Resonant Auger decay of Ar 2p{sub 3/2}{sup -1}4s and 2p{sub 3/2}{sup -1}4p states excited by electron impact

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.032508· OSTI ID:21450543

Paripas, B; Palasthy, B; Stuhec, M; Zitnik, M ^[1]

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1. Department of Physics, University of Miskolc, H-3515 Miskolc-Egyetemvaros (Hungary)

Auger spectra of resonantly excited 2p{sub 3/2}{sup -1}4s and 2p{sub 3/2}{sup -1}4p states in argon were measured by (e,2e) technique. The 99.2-eV scattered electrons were detected in coincidence with L{sub 3}-M{sub 23}M{sub 23} Auger electrons, and the experiment was performed at 343.6- and 344.9-eV electron impact to tune the energy loss to the energy of the dipole-allowed and the dipole-forbidden excitations, respectively. The resonant Auger spectra are obtained upon subtraction of the overlapping signal due to the outer-shell ionization, which was recorded at 340-eV electron-impact energy. The most intense groups of Auger transitions from 2p{sub 3/2}{sup -1}4s (J=1,2) and 2p{sub 3/2}{sup -1}4p (J=0,1,2,3) states are identified by comparison with the results of the two-step model, based on distorted-wave Born approximation with exchange and multiconfiguration descriptions of the relaxed states. The 4 s spectrum displays a substantially larger shake-up contribution than the one observed in photoexcitation experiments, which may be explained by the interference of the resonant decay path with the direct ionization excitation of the Ar 3p subshell. The majority of the observed 4p signal is assigned to the monopole and quadrupole excitations of the ground state.

• OSTI ID: 21450543
• Journal Information: Physical Review. A, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevA.82.032508; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON
AUGER EFFECT
COINCIDENCE SPECTROMETRY
COMPARATIVE EVALUATIONS
DWBA
ELECTRON SPECTRA
ELECTRON-ATOM COLLISIONS
ELECTRONS
ENERGY LOSSES
EV RANGE
EXCITATION
EXCITED STATES
GROUND STATES
INTERFERENCE
IONIZATION
MULTIPOLE TRANSITIONS
APPROXIMATIONS
ATOM COLLISIONS
BORN APPROXIMATION
CALCULATION METHODS
COINCIDENCE METHODS
COLLISIONS
COUNTING TECHNIQUES
ELECTRON COLLISIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVALUATION
FERMIONS
FLUIDS
GASES
LEPTONS
LOSSES
NONMETALS
RARE GASES
SPECTRA