Techniques for the Investigation of Nonradiative Processes

  • U. M. Grassano
Chapter
Part of the NATO ASI Series book series (NSSB, volume 249)

Abstract

Nonradiative processes are generally studied by measuring the time delay of the emission or the change in the quantum yield that they introduce in the radiative processes. Nonradiative processes induced by external perturbations (concentration of defects, electric and magnetic fields, temperature...) are slower than the intrinsic processes. Among the latter are of particular interest, the intraconfigurational relaxations and the relaxations among the higher excited states of impurities and defects in ionic solids. The measurements of these processes has been made possible by the techniques of the ultrafast spectroscopy. Detailed description will be made of the techniques of pump and probe (with mode-locked lasers with picosecond and subpicosecond pulses), of streak camera and of phase correlation (with periodically modulated sources). Other nonradiative processes are excited by high energy photons. They produce the ejection from the sample of electrons (photoemission and Auger effect) or of atoms and ions related to the production of localized lattice defects.

Keywords

Pump Pulse Color Center External Perturbation Streak Camera High Excited State 
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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • U. M. Grassano
    • 1
  1. 1.Dipartimento di FisicaUniversità di Roma — Tor VergataRomaItaly

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