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Theo J.M. Zouros University of Crete/FORTH – Heraklion GREECE

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1 Theo J.M. Zouros University of Crete/FORTH – Heraklion GREECE
Isoelectronic study of triply- 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 R-matrix calculations
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 Production of triply-excited Li-like states
Cubaynes et al PRL 1996 2Pe Photoionization: γ + 1s22p 2P0 1s2l 3,1L + e-(εℓ) RES: e- + 1s2s 3Se 2s2p2 2De 1s2l 3,1L + e-(εℓ) Resonant Electron Scattering 2s22p 2Po 2s2p2 2De, 2Se, 2Pe 2p3 2So 1s22p 2Po 1s2p 3,1Po 1s2s 3Se 1s2s 1Se ALS synchrotron – Γ=39meV Foil excitation 1s2 1Se 671 nm cw dye laser He-like ions Z=5-9 1s22s 2Se Lithium -like

4 E1 E0 En h Aq-1+ Electron - ion collisions: Production and decay of doubly excited states radiative stabilization recombination DR or RTEX Aq+ E1 E0 En doubly-excited intermediate state RTE Aq-1+ Ee (quasi-)free electron E1-E0 E1 E0 En Bn E1 E0 En 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 Gas in Pressure Gauge electrons PSD X-Position Y- Position Timing Outer hemisphere θ e- Resolution ~ 0.1% ΔΩ = 1.8 x 10-4 sr 00 dgrs Ion

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

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 2s2p2 2D state 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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