6533b853fe1ef96bd12add5e
RESEARCH PRODUCT
Determination of the first ionization potential of actinide elements by resonance ionization mass spectroscopy
G. HuberKlaus WendtS. KöhlerJ. V. KratzR. DeiβenbergerGerd PasslerJ. RiegelN. ErdmannKlaus EberhardtGünter HerrmannPushpa M. RaoM. NunnemannNorbert Trautmannsubject
Chemical ionizationChemistrychemistry.chemical_elementThermal ionizationPhotoionizationMolar ionization energies of the elementsMass spectrometryAtomic and Molecular Physics and OpticsAnalytical ChemistryBerkeliumIonizationIonization energyAtomic physicsInstrumentationSpectroscopydescription
Abstract Resonance ionization mass spectroscopy (RIMS) in the presence of an external static electric field has been used for the determination of photoionization thresholds. Extrapolation of the thresholds obtained with different electric field strengths to zero field strength directly leads to the first ionization potential (IP). The ionization potentials of the transplutonium elements americium, curium, berkelium and californium could be measured for the first time. Due to the high sensitivity of RIMS, samples of only 1012 atoms have been used. The results are: IPAm = 5.9738(2)eV, IPCm = 5.9915(2)eV, IPBk = 6.1979(2)eV and IPCf = 6.2817(2)eV. The same technique was applied to thorium, neptunium and plutonium, yielding IPTh = 6.3067(2)eV, IPNp = 6.2655(2)eV and IPPo = 6.0258(2)eV. Plotted as a function of the number of electrons N, the actinide ionization potentials can be approximated by two straight lines joining at the half-filled shell when normalized to ionization from the lowest fN s2 level to the lowest fN s level.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-06-01 | Spectrochimica Acta Part B: Atomic Spectroscopy |