Electronic Energy Transfer Phenomena in Rare Gases

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  • Aharon Gedanken
    Departments of Chemistry and Physics, Tel-Aviv University, Tel-Aviv, Israel
  • Joshua Jortner
    Departments of Chemistry and Physics, Tel-Aviv University, Tel-Aviv, Israel
  • Baruch Raz
    Departments of Chemistry and Physics, Tel-Aviv University, Tel-Aviv, Israel
  • Abraham Szöke
    Departments of Chemistry and Physics, Tel-Aviv University, Tel-Aviv, Israel

抄録

<jats:p>In this paper we present the results of an experimental study of electronic energy transfer in xenon-argon, krypton-argon, and xenon-krypton gaseous mixtures excited by a pulsed electric discharge. Spectroscopic evidence for electronic energy transfer is based on the decrease in the intensity of the vacuum ultraviolet emission of the excited diatomic homonuclear rare gas molecules in the presence of small amounts (10–1000 ppm) of a foreign rare gas atom, while the visible emission spectrum of the host gas is parctically unmodified under these conditions. The relative contributions of two energy transfer mechanisms involving atom-atom and molecule-atom energy transfer were established by a kinetic analysis of the dependence of the energy transfer efficiency on the host pressure. We have determined the cross sections for energy transfer from the lowest metastable Ar and Kr excited states, and from the lowest excited state of Ar2* and Kr2* to ground state Xe, and from metastable excited Ar and from Ar2* to ground state Kr. The molecule-atom energy transfer process is characterized by large ∼ 10−14 cm2 cross sections. A simplified theoretical treatment of excited molecule-ground state atom collisions provides a proper rationalization of these large cross sections in terms of long range dipole-dipole coupling.</jats:p>

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