Molecule Types Symmetric Tops Transition Moments <Prev Next>

Symmetric Top Orbital Magnetic Transition Moment

This is appropriate for a magnetic dipole transition moment carried by the electronic orbital angular momentum. In principle the Hamiltonian for this interaction of the electron orbital magnetic moment with an external magnetic field is:


Degenerate states in a symmetric top can be thought of as having approximately one unit of angular momentum. To allow for the most general possible interactions, the l dependence is not included in evaluating the matrix element, and the Strength parameter will be essentially gLl. See MNR Ashfold, RN Dixon, N Little, RS Stickland and CM Western, J. Chem. Phys. 89 1754 (1988) for an example application.


Rank Rank of transition - 1 for a normal magnetic dipole transition.
Component Projection quantum number of transition moment - 0 for a parallel transition, 1 for a perpendicular transition. This gives the selection rule on the vibronic angular momentum, l.


Strength Transition (dipole) moment in units of the Bohr magneton. Note that the relative intensity is proportional to the square of this value.