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VOLUME 43 (1986) | ISSUE 12 | PAGE 570
Laser resonant photoionization detection of traces of the radioactive isotope 221Fr in a sample
The hyperfine splitting oftheZ)2 line of the isotope22'Fr (TU2 = 4.8 min) has been measured. The ionization potential of the francium atom has been refined: Ej <4.154 eV. The experiments were carried out at a francium flux of 8 χ 102 isotopes/s from the sample. The sensitivity of the detection of Fr in a sample is 104 atoms.