Q _ { \ ell m } is the same as the electric multipole moment in the static case if it were applied to the static charge distribution \ rho ( \ mathbf { x } ) whereas Q _ { \ ell m }'corresponds to an induced electric multipole moment from the intrinsic magnetization of the source material.
32.
Q _ { \ ell m } is the same as the electric multipole moment in the static case if it were applied to the static charge distribution \ rho ( \ mathbf { x } ) whereas Q _ { \ ell m }'corresponds to an induced electric multipole moment from the intrinsic magnetization of the source material.
33.
More precisely, type "'D "'fields occur as the field of a gravitating object which is completely characterized by its mass and angular momentum . ( A more general object might have nonzero higher multipole moments . ) The two double principal null directions define " radially " ingoing and outgoing null congruences near the object which is the source of the field.
34.
At present it seems that only approximate solutions modeling slowly rotating fluid balls are known . ( Slowly rotating fluid balls are the relativistic analog of oblate spheroidal balls with nonzero mass and angular momentum but vanishing higher multipole moments . ) However, the exterior of the Neugebauer Meinel disk, an exact dust solution which models a rotating thin disk, approaches in a limiting case the GM ^ 2 = cJ Kerr geometry.
35.
Both ordinary and collision-induced spectra may be observed in emission and absorption and require an electric or magnetic multipole moment-in most cases an electric dipole moment-to exist for an optical transition to take place from an initial to a final quantum state of a molecule or a molecular complex . ( For brevity of expression we will use here the term " molecule " interchangeably for atoms as well as molecules ).
