The objective of this work is to test whether vibration frequencies ν1 of free, ground-state, main-group triatomic molecules manifest a periodicity similar to those of atomic spectroscopic constants. This test and an earlier test on energies of atomization underscore the role of the periodic law as a foundation of chemistry. Using data from four data bases and from computation, we have collected and have mapped ν1 data in mathematical spaces of fixed-period molecules. These spaces are 8×8×8 atom cubes with rare-gas molecules on each face. The ν1 collected from various sources might be of use in searches for cold triatomics in interstellar space.
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