| 摘要 |
In an AVLIS process, 91Zr is selectively removed from natural zirconium by a three-step photoionization wherein Zr atoms are irradiated by a laser beam having a wavelength lambda 1, selectively raising 91Zr atoms to an odd-parity E1 energy level in the range of 16000-19000 cm-1, are irradiated by a laser beam having a wavelength lambda 2 to raise the atoms from an El level to an even-parity E2 energy level in the range of 35000-37000 cm-1 and are irradiated by a laser beam having a wavelength lambda 3 to cause a resonant transition of atoms from an E2 level to an autoionizing level above 53506 cm-1. lambda 3 wavelengths of 5607, 6511 or 5756 ANGSTROM will excite a zirconium atom from an E2 energy state of 36344 cm-1 to an autoionizing level; a lambda 3 wavelength of 5666 ANGSTROM will cause an autoionizing transition from an E2 level of 36068 cm-1; and a lambda 3 wavelength of 5662 ANGSTROM will cause an ionizing resonance of an atom at an E2 level of 35904 cm-1.
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