1 / 9

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

nitesh
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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?!

More Related