Conspectus Isolated boron clusters exhibit many intriguing properties, which have only
recently been unfolding with the hand-in-hand advancement of state-of-the-art experimental …

ABSTRACT In pre-Born–Oppenheimer (pre-BO) theory a molecule is considered as a
quantum system as a whole, including the electrons and the atomic nuclei on the same …

The question of classicality is addressed in relation with the shape of the nuclear skeleton of
molecular systems. As the most natural environment, the electrons of the molecule are …

Abstract We show herein that 1, 10‐dicyano substitution restricts the paragon fluxionality of
bullvalene to just 14 isomers which isomerize along a single cycle. The restricted fluxionality …

We discuss the effect of molecular symmetry on coherent tunneling in symmetric double-well
potentials whose two molecular equilibrium configurations are interconverted by nuclear …

We introduce the basic concepts of symmetry breakings and approximate constants of the
motion in relation to time scales for molecular primary processes from yoctoseconds to …

The planar boron cluster B 13+ provides a model to investigate the microscopic origin of the
second law of thermodynamics in a small system. It is a molecular rotor with an inner wheel …

Parity and nuclear spin symmetry are approximate symmetries, which for many primary
processes in molecular spectroscopy and kinetics lead to almost exact constants of the …

We develop the theory of nuclear ring currents induced by external magnetic fields in
torsional molecules. The theory is applied to toluene, whose torsion axis is oriented along …

The boron rotor B 13+ 11 consists of a tri-atomic inner “wheel” that may rotate in its pseudo-
rotating ten-atomic outer “bearing”—this concerted motion is called “contorsion.” B 13+ 11 in …