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Title: Efficient mass-selective three-photon ionization of zirconium atoms

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 [minus]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 [minus]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 [minus]1][lambda][sub 3] wavelengths of 5607, 6511 or 5756 [angstrom] will excite a zirconium atom from an E[sub 2] energy state of 36344 cm[sup [minus]1] to an autoionizing level; a [lambda][sub 3] wavelength of 5666 [angstrom] will cause an autoionizing transition from an E[sub 2] level of 36068 cm[sup [minus]1]; and a [lambda][sub 3] wavelength of 5662 [angstrom] will cause an ionizing resonance of an atom at an E[sub 2] level of 35904 cm[sup [minus]1]. 4 figures.
Inventors:
Issue Date:
OSTI Identifier:
6893271
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; EDB-95-027750
Patent Number(s):
US 5376246; A
Application Number:
PPN: US 7-984170
Contract Number:
W-7405-ENG-48
Resource Relation:
Patent File Date: 2 Dec 1992
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPES AND RADIATION SOURCES; ZIRCONIUM 91; LASER ISOTOPE SEPARATION; AUTOIONIZATION; EXCITATION; LASER RADIATION; MULTI-PHOTON PROCESSES; ELECTROMAGNETIC RADIATION; ENERGY-LEVEL TRANSITIONS; EVEN-ODD NUCLEI; INTERMEDIATE MASS NUCLEI; IONIZATION; ISOTOPE SEPARATION; ISOTOPES; NUCLEI; RADIATIONS; SEPARATION PROCESSES; STABLE ISOTOPES; ZIRCONIUM ISOTOPES 070100* -- Physical Isotope Separation