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Nuclear Spectroscopy & Imaging

Nuclear Spectroscopy & Imaging. Stephen Cramer UC Davis / LBNL. Nuclear Experiments. Nuclear Forward Scattering – NFS SR Perturbed Angular Correlation Nuclear Resonance Vibrational Spectroscopy. Nuclear Experiments. The trick. 70 psec. Signal. h . 153 nsec. Source. ~20 ns. ~133 ns.

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Nuclear Spectroscopy & Imaging

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  1. Nuclear Spectroscopy & Imaging Stephen Cramer UC Davis / LBNL

  2. Nuclear Experiments • Nuclear Forward Scattering – NFS • SR Perturbed Angular Correlation • Nuclear Resonance Vibrational Spectroscopy

  3. Nuclear Experiments • The trick 70 psec Signal h 153 nsec Source ~20 ns ~133 ns off on 3680 nsec

  4. Nuclear Lifetimes & Energies • What works

  5. Nuclear Forward Scattering • ferrocene

  6. Synchrotron Radiation Perturbed Angular Correlation (SRPAC)

  7. Synchrotron Radiation Perturbed Angular Correlation (SRPAC)

  8.   The NRVS Experiment 1 meV 1 eV 100 eV 70 psec … Signal h 153 nsec Source ~20 ns ~133 ns Detector: off on 3680 nsec

  9. FeNxHy Models HFe-N2 DFe-N2 N2 Fe-14N2H2 Fe-15N2H2 N2H2 Fe-14N2H4 Fe-15N2H4 N2H4

  10. Fe Protein NRVS [Fe4S4]2+ [Fe4S4]1+ • Any redox level • Low frequency modes • Quantitative simulation [Fe4S4]0

  11. Nuclear Needs • Nuclear Forward Scattering – NFS • SR Perturbed Angular Correlation • Nuclear Resonance Vibrational Spectroscopy

  12. X-Ray Microtomography Image of yeast cell Carolyn Larabell - NIH funded facility at ALS

  13. Diffraction-Enhanced Imaging • x http://www.iit.edu/~chapman/AAPM/sld027.htm

  14. ‘Nuclear contrast’ • Mössbauer cross sections are 500 x photoelectric c. s. • but linewidths are 108 smaller • Why do it? • less radiation damage • zero background D 500 D

  15. Nuclear Imaging • Fe • Kr / Xe • Lanthanide nanoparticle tags

  16. Nuclear Imaging Needs • Orders of magnitude more flux • Higher energies (30-70 keV) • Nano eV (nuclear) monochromators • Suitable bunch schemes • Better (picosecond) detectors

  17. Nuclear Future? • I dream of things that never were … and say why not ? (RFK) • To accomplish great things, we must not only act, but also dream; not only plan, but also believe. (Anatole France)

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