The first edition, by PR Bunker, published in 1979, remains the sole textbook that explains
the use of the molecular symmetry group in understanding high resolution molecular …

Ergodicity, the central tenet of statistical mechanics, requires an isolated system to explore
all available phase space constrained by energy and symmetry. Mechanisms for violating …

A rotational analog of the vibrational potential energy surface is introduced for describing the
rotational fine structure of polyatomic molecules. Classical trajectories on rotational energy …

After an introductory survey, we introduce the seven fundamental symmetries of physics in
relation to the group of the molecular Hamiltonian and the current standard model of particle …

We present experimental evidence for nuclear spin selection rules in chemical reactions that
have been theoretically anticipated by Quack [M. Quack, Mol. Phys. 34, 477 (1997)]. The …

Molecules with identical nuclei hav-ing nonzero spin can exist in different states called
nuclear spin modifications by most researchers and nuclear spin isomers by some. Once …

The N= 1← 0 pure rotation transition in the ν= 19 level of the ground electronic state of H 2+
was observed at 14 961.7±1.1 MHz. Recent theory predicts significant electric dipole …

An analysis has been made of the vibration-rotation structure of the ν 3 band of 32 SF 6 from
measurements, by saturated absorption spectroscopy, of the frequencies for 136 transitions …

A simple approximate theory is developed for high-J spin-rotational levels and very-high-
resolution spectra of octahedral XY 6 (X spin-zero, Y spin-1/2) molecules. The structure and …

The energy levels and wavefunctions of spherical top molecules are classified using the
appropriate molecular symmetry group, and the spatial three-dimensional rotation group K …