Quantum-dynamical consequences of the permutation symmetry of methyl groups.
We identify the nuclear spin isomers of nitromethane (CH(3)NO(2)) and discuss how symmetry arguments may be used to determine the spectrum and eigenfunctions of the spatial and spin-dependent Hamiltonians in an elegant way. Furthermore, we explore the effect of nuclear spin on the dynamics of the methyl group induced by a time-dependent magnetic field. We demonstrate that dipolar interactions between the protons can give rise to rotation of the methyl group and show within a one-dimensional model and first order time-dependent perturbation theory that the induced motion is unidirectional and nuclear-spin selective.
Grohmann
Thomas
T
Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany.
Leibscher
Monika
M