Search results for "Molar ionization energies of the elements"

showing 7 items of 7 documents

Determination of the first ionization potential of actinide elements by resonance ionization mass spectroscopy

1997

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, ne…

Chemical ionizationChemistrychemistry.chemical_elementThermal ionizationPhotoionizationMolar ionization energies of the elementsMass spectrometryAtomic and Molecular Physics and OpticsAnalytical ChemistryBerkeliumIonizationIonization energyAtomic physicsInstrumentationSpectroscopySpectrochimica Acta Part B: Atomic Spectroscopy
researchProduct

Determination of the first ionization potential of nine actinide elements by resonance ionization mass spectroscopy (RIMS)

1998

The high sensitivity of RIMS enables the precise determination of the first ionization potential of actinide elements with a sample size of ≤1012 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 Wth—indicated by a sudden increase of the ion count rate—at various electric field strengths. Extrapolation of Wth to electric field strength zero leads directly to the first ionization potent…

ChemistryMechanical EngineeringMetals and AlloysThermal ionizationPhotoionizationMolar ionization energies of the elementsIon sourceAtmospheric-pressure laser ionizationMechanics of MaterialsIonizationMaterials ChemistryAtomic physicsElectron ionizationAmbient ionizationJournal of Alloys and Compounds
researchProduct

<title>Collisional and thermal ionization of sodium Rydberg atoms in single and crossed atomic beams</title>

2006

The results of the experimental and theoretical study on associative ionization of laser excited Na Rydberg atoms in collisions with ground-state atoms and on thermal ionization by blackbody radiation in single and crossed effusive atomic beams are reported and discussed.

Condensed Matter::Quantum GasesChemical speciesChemistryExcited stateIonizationRydberg atomPhysics::Atomic and Molecular ClustersThermal ionizationPhysics::Atomic PhysicsMolar ionization energies of the elementsAtomic physicsAtmospheric-pressure laser ionizationIonSPIE Proceedings
researchProduct

Effect of melting on ionization potential of sodium clusters

2003

The effect of melting transition on the ionization potential has been studied for sodium clusters with 40, 55, 142, and 147 atoms, using ab initio and classical molecular dynamics. Classical and ab initio simulations were performed to determine the ionization potential of Na142 and Na147 for solid, partly melted, and liquid structures. The results reveal no correlation between the vertical ionization potential and the degree of surface disorder, melting, or the total energy of the cluster obtained with the ab initio method. However, in the case of 40 and 55 atom clusters, the ionization potential seems to decrease when the cluster melts.

Materials scienceBinding energyAb initioMolar ionization energies of the elementsAtomic and Molecular Physics and OpticsMolecular dynamicsChemical physicsAb initio quantum chemistry methodsIonizationPhysics::Atomic and Molecular ClustersCluster (physics)Physics::Atomic PhysicsAtomic physicsIonization energyThe European Physical Journal D - Atomic, Molecular and Optical Physics
researchProduct

First successful ionization of Lr (Z = 103) by a surface-ionization technique.

2013

We have developed a surface ionization ion-source as part of the JAEA-ISOL (Isotope Separator On-Line) setup, which is coupled to a He/CdI2 gas-jet transport system to determine the first ionization potential of the heaviest actinide lawrencium (Lr, Z = 103). The new ion-source is an improved version of the previous source that provided good ionization efficiencies for lanthanides. An additional filament was newly installed to give better control over its operation. We report, here, on the development of the new gas-jet coupled surface ion-source and on the first successful ionization and mass separation of 27-s (256)Lr produced in the (249)Cf + (11)B reaction.

Materials sciencechemistryIonizationThermal ionizationchemistry.chemical_elementActinideIonization energyAtomic physicsMolar ionization energies of the elementsInstrumentationIon sourceLawrenciumAtmospheric-pressure laser ionizationThe Review of scientific instruments
researchProduct

Resonant ionization spectroscopy of autoionizing Rydberg states in cobalt and redetermination of its ionization potential

2017

Multi-step resonance ionization spectroscopy of cobalt has been performed using a hot-cavity laser ion source and three Ti:Sapphire lasers. The photoionization spectra revealed members of five new autoionizing Rydberg series that originate from three different lower levels of 3d74s5s h4F9/2, 3d74s4d f4G11/2, and 3d74s4d f4H13/2 and converge to the first four excited states of singly ionized Co. The analyses of the Rydberg series yield 63564.689 �� 0.036 cm-1 as the first ionization potential of Co, which is an order of magnitude more accurate than the previous estimation. Using a three-step resonance ionization scheme that employs an autoinizing Rydberg state in the last transition, we obta…

Physics010308 nuclear & particles physicsPhotoionizationMolar ionization energies of the elementsCondensed Matter Physics01 natural sciencesAtomic and Molecular Physics and OpticsIon sourcesymbols.namesakeAutoionizationExcited stateIonization0103 physical sciencesPhysics::Atomic and Molecular ClustersRydberg formulasymbolsPhysics::Atomic PhysicsAtomic physicsRydberg state010306 general physicsJournal of Physics B: Atomic, Molecular and Optical Physics
researchProduct

Three-photon resonance ionization of atomic Mn in a hot-cavity laser ion source using Ti:sapphire lasers

2015

Three-photon resonance ionization of atomic manganese (Mn) in a hot-cavity ion source using Ti:sapphire lasers has been demonstrated. Three-step ionization schemes employing different intermediate levels and Rydberg or autoionizing (AI) states in the final ionization step are established. Strong AI resonances were observed via the 3d54s5s f 6S5/2 level at 49 415.35 cm−1, while Rydberg transitions were reached from the 3d54s4d e 6D9/2,7/2,5/2 levels at around 47 210 cm−1. Analyses of the strong Rydberg transitions associated with the 3d54s4d e 6D7/2 lower level indicate that they belong to the dipole-allowed 4d → nf 6F°9/2,7/2,5/2 series converging to the 3d54s 7S3 ground state of Mn II. Fro…

PhysicsThermal ionizationMolar ionization energies of the elementsCondensed Matter PhysicsAtomic and Molecular Physics and OpticsIon sourceAtmospheric-pressure laser ionizationsymbols.namesakeExcited stateIonizationRydberg formulasymbolsAtomic physicsElectron ionizationJournal of Physics B: Atomic, Molecular and Optical Physics
researchProduct