allowed transition

In these systems the forbidden transitions can occur, but usually at slower rates than allowed transitions.

For example, in a centrosymmetric molecule, one- and two-photon allowed transitions are mutually exclusive.

A Grotrian diagram or term diagram shows the allowed transitions between the energy levels of atoms.

It is a straight line for allowed transitions and some forbidden transitions, in accord with the Fermi beta-decay theory.

The allowed transitions are described by so-called selection rules, which describe the conditions under which a radiative transition is allowed.

Orgel diagrams will, however, show the number of spin allowed transitions, along with their respective symmetry designations.

The absorption spectra of these Fe molecules at different temperatures clearly show the change in intensities of the spin allowed transitions, due to these symmetric changes.

When the state of an atom has been specified with a term symbol, the allowed transitions can be found through selection rules by considering which transitions would conserve angular momentum.

With all components being suprafacial, the allowed transition state is boat-like; a chair-like transition state would result in three two-electron antarafacial components.

Light is absorbed and emitted at these fast time scales in cases where the energy of the photons involved matches the available energy states and allowed transitions of the substrate.

Here we may formally write the ground-state as, in which case the spin and orbitally allowed transition involves transferring an electron from one ligand to the metal, giving as the upper state.

The statement that energy levels can only go up or down one level at a time is known as a selection rule which states that the only allowed transitions between energy levels are:

Each allowed transition produces a resonance in and the resonance width is determined by a dephasing constant that generally depends on exciton states involved and the THz frequency .

The electric dipole moment of the dioxygen molecule, O is zero, but the molecule is paramagnetic with two unpaired electrons so that there are magnetic-dipole allowed transitions which can be observed by microwave spectroscopy.

In general, it is found that an allowed transition does not change significantly in intensity as the temperature is lowered, though the apparent energy may shift as the contribution from hot bands arising from vibrationally excited states is reduced.

Instead, each Singlespeech word has four "modes" corresponding to the four classical Greek elements (Earth, Air, Fire, Water), with each mode having a symbolic meaning borrowed from the Divinatory tarot, and complex grammatical rules govern the allowed transitions from mode to mode.

Hot bands, as mentioned earlier, show the effects of anharmonicity in the formation of sequences of bands; as they are already formally allowed transitions there is no enhancement in intensity due to Fermi resonance, though mixing of upper-state levels may affect the regularity of hot-band sequences.