“…If ozone is prepared from an isotopic oxygen mixture containing the excess of usual 16 O (about 57%), the intensities of the eight constituents are not equal, as can be seen from Figure 2, where the figures at each peak show the relative intensity with respect to the total intensity taken as 1. If the abundance of every isotopomer is purely statistical and the absorbance for ν 1+3 mode of all eight isotopic species is supposed to be the same (measurements for ozone isotopomers in liquid oxygen [14] show that for some vibrations it could be different for symmetrical molecules like 16 O 18 O 16 O and asymmetric molecules such as 16 O 16 O 18 O, but for the ν 1+3 mode the relative vibrational transition strengths are almost the same), then the relative intensities of molecules containing 0, 1, 2, or 3 18 O atoms for isotopically mixed ozone with 57% 16 O should be 0.185, 0.140, 0.105, and 0.08, respectively. A comparison of these figures with those in Figure 2 enables us to divide the three peaks of mixed isotopomers into two groups: those with intensities of 0.17-0.13 and those with intensities of 0.10-0.09.…”