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Efficient mass-selective three-photon ionization of zirconium atoms

Patent ·
OSTI ID:869673
 [1]
  1. San Ramon, CA
+ Show Author Affiliations
In an AVLIS process, .sup.91 Zr is selectively removed from natural zirconium by a three-step photoionization wherein Zr atoms are irradiated by a laser beam having a wavelength .lambda..sub.1, selectively raising .sup.91 Zr atoms to an odd-parity E.sub.1 energy level in the range of 16000-19000 cm.sup.-1, are irradiated by a laser beam having a wavelength .lambda..sub.2 to raise the atoms from an E.sub.l level to an even-parity E.sub.2 energy level in the range of 35000-37000 cm.sup.-1 and are irradiated by a laser beam having a wavelength .lambda..sub.3 to cause a resonant transition of atoms from an E.sub.2 level to an autoionizing level above 53506 cm.sup.-1. .lambda..sub.3 wavelengths of 5607, 6511 or 5756 .ANG. will excite a zirconium atom from an E.sub.2 energy state of 36344 cm.sup.-1 to an autoionizing level; a .lambda..sub.3 wavelength of 5666 .ANG. will cause an autoionizing transition from an E.sub.2 level of 36068 cm.sup.-1 ; and a .lambda. .sub.3 wavelength of 5662 .ANG. will cause an ionizing resonance of an atom at an E.sub.2 level of 35904 cm.sup.-1.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
DOE Contract Number:
W-7405-ENG-48;
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Number(s):
US 5376246
OSTI ID:
869673
Country of Publication:
United States
Language:
English

References (4)

The first ionization potential of zirconium atoms determined by two laser, field‐ionization spectroscopy of high lying Rydberg series journal September 1986
Radiative lifetimes, absorption cross sections, and the observation of new high-lying odd levels of ^238U using multistep laser photoionization* journal January 1976
Pulsed single-mode laser ionization of hyperfine levels of zirconium-91 journal January 1988
Physics overview of AVLIS report February 1985

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5662
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