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Precision spectroscopy of HCI in a reaction microscope

Precision spectroscopy of HCI in a reaction microscope. C. Dimopoulou. Max-Planck-Institut für Kernphysik, Heidelberg. HITRAP Meeting, 26-28 May 2005, Munich. MPI-K Heidelberg @ HITRAP. Goal: study charge transfer processes in collisions between HCI and atoms/molecules/clusters.

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Precision spectroscopy of HCI in a reaction microscope

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  1. Precision spectroscopy of HCI in a reaction microscope C. Dimopoulou Max-Planck-Institut für Kernphysik, Heidelberg HITRAP Meeting, 26-28 May 2005, Munich

  2. MPI-K Heidelberg @ HITRAP Goal: study charge transfer processes in collisions between HCI and atoms/molecules/clusters Task: develop a reaction microscope (COLTRIMS spectrometer) Milestone: tests of the reaction microscope with light HCI

  3. Extraction of HCI from the HD-EBIT example: 3104 Kr30+ ions/s count rate magnetic field  sqrt(M/q), [arb.units] ion beam size: ~5 mm (FWHM)

  4. Target Jet HCI Beam Ion Detector Cold atomic/molecular target HCI beam E~keV/u position sensitive detectors E-field recoil target ions E-field Scattered projectile Projectile detector Reaction Microscope Coincident measurement of momentum vectors of charged collision fragments

  5. He target HCI beam EBIT Target Jet HCI beam PSD E-field Projectile detector Extraction of HCI (e.g. Ne10+, Ar18+, Kr34+, U64+,Xe54+) recoil ions E-field recoil ion detector PSD t • TOF: • target ion charge • state • long. momentum He+ • Position: • trans. momentum He2+ Tests with HCI from the EBIT: The electron capture experiment

  6. He target HCI beam PSD E-field recoil ions E-field PSD t • TOF: • target ion charge • state • long. momentum He+ • Position: • trans. momentum He2+ Tests with HCI from the EBIT: The electron capture experiment

  7. Ne6+ f p 9 keV/q Ne7+ p p i D p p Q p vP = 0.36 a.u. He+ Q ppi p ^ r  p r = - p = Q / v - v /2 p r|| p p r Electron capture: Precision spectroscopy

  8. 0,4 mrad 0,3 mrad / Q 0,2 scattering angle Scattering angle / 0,1 HITRAP: ultimate Q-value resolution pr|| Q /vp 0,0 10 20 30 40 50 60 70 Q - value / eV Q - value / eV capture into n=4 1500 1500 3 2s4s S 1,3 1 2s 4 L l 2s4p P x10 1000 1000 Projectile excitation counts 2p 3 l counts counts counts 3 2s4d D FWHM 0.72 eV 1 2s4d D 1 500 2s4s S 500 2s 3 l 0 0 10 20 30 40 50 60 70 15 16 17 18 19 20 21 22 23 24 25 Q - value / eV Q - value / eV Q value / eV Q value / eV Electron capture: Precision spectroscopy • excellent resolution: 0.7eV FWHM • excellent precision: 3-100 meV • many states resolved simultaneously • no selection rules

  9. Q value (eV) : Q = Ebf - Ebi Single electron capture in 12 keV/q Ar16+-He collisions cross section (arb.u.) scattering angle (mrad) Dynamics cross section (arb.u.) Structure Q-value (eV)

  10. From light to heavy HCI ?

  11. First capture experiment with U64+ ions Q value (eV) : Q = Ebf - Ebi 14 keV/q U64+ (103-104 ions/s) on He cross section (arb.u.) scattering angle (mrad) Dynamics cross section (arb.u.) Structure

  12. The HITRAP reaction microscope Increased Acceptance for recoil ions: large ion detector (MCP) with hole in preparation

  13. Summary & Outlook EBIT Target: gas-jet HCI beam Projectile detector • Reaction microscope: • ready and tested in EC • experiments with HCI • from the EBIT recoil ion detector • Systematic study of EC for bare noble gas ions up to Xe54+ on He • Collaboration with S.Knoop, Groningen • Future: • Installation at HITRAP

  14. Auger cascades X-rays E~keV/u <~~~~~~~~~ Reaction microscope HCI Target Studies with HCI at HITRAP HCI from HITRAP Formation of ”hollow atoms” t ≈ 1 fs Questions: • Precision Spectroscopy • Dynamics of formation: • many-electron flux • 3. Rearrangement processes  Coincident detection of ions, electrons and photons

  15. People Max-Planck Institut, Heidelberg R. Moshammer, J. R. Crespo Lopez-Urrutia, D. Fischer, C. Dimopoulou, T. Ferger, G. Sikler, H. Tawara, A. Gonzalez, R. Soria, G. Brenner, J. Braun, H. Bruhns, B. Feuerstein, J. Ullrich Former collaborators V. Mironov, C. Osborne, A. Lapierre, M. Trinczek KVI, Groningen S. Knoop, R. Hoekstra

  16. People

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