With laser techniques, however, the molecular energy levels of the impurities are quite different from the atomic ones.

The molecular energy levels are labelled by the molecular term symbols.

However held, wherever kept, it had the capacity of recording some twenty million words on each of three molecular energy levels.

A vastly simplified molecular energy level diagram is compared with the H-atom diagram on the following page.

In contrast, Schrödinger (left) scrutinizes these processes on a microscopic scale in terms of molecular energy levels and populations.

Atomic and molecular energy levels have been incorporated up to 50.000 K avoiding extrapolation of the JANAF data.

However, the spontaneous emission of the first rotational state of molecular hydrogen is practically nonexistent (rotational states are different molecular energy levels) even after many thousands of years.

The entropies and other thermodynamic properties of many gases were also determined from quantum statistics and molecular energy levels available from band spectra as well as other sources.

Generally, a chemical species can be defined as an ensemble of chemically identical molecular entities that can explore the same set of molecular energy levels on a defined time scale.

The needles may also find a use in tip-enhanced Raman spectroscopy, a process in which molecular energy levels are measured by comparing the frequency of incident light with that of outgoing light.

To obtain quantitative values for the molecular energy levels, one needs to have molecular orbitals that are such that the configuration interaction (CI) expansion converges fast towards the full CI limit.

IMPORTANCE The fundamental advantage of in vivo optical imaging is that it can directly provide "molecular" information, because the photon energies are in the range of molecular energy levels.

The effects of spatial dispersion on the optical properties of dielectric crystals, arising from the broadening of the molecular energy levels into energy bands by the intermolecular interaction, are discussed both in the microscopic and the macroscopic theory.

Symmetry properties, widely used for theoretical study of molecular energy levels or transition probabilities, are generally referred to the only invariance group of the molecule which is a group of isometrics in the frame of reference fixed with respect to the molecule.