Abstract
The high sensitivity of RIMS enables the precise determination of the first ionization potential of actinide elements with a sample size of ≤10 12 atoms. By multiple resonant laser excitation, the actinide atoms under investigation are ionized in the presence of an electric field, and the ions are mass-selectively detected in a time-of-flight spectrometer. The first ionization potential is obtained by scanning the wavelength of the laser used for the last excitation step across the ionization threshold W th—indicated by a sudden increase of the ion count rate—at various electric field strengths. Extrapolation of W th to electric field strength zero leads directly to the first ionization potential. The first ionization potentials (IP) of Am, Cm, Bk, Cf and Es were determined for the first time as IP Am=5.9736(3) eV, IP Cm=5.9914(2) eV, IP Bk=6.1979(2) eV, IP Cf=6.2817(2) eV, IP Es=6.3676(5) eV with samples of 10 12 atoms. Furthermore, the ionization potentials of Th, U, Np and Pu were remeasured.
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