1 / 22

Otto Stern (Sohrau 1888 – Berkeley 1969) Nobel Laureate 1943

Otto Stern (Sohrau 1888 – Berkeley 1969) Nobel Laureate 1943. Otto Stern, O.R. Frisch, I. Estermann (Hamburg, 1929-1933). He . NaCl(001).

oni
Download Presentation

Otto Stern (Sohrau 1888 – Berkeley 1969) Nobel Laureate 1943

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. Otto Stern (Sohrau 1888 – Berkeley 1969) Nobel Laureate 1943

  2. Otto Stern, O.R. Frisch, I. Estermann (Hamburg, 1929-1933) He NaCl(001)

  3. “These experiments are of interest not only because of their confirmation of the predictions of quantum mechanics, but also because they introduce the possibility of applying atom diffraction to investigations of the atomic constitution of surfaces.” (T. M. Johnson, Phys. Rev. 37 (1931) 847).

  4. Bound-state resonances Frisch-Stern (1933) I00 J. E. Lennard-Jones and A. F. Devonshire, Nature 137 (1936) 1069.

  5. Gas – Surface Interactions: - energy transfer - sticking (adsorption) INELASTIC SCATTERING INELASTIC RESONANCES Lattice vibrations (phonons) J.M. Jackson and N.F. Mott, Proc. Roy. Soc. A 137 (1932) 703: Quantum DWBA

  6. L.D. Landau, Phys. Z. Sowjet. 8 (1935) 489. B.L. Bonch-Bruevich, Usp. Fiz. Nauka 40 (1950) 369 Classical Rarified Gas Dynamics Supersonic Molecular Beams

  7. High-resolution diffraction Supersonic He-atom beam sources Time-of-flight spectroscopy

  8. J. P. Toennies: HUGO (MPI-SF, Goettingen)

  9. Angular distributions Diffraction Bound state resonances, etc.

  10. Time of Flight (TOF) Inelastic scattering Phonons via the mechanical action (Pauli repulsion) on the electron density Phonon dispersion curves Forces between atoms Forces between ions and electrons (electron-phonon interaction) & electronic susceptibility

  11. Surface waves Lord Rayleigh (1887) Irpinia 1980 (Polo Sismico Alberto Gabriele, FCCSEM Erice)

  12. Surface phonons 1: from 3D lattice to slab

  13. Surface phonons 2: from 2D monolayer to slab

  14. TOF spectrum Energy-transfer spectrum scan curves for 90° geometry

  15. HAS versus theory NaF(001) LiF(001) theory: Green Function surface dynamics + DWBA scattering theory

  16. Metals: Skin & Bones

  17. HAS  hole-electron pairs! 1D conductor electron-hole excitations Peierls instability

  18. The Helium-3 Spin-Echo Spectroscopy P. Fouquet, A.P. Jardine, S. Dworski, G. Alexandrowicz, W. Allison and J. Ellis "Thermal energy 3He spin-echo spectrometer for ultrahigh resolution surface dynamics measurements“ Rev. Sci. Inst. 76, 053109 (2005).

  19. The Cavendish He3 Spin-Echo Apparatus

  20. A first test for He3 Spin-Echo: Bound states of He3 on LiF(001) back to Frisch & Stern! A.P. Jardine, S. Dworski, P. Fouquet, G. Alexandrowicz, G.Y.H. Lee, D.J. Riley, J. Ellis, W. Allison, "Ultrahigh resolution spin-echo measurement of surface potential energy landscapes", Science 304, 1790-1793 (2004).

  21. cluster beam cluster assembled film Grenoble - 9 SUPERSONIC CLUSTER BEAM DEPOSITION at the Department of Physics, University of Milano TOF-MS CHAMBER DEPOSITION CHAMBER SOURCE CHAMBER quartz MB sample manipulator He line PMCS substrate time of flight mass spectrometer to pulsed power supply target 2000 l/s diff. pump 700 l/s diff. pump 500 l/s turbo pump

  22. something more in: Giorgio Benedek J. Peter Toennies Helium Atom Scattering Spectroscopy of Surface Phonons Springer-Verlag Berlin Heidelberg New York 2007

More Related