$\mathrm{\Delta }I=4$ and $\mathrm{\Delta }I=8$ bifurcations in rotational bands of diatomic molecules

It is shown that the recently observed $\mathrm{\Delta }I=4$ bifurcation seen in superdeformed nuclear bands is also occurring in rotational bands of diatomic molecules. In addition, signs of a $\mathrm{\Delta }I=8$ bifurcation, of the same order of magnitude as the $\mathrm{\Delta }I=4$ one, are observed both in superdeformed nuclear bands and rotational bands of diatomic molecules.