Cluster formation and uranium photoionization in the afterglow of a pulsed hollow cathode lamp

نویسندگان

  • J. W. Neri
  • C. A. B. Silveira
  • N. A. S. Rodrigues
  • C. Schwab
  • R. Riva
  • M. G. Destro
چکیده

Uranium photoionization was observed in the afterglow of pulsed hollow cathode lamps illuminated by a dye laser tuned near the electronic transition around 591.5 nm ~L6 216 900 cm M 7!. The photoionization signal was used to monitor the time evolution of the ground state uranium vapor density in the cathode hole. Lifetimes over 1 ms were measured for the uranium vapor; that makes this device attractive for multistep photoionization spectroscopy. The obtained results lead to the conclusion that these long times are due to cluster formation in the afterglow. © 1998 American Institute of Physics. @S0034-6748~98!04302-0#

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تاریخ انتشار 1998