Ionization Potentials and Radii of Atoms and Ions of Element 105 (unnilpentium) and Ions of Tantalum Derived from Multiconfiguration Dirac-Fock Calculations

Fricke, B.; Johnson, Elijah; Rivera, Glorivee Martinez

doi:10.1524/ract.1993.62.12.17

Cited by 58 publications

(69 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 . This is in agreement with early relativistic calculations by Desclaux [94] and with a MCDF calculation by Fricke et al [112]. Thus, a significant contribution of the 7 p 1/2 state to the ground state is not expected for Db.…”

Section: According To the Glückauf Equation Of Chromatography The Elsupporting

confidence: 92%

Aqueous-phase chemistry of the transactinides

Kratz¹

2011

Radiochimica Acta

View full text Add to dashboard Cite

Rapid automated chemical separations / Liquid-liquid extraction / Ion exchange /Reversed-phase extraction chromatography / α-particle spectroscopy / Relativistic effects Summary. The experimental techniques developed to perform rapid chemical separations of the heaviest elements in the aqueous phase are presented. In general, these include transport of the nuclear reaction products to a separation device by the gas-jet technique and dissolution in an aqueous solution containing inorganic ligands for complex formation. The complexes are chemically characterized by a partition method which can be liquid-liquid extraction, ion-exchangeor reversed-phase extraction chromatography. The separated fractions are quickly evaporated to dryness for the preparation of samples for α-particle spectroscopy. Comments are given on the special situation in which chemistry has to be studied with single atoms. Theoretical predictions of chemical properties are compared to the presently known chemical behaviour of rutherfordium, Rf (element 104), dubnium, Db (element 105), seaborgium, Sg (element 106), and hassium, Hs (element 108) and to that of their lighter homologs in the Periodic Table in order to assess the role of relativistic effects in the chemistry of the heaviest elements.

show abstract

Section: According To the Glückauf Equation Of Chromatography The Elsupporting

confidence: 92%

Aqueous-phase chemistry of the transactinides

Kratz¹

2011

Radiochimica Acta

View full text Add to dashboard Cite

show abstract

“…This is in agreement with early relativistic calculations [92] and with a recent MCDF calculation [111]. Thus, a significant contribution of the 7p 1/2 state to the ground state is not expected for Db.…”

Section: Theoretical Predictionssupporting

confidence: 92%

“…Thus, a significant contribution of the 7p 1/2 state to the ground state is not expected for Db. Atomic and ionic radii and the first through fifth ionization potentials were calculated in [111]. Differences between the chemical behavior of Db and the extrapolated properties of an eka-tantalum could result from a larger ionic radius, a different effective charge, and a different radial extension of the 6d orbitals, which are most important in its molecular bondings [100,[110][111][112][113][114][115].…”

Section: Theoretical Predictionsmentioning

confidence: 99%

“…Differences between the chemical behavior of Db and the extrapolated properties of an eka-tantalum could result from a larger ionic radius, a different effective charge, and a different radial extension of the 6d orbitals, which are most important in its molecular bondings [100,[110][111][112][113][114][115]. Redox potentials were estimated for the group 5 elements, including the pseudohomolog Pa, on the basis of ionization potentials from MCDF calculations [111,116]. It was shown that the stability of the pentavalent state increases from V to Db, while the stability of the tetra-and trivalent state decreases.…”

Section: Theoretical Predictionsmentioning

confidence: 99%

See 1 more Smart Citation

Critical evaluation of the chemical properties of the transactinide elements (IUPAC Technical Report)

Kratz¹

2003

Pure and Applied Chemistry

View full text Add to dashboard Cite

Names of countries given after Members' names are in accordance with the IUPAC Handbook 1998Handbook -1999. Republication Abstract: In this paper, the chemical properties of the transactinide elements rutherfordium, Rf (element 104); dubnium, Db (element 105); and seaborgium, Sg (element 106) are critically reviewed. The experimental methods for performing rapid chemical separations on a time scale of seconds are reviewed, and comments are given on the special situation with the transactinides for which the chemistry has to be studied with single atoms. There follows a systematic description of theoretical predictions and experimental results on the chemistry of Rf, Db, and Sg-their mutual comparison and evaluation. The literature cited has the cutoff date of March 1999. The more recent chemical identification of bohrium, Bh (element 107), and of hassium, Hs (element 108), should be evaluated in a future Part II of this report.

show abstract

“…inner shell electrons 2 ). Furthermore, the precise determination of the first ionization potential of the actinides allows to test the predictions of multi-configuration DiracFock calculations 3 ).…”

Section: Introductionmentioning

confidence: 99%

First Determination of the Ionization Potential of Actinium and First Observation of Optical Transitions in Ferminm

Backe

Dretzke

Eberhardt

et al. 2002

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

For the detennination of the first ionization potential of actinium, 227Ac was electrodeposited on a Ta backing and covered with ---1 J.!m Zr. From this filament, Ac atoms were evaporated at 2 1250°C. By resonant excitation with UV light of 388.67 nm and subsequent excitation with light of ca 568 nm, Ac was ionized in an external electrical field.By determining the ionization thresholds as a function of the electrical field strength and by extrapolation to zero field strength, the first ionization potential of 43398(3) cm-1 == 5.3807(3) eV was measured. About 1 ng of 255Fm, half life 20.1 h, was prepared at ORNL by milking from 255Es produced in the High Flux Isotope Reactor and shipped to Mainz. Here, a fraction of 2.7 . 10 10 atoms was electrodeposited on a Ta backing and covered with ---1 11m Ti. From this filament, Fm atoms were evaporated at~1000°C in the buffer gas of an optical cell and resonantly excited and ionized with two beams of an excimer-dye-Iaser combination. The ions were identified by mass-selective detection employing the Ion-Guide-Quadrupole-Mass Separation (IGQMS) technique. Two resonant transitions were found at energies of25099.8 cm-1 and 25111.8 cm-I •

show abstract

Ionization Potentials and Radii of Atoms and Ions of Element 105 (unnilpentium) and Ions of Tantalum Derived from Multiconfiguration Dirac-Fock Calculations

Cited by 58 publications

References 16 publications

Aqueous-phase chemistry of the transactinides

Aqueous-phase chemistry of the transactinides

Critical evaluation of the chemical properties of the transactinide elements (IUPAC Technical Report)

First Determination of the Ionization Potential of Actinium and First Observation of Optical Transitions in Ferminm

Contact Info

Product

Resources

About