, 16, 640-642. Compare A., 1912, ii, 1114).-By application of the theory of quanta, it is shown that the frequency of molecular rotation can be obtained from t,he formula v = n . h/2+J, in which J is the moment of inertia, n an integer, and h is the fundamental quantum of energy. The rotation frequencies calculated from thisdoi:10.1039/ca9140605693 fatcat:3etilyi4ibgqxlbr6agln3qjra