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Near Resonance Interactions between Stark Components of the 6H5/2 and 4G5/2 States of Sm3+ in POCl3:SnCl4

  • J. Chrysochoos
  • P. Tokousbalides

Abstract

Light excitation of Sm3+ ions in POCl3.:SnCl4 leads to fluorescence emission arising exclusively from the lowest excited state of Sm3+, namely the 4G5/2-state. The fluorescence lifetime of the 4G5/2-state of Sm3+ in POCl3:SnCl4 is fairly long (1), approaching 3.3 msec at very low [Sm3+] in contrast to the relatively short lifetimes of Sm3+ (4G5/2) observed in such solvents as CH3OH, C2H5OH, C3H7OH and H2O. Values of τfl equal to 10.5, 10.0, 9.0 and < 3.0 μsec have been reported for Sm3+ in these latter solvents (2). The fluorescence lifetime and quantum yield of the 4G5/2- state of [Sm3+] in POCl3:ZrCl4 and POCl3:TiCl4 decrease with increasing [Sm3+] due to the self-quenching (1,3) of the 4G5/2 by the 6H5/2-state of Sm3+. In addition, the fluorescence is quenched by the solvent, ksol, whose maximum value is 320 sec−1 (4). The temperature dependence of the self-quenching process of the 4G5/2- state of Sm3+ will be discussed in this article. Experimental details regarding this study were given elsewhere (2,3,5).

Keywords

Fluorescence Lifetime Infrared Absorption Resonance Interaction Lower Excited State Infrared Absorption Band 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • J. Chrysochoos
    • 1
  • P. Tokousbalides
    • 1
  1. 1.Department of ChemistryUniversity of ToledoToledoUSA

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