X-ray atomic absorption of cesium and xenon in the L-edge region

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.022513· OSTI ID:21448495

Kodre, A ^[1]; Padeznik Gomilsek, J ^[2]; Arcon, I ^[3]; Aquilanti, G ^[4]

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1. Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana (Slovenia)
2. Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor (Slovenia)
3. University of Nova Gorica, Vipavska 13, SI-5000 Nova Gorica (Slovenia)
4. Sincrotrone Trieste S.C.p.A s.s. 14, km 163.5, I-34149 Basovizza, Trieste (Italy)

X-ray absorption of atomic cesium is measured in the L-edge region, using a beryllium-window cell for cesium vapor. For comparison, absorption in Xe gas in the same energy region is remeasured with improved signal-to-noise ratio. By combining deconvolution and modeling, the edge profiles are studied to determine the threshold energies and the shape of the edge apex with exponential slope of the high-energy flank. In both elements, multielectron excitations show the same basic ordering in compact groups, largely independent of the core-hole subshell, following the energy sequence of coexcited valence and subvalence orbitals. The main effect of 6s electron in Cs, apart from 2(s,p)6s excitation, is the enhancement of single- as well as some multielectron resonant channels. The spectra of both elements show the ''polarization effect'': a convex basic curvature of the L{sub 2} and L{sub 3} segments, a concave L{sub 1} segment. Previously, Kutzner demonstrated a convincing theoretical explanation of the effect on Xe in a relativistic random-phase approximation with relaxation involving overlap integrals with continuum [Rad. Phys. Chem. 70, 95 (2004)].

• OSTI ID: 21448495
• Journal Information: Physical Review. A, Vol. 82, Issue 2; Other Information: DOI: 10.1103/PhysRevA.82.022513; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
ABSORPTION SPECTRA
BERYLLIUM
CESIUM
COMPARATIVE EVALUATIONS
ELECTRONS
EXCITATION
POLARIZATION
RANDOM PHASE APPROXIMATION
RELATIVISTIC RANGE
RELAXATION
SIGNAL-TO-NOISE RATIO
THRESHOLD ENERGY
VALENCE
VAPORS
X RADIATION
XENON
ALKALI METALS
ALKALINE EARTH METALS
APPROXIMATIONS
CALCULATION METHODS
DIMENSIONLESS NUMBERS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVALUATION
FERMIONS
FLUIDS
GASES
IONIZING RADIATIONS
LEPTONS
METALS
NONMETALS
RADIATIONS
RARE GASES
SORPTION
SPECTRA