Abstract
Xenon is well known to be a monoatomic gas. However, when the material system is «bathing» in the radiation field—a conventional electromagnetic field—all observed spectroscopic phenomena (absorption and emission intensities as a function of gas pressure, band shapes as well as fluorescence lifetimes) are consistent with a «molecular» description of the system. Experimental observations also rule out any significant influence of excited atomic species, three-body collision processes or pre-existing xenon molecules on the observed phenomena. This paradox is discussed on phenomenological grounds by assuming that the radiation field necessarily plays a fundamental part in the diatom chemical collision; the reaction pathway is investigated in both the entropyvs. time and potential-energy diagrams. It is believed that this treatment may be applied to any pairwise material system (A+B+hv), where A and B may be atoms or molecules «bathing» in the radiation field, whatever its intensity.
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