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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
Pulsed single-mode laser ionization of hyperfine levels of zirconium-91 journal January 1988
Physics overview of AVLIS report February 1985
Radiative lifetimes, absorption cross sections, and the observation of new high-lying odd levels of ^238U using multistep laser photoionization* journal January 1976

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Related Subjects

-1
/204/
16000-19000
35000-37000
35904
36068
36344
53506
5607
5662
5666
5756
6511
91
ang
atom
atoms
autoionizing
avlis
beam
cm
efficient
energy
energy level
even-parity
excite
ionization
ionizing
irradiated
lambda
laser
laser beam
level
mass-selective
natural
odd-parity
photoionization
process
raise
raising
range
removed
resonance
resonant
selectively
selectively remove
selectively removed
three-photon
three-step
three-step photoionization
transition
wavelength
wavelengths
zirconium
zr