Sacha Schiffmann
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View article: Lifetimes of excited states in Rh-
Lifetimes of excited states in Rh- Open
The radiative decay of excited states of the negative ion of rhodium, Rh$^-$, has been investigated experimentally and theoretically. The experiments were conducted at the Double ElectroStatic Ion Ring Experiment (DESIREE) facility at Stoc…
View article: Relativistic radial electron density functions and natural orbitals from GRASP2018
Relativistic radial electron density functions and natural orbitals from GRASP2018 Open
A new module, RDENSITY, of the GRASP2018 package [1] is presented for evaluating the radial electron density function of an atomic state described by a multiconfiguration Dirac-Hartree-Fock or configuration interaction wave function in the…
View article: Atomic Structure Calculations of Landé g Factors of Astrophysical Interest with Direct Applications for Solar Coronal Magnetometry
Atomic Structure Calculations of Landé g Factors of Astrophysical Interest with Direct Applications for Solar Coronal Magnetometry Open
We perform a detailed theoretical study of the atomic structure of ions with ns 2 np m ground configurations and focus on departures from LS coupling, which directly affect the Landé g factors of magnetic dipole lines between levels of the…
View article: Computational Atomic Structures Toward Heavy Element Research
Computational Atomic Structures Toward Heavy Element Research Open
We are interested in complex electronic structures of various atomic and ionics systems. We use an ab initioapproach, the multiconfigurational Dirac-Hartree-Fock (MCDHF), to compute atomic structures and properties.We contribute in three m…
View article: Natural orbitals in multiconfiguration calculations of hyperfine-structure parameters
Natural orbitals in multiconfiguration calculations of hyperfine-structure parameters Open
We are reinvestigating the hyperfine structure of sodium using a fully\nrelativistic multiconfiguration approach. In the fully relativistic approach,\nthe computational strategy somewhat differs from the original nonrelativistic\ncounterpa…
View article: Coulomb (Velocity) Gauge Recommended in Multiconfiguration Calculations of Transition Data Involving Rydberg Series
Coulomb (Velocity) Gauge Recommended in Multiconfiguration Calculations of Transition Data Involving Rydberg Series Open
Astronomical spectroscopy has recently expanded into the near-infrared (nIR) wavelength region, raising the demands on atomic transition data. The interpretation of the observed spectra largely relies on theoretical results, and progress t…
View article: Benchmarking Atomic Data from Large-scale Multiconfiguration Dirac–Hartree–Fock Calculations for Astrophysics: S-like Ions from Cr ix to Cu xiv
Benchmarking Atomic Data from Large-scale Multiconfiguration Dirac–Hartree–Fock Calculations for Astrophysics: S-like Ions from Cr ix to Cu xiv Open
We present a consistent set of calculated energies and E1, M1, E2, M2 radiative transition data for the main n = 3 levels from the 3 s 2 3 p 4 , 3 p 6 , , , , , and configurations for S-like ions from Cr ix to Cu xiv . The fully relativist…