Atomic Cascade Computations

Atomic cascades are ubiquitous in nature and they have been explored within very different scenarios, from precision measurements to the modeling of astrophysical spectra, and up to the radiation damage in biological matter. However, up to the present, a quantitative analysis of these cascades often failed because of their inherent complexity. Apart from utilizing the rotational symmetry of atoms and a proper distinction of different physical schemes, a hierarchy of useful approaches is therefore needed in order to keep cascade computations feasible. We here suggest a classification of atomic cascades and demonstrate how they can be modeled within the framework of the Jena Atomic Calculator. As an example, we shall compute within a configuration-average approach the stepwise decay cascade of atomic magnesium, following a 1s inner-shell ionization, and simulate the corresponding (final) ion distribution. Our classification of physical scenarios (schemes) and the hierarchy of computational approaches are both flexible to further refinements as well as to complex shell structures of the atoms and ions, for which the excitation and decay dynamics need to be modeled in good detail.

Ultrafast quantum control of ionization dynamics

The unprecedented combination of transient absorption and ion mass spectroscopy with attosecond resolution is used to study and control the complex multidimensional excitation and decay cascade of an ultrafast Auger process in krypton.

Spectroscopic signatures of ligand field states in {RuII(imine)} complexes

Clear spectroscopic signatures of ligand field states in the MLCT decay cascade of trans-[Ru(L)4(NCS)2] (L = pyridine or 4-methoxypyridine) were found. (TD)DFT calculations reveal the presence of both MLCT and LMCT transient absorption bands.

Numerical Analysis on Decay Heat Power of Weapon-Grade Plutonium

In order to exactly master effect of plutonium material’s heat power on safety and reliability of nuclear weapon, weapon-grade plutonium(WgPu) was regarded as research object in this paper. According to its component, decay heat power of WgPu per kilogram was calculated through dynamic decay cascade and decay law of plutonium. The maximum decay heat power of WgPu is 2.6158 watt per kilogram at seventy years.

Numerical Analysis on Decay Heat Power of Weapon-Grade Uranium and Depleted Uranium

In order to exactly master effect of uranium material’s heat power on safety and reliability of nuclear weapon, weapon-grade uranium(WgU) and depleted uranium(DU) were regarded as research object in this paper. According to their component, decay heat power of WgU and DU per kilogram was calculated through dynamic decay cascade and decay law of uranium. Decay heat power of WgU and DU was respectively 1.8152 and 0.4075 milliwatt per kilogram. Main nuclide influencing on decay heat power of WgU and DU is uranium-234(U-234).