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Why Do Molecules Echo Atomic Periodicity?, Ray Hefferlin, Jonathan Sackett, Jeremy Tatum
Why Do Molecules Echo Atomic Periodicity?, Ray Hefferlin, Jonathan Sackett, Jeremy Tatum
Faculty Works
Franck–Condon factors are investigated for sequences of free
main-group diatomic molecules. Theory-based Condon loci
(parabolas) and Morse-potential loci are plotted on Deslandres
tables to verify if they, indeed, follow the largest Franck–Condon
factors. Then, the inclination angles of the Condon loci
are determined. Thus, entire band systems are quantified by
one variable, the angle. For all available isoelectronic sequences,
this angle increases from a central minimum toward
magic-number molecular boundaries. The theory for the Condon
locus gives the angle in terms of the ratio of the upperstate
to the lower-state force constants. It is concluded that
the periodicity is caused …