Consequently, gases can be studied, but in most cases only electronic excitations are observed.

Photoionization is like electronic excitation; the main difference is that the upper state is an ion.

Much like electronic excitation, the nucleus will decay toward its ground state, releasing a high-energy photon at a number of possible, discrete energies.

Different electronic excitations within semiconductors are already widely used in lasers, electronic components, computers, to mention a few.

Their proposed mechanism involved electronic excitation at the contacts between the graphite particles and the anthracene molecules.

The motion of a monatomic gas is translation (electronic excitation is not important at room temperature).

Actually, electronic excitation doesn't even happen for helium at room temperature!

For example, Hirschmugl found that when certain vibrations of the adsorbate relax (decay), they create electronic excitations in the metal.

The response of condensed water to electronic excitations is of utmost importance for biological systems.

These cases always represent situations where interclass electronic excitations happen.