The yields of multiple Xei+ ions produced by the cascade de-excitations L2 to N45 inner shell vacancies are calculated with inclusion every possible pathway deexcitation (Auger, Coster-Kronig and radiative) at each branching point trees. Ejections additional electrons through shake processes included step de-excitation. Good agreement experiment is obtained. Simplified de-excitation schemes suggested earlier other authors for initial M-shell discussed.

A review of experimental and theoretical studies the threshold photoionization heavier rare-gas atoms is presented, with particular emphasis on autoionization resonances in spectral region between lowest two ionization thresholds 2P3/2 2P1/2, accessed from ground or excited states. Observed trends positions, widths shapes depending atomic number, principal quantum number n, orbital angular momentum ℓ further numbers specifying fine- hyperfine-structure levels are summarized discussed light...

Abstract Final ion charge spectra produced by the cascade de-excitations of 1 s - to 5 p 3/2 -vacancies gold atom are calculated direct construction and analysis decay trees. The energies multivacancy configurations arising in course development, partial widths radiation radiationless transitions using Pauli–Fock approximation. as differences total initial final ionic which allowed excluding energy-forbidden numerous configurations. Partial expressed form that accounting for effect electron...

Cross sections and angular distributions of the photoelectron correlation satellites Xe atom , B M Lagutin, I D Petrov, V L Sukhorukov, S Whitfield, Langer, J Viefhaus, R Wehlitz, N Berrah, W Mahler, U Becker

Quantum mechanical interference between different pathways in inner-shell resonance excitation-deexcitation spectra is a realization of double-slit experiment on the atomic scale. If intermediate resonances are symmetries, this symmetry forbidden solid-angle-averaged or magic-angle-recorded deexcitation spectra. It has, however, been suggested that may by observable off-magic-angle-recorded Here, we prove angularly resolved 2σ(-1)2π(2)(2Δ,2Σ±) N*O quantitative comparison ab initio...

Angular distributions of the ${\text{CO}}^{+}(A\text{ }^{2}\ensuremath{\Pi})$ photoelectrons and }^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}X\text{ }{^{2}\ensuremath{\Sigma}}^{+})$ fluorescence are computed in vicinity $1{s}^{\ensuremath{-}1}{\ensuremath{\pi}}^{\ensuremath{\ast}}$ resonant excitation ${\text{C}}^{\ensuremath{\ast}}\text{O}$ molecule. In calculations, lifetime vibrational interference direct transition amplitude for population $A\text{...

The Kr 4s-electron photoionization cross section as a function of the exciting-photon energy in range between 30 eV and 90 was calculated using configuration interaction (CI) technique intermediate coupling. In calculations 4p spin-orbital corrections due to higher orders perturbation theory (the so-called Coulomb correlational decrease) were considered. Energies II states agree with spectroscopic data within less than 10 meV. For some new assignments suggested on basis largest component...

Absolute cross sections for the transitions of Kr atom into 4s1 and 4p4nl states Kr+ ion were measured in 4s-electron threshold region by photon-induced fluorescence spectroscopy (PIFS). The also calculated, as well 4p4nln'l' doubly excited states, frame LS-coupling many-body technique. doubly-excited atomic used to illustrate pronounced contributions latter photoionization process, evident from measurements. comparison theory experiment led conclusions about origin main features observed experiment.

The energy dependencies of alignment parameters A20 for KrII 4p(4)5p states after the Auger decay KrI 3d(9)np resonances were investigated theoretically and experimentally first time in Raman regime with bandwidth exciting radiation (deltaE(FWHM)=20 meV) smaller than natural width (Gamma approximately 80 meV). observed dependence is due to in-terference between different resonance channels direct photoionization channel. A strong both orientation parameter O10 photoelectron angular...

Photon-induced fluorescence spectroscopy was applied for the first time to investigate anisotropy of VUV radiation emitted from Kr II satellite states with total angular momentum after photoionization atom by linearly polarized synchrotron near 4s threshold. The measurements showed that sign alignment parameter is practically independent exciting-photon energy ionic state , whereas changes varying energy. Simple formulae connecting distribution and kinematics our experiment quantities...

Absolute Kr 4s-electron photoionization cross sections as a function of the exciting-photon energy were measured by photon-induced fluorescence spectroscopy (PIFS) at improved primary-energy resolution. The determined from threshold to 33.5 eV and 90 with primary-photon bandwidths 25 meV 50 meV, respectively. measurements compared experimental data selected theoretical calculations for direct sections.

Angular distributions of Auger electrons and subsequent fluorescence photons are studied theoretically experimentally in the vicinity core excitations NO. In calculations, lifetime vibrational interference electronic state were taken into account ab initio. The between excitation deexcitation amplitudes for transitions via symmetry-different intermediate resonances 1s−12π2(2Δ, 2Σ±), which is forbidden solid-angle-averaged or magic-angle-recorded decay spectra, plays a crucial role formation...

The effect of the polarization atomic core by outer electron on near-threshold photo-ionization alkali atoms (Na-Cs) and metastable rare gas (Ne*-Xe*) is investigated. variational principle applied to compute potential thereby obtain dipole polarizabilities ions. calculated considerably deeper inside than previously used potentials. Inclusion leads a better agreement cross sections with experimental data in threshold region, especially for atoms.

Using high-resolution laser photoelectron spectrometry we have determined for the first time absolute cross sections and electron angular distribution parameter one-photon ionization of metastable atoms to resolved ion states near threshold as well -parameter at , 257.25 nm. For comparison with present future experimental data calculated partial -parameters photoionization analogous alkali atom over energy range 0 - 10 eV. We used both a term-dependent Hartree Fock approach...

The energy dependence of the alignment parameter A20 for Kr II 4p45p(E 1J1) states following excitation in Raman regime with exciting-photon passing through I 3d9np resonances was investigated theoretically and experimentally. Interference between resonance direct photoionization channels explains on energy. Experimentally, determined after analysis 5p–5s fluorescence decay excited monochromatized synchrotron radiation. band pass radiation set to 10 meV which is smaller than natural width...

Interference between the direct and resonant amplitudes for population of CO+(A 2Π) state in vicinity O 1s → 2π excitation CO* is studied by an ab initio theoretical approach. The weak photoionization induces Fano–Shore-type profiles resulting long-range exciting-photon energy dependences computed angular distribution parameters photoelectrons, βeA(ω), subsequent 2Π X 2Σ+) fluorescence, β2XA(ω). In presence photoionization, lifetime vibrational interference causes substantial variations...

The lifetimes of the ns1 np6 2S1/2 states Ar II, Kr II and Xe were determined by measuring fluorescence decay curves after selective excitation with pulsed monochromatized synchrotron radiation. are = (4.684±0.019) ns, (30.78±0.17) (35.93±0.20) ns. Calculations performed within configuration interaction approach show strong dependence calculated on interaction. It is proposed to use precise lifetime values for a test future calculations effective value Coulomb electrons.

Theoretical results for the autoionization dynamics of 3p1/25nℓ' Rydberg states Ar atoms into 3p 3/25εℓ continua are presented ℓ' = 0–5. The quantum defects and reduced widths these resonances were calculated within configuration interaction Pauli–Fock approach including core polarization. most significant many-electron effects influencing decay polarization atomic by electron photoelectron, correlational decrease Coulomb between states. For 0, 2 4 (where reliable measurements exist)...

The 1s X-ray absorption spectra of atomic calcium, chromium, manganese and copper were determined experimentally calculated theoretically. are dominated by a prominent line at threshold which precedes smooth continuum extending to higher energies. Hartree-Fock calculations taking relativistic effects, relaxation term dependence into account describe the discrete resonance very well. resonances have no counterpart in metals. experimental atom metal core level binding energy shifts agree well...

With the aim of elucidating general trends for autoionizing decay Rydberg series Rg (ncp1/25nℓ'[K' = ℓ'±1/2]J) (Rg Ne, Ar, Kr, and Xe; nc 2-5), converging to fine-structure-excited ionization limit Rg+ (ncp1/25 2P1/2), we have carried out calculations resonance widths all ℓ'[K']J with ℓ' 0-5 within single-electron Pauli-Fock approach. The ℓ'-dependence reduced Γr n*3Γn (n* n-µℓ), which is independent n at large n, obtained, dominant paths are characterized. Based on these findings,...

The alignment of Kr II 4p45p (EJ) states after the Auger decay I 3d95/25p (J = 1) resonance was measured using photon-induced fluorescence spectroscopy (PIFS) and parameters A20 were calculated within stepwise model. Using same wavefunctions, angular distribution electrons also calculated. Good agreement with value published experimental values for βAug is obtained.

A high-resolution $4d$ photoelectron spectrum of Eu has been measured. The reveals a rich structure reflecting multiplet splitting due to $4d\ensuremath{-}4f,$ $4f\ensuremath{-}4f,$ and spin-orbit interaction. In order interpret the complex ${4d}^{\ensuremath{-}1}$ structure, calculations in intermediate coupling scheme were performed taking into account term-dependent lifetime width each state. strong influence both $4d\ensuremath{-}4f$ exchange interaction broadening on shape is...