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Isoelectronic study of triply- excited Li-like electron scattering resonances

Isoelectronic study of triply- excited Li-like electron scattering resonances. Theo J.M. Zouros University of Crete/FORTH – Heraklion GREECE. Recent collaborators. J.R. Macdonald Lab Kansas State Univ. Dr. Manolis Benis PhD 2001 Univ. of Crete & JRM. Prof. Tom Gorczyca

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Isoelectronic study of triply- excited Li-like electron scattering resonances

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  1. Isoelectronicstudy oftriply- excited Li-like electron scattering resonances Theo J.M. Zouros University of Crete/FORTH – Heraklion GREECE 4th annual LEIF meeting - Belfast June 29, 2003

  2. Recent collaborators J.R. Macdonald Lab Kansas State Univ. Dr. Manolis Benis PhD 2001 Univ. of Crete & JRM Prof. Tom Gorczyca Western Michigan Univ. R-matrix calculations Prof. Pat Richard Mikhail Zamkov Grad Student

  3. 2Pe RES: e- + 1s2s 3Se2s2p22De 1s2l 3,1L + e-(εℓ) 2p32So 2s2p22De,2Se, 2Pe 2s22p 2Po 1s2s 1Se 1s2s 3Se 1s22p 2Po Cubaynes et al PRL 1996 Production of triply-excited Li-like states Photoionization: γ + 1s22p 2P01s2l 3,1L + e-(εℓ) Resonant Electron Scattering 1s2p 3,1Po ALS synchrotron – Γ=39meV Foil excitation 1s21Se 671 nm cw dye laser He-like ions Z=5-9 1s22s 2Se Lithium -like

  4. Aq-1+  En Aq-1+ (quasi-)free electron Ee E1   h Bn En En E0 E1 E1 Aq+ E1-E0  E0 E0 doubly-excited intermediate state RTE En E1 E0 radiative stabilization recombination DR or RTEX Electron - ion collisions: Production and decay of doubly excited states Aq+ capture of a (quasi-) free electron + excitation inverse autoionization autoionization Resonant electron scattering RES or RTEA Ee + Bn = E1-E0

  5. UoC HEMISPHERICAL ANALYZER WITH 2-D PSD 0o ELECTRON SPECTROMETER Faraday Cup Ion Beam 4-element lens Inner hemisphere Gas Cell Pressure Gauge Gas in electrons PSD X-Position Y- Position Timing Outer hemisphere e- θ Resolution ~ 0.1% ΔΩ = 1.8 x 10-4 sr 00 dgrs Ion

  6. Elastic scattering of quasi-free electrons on B3+ ions 2s2p2 2D 1s2p 3P RTEA 1s2s 3S M. Zamkov et al. Phys. Rev A 65, 032705 (2002) E.P. Benis et al, in XXI ICPEAC, Sendai, Japan, p. 505 (1999) Triply Excited States !

  7. Resonant electron scattering R-matrix calculation

  8. First Z-dependence study of a triply-excited state Benis et al. submitted PRL June 2003

  9. Summary and Conclusion • Isoelectronic investigation of the scattering properties of • the triply-excited 2s2p22Dstate for He-like B, C, N, O, F • in collisions with H2 • Resonant electron scattering R-matrix calculations within • the electron scattering model (impulse approximation) • found to be in good agreement with experiment • Scattering techniques still the only way to obtain • information about resonances for HCI with Z>3 • - Free electron laser is expected to change this • but still need about 10 years?!

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