It has long been recognized (1-3) that resonance states play an important role in determining the fate of energy deposited in inert gases by fast charged particles. Resonance states compete effectively in importance with metastable states because of their large oscillator strengths (and hence large initial yield) and because of the imprisonment of resonance photons which leads to an effective lifetime for these states which may be thousands of times larger than their natural lifetime. A proper analysis of the intensity and time dependence of escaping resonance radiation gives much information (3-4) about processes which may convert the energy stored in the resonance states to other excited species.2 Some of these are (i) three-body collisions involving a resonance-state atom and two ground-state atoms which lead to electronically excited diatomic molecules (3-4); (ii) inelastic two-body collisions between a resonance-state atom and a ground-state atom which may lead to another resonance state atom or to a metastable state atom (5); and (iii) two-body collisional transfer to impurity gases (2, 6, 7) which may lead to ionization or dissociation of the impurity, or to a fairly selective excitation of atomic or molecular states. A proper analysis of the intensity and the time dependence of resonance radiation also gives considerable information about the validity of spectral-line broadening theories in the wings of a line. It is the wings of the line that must be described correctly if spectral-line formation and radiation transfer are to be calculated accurately. The interpretation of the intensity of escaping resonance radiation is complicated by the fact that the time behavior depends not only on the geometry of the gas container but also upon the point of exit and the direction of propagation of the photons observed in the experiment. In general the observed time dependence is not exponential. Also, the widely used Holstein theory (8) has limitations related to the lifetime of the state, the range of pressures, and the container dimensions. In this talk a report was made on investigations of the following