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In-Source Photoionization Spectroscopy: Methods of data analysis

In-Source Photoionization Spectroscopy: Methods of data analysis. M.D. Seliverstov. maxim.seliverstov@cern.ch. 1st LA³NET Topical Workshop on Laser Based Particle Sources. 20-22 February 2013   CERN. Contents:. Resonant photoionization in-source spectroscopy: advantages and limitations

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In-Source Photoionization Spectroscopy: Methods of data analysis

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  1. In-Source Photoionization Spectroscopy: Methods of data analysis M.D. Seliverstov maxim.seliverstov@cern.ch 1st LA³NET Topical Workshop on Laser Based Particle Sources 20-22 February 2013  CERN

  2. Contents: • Resonant photoionization in-source spectroscopy: advantages and limitations • General problems of data analysis (isotopes with I = 0) Correction to the laser power Laser lineshape asymmetry • Isotopes with I > 0: hyperfine splitting Relative intensities of hfs lines Saturation hfs levels population redistribution • Conclusions and outlook 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  3. Resonant photoionization in-source spectroscopy Isotope shift dnA,A’ dnA,A’ =FlA,A’+MS Rms charge radius lA,A’= dr2A,A’+C2dr 4A,A’+ … = 0.93 dr2A,A’ • Relative line position  hyperfine constants A & B mI, QS Laser linewidth about 1 GHz Doppler limitation: For Pb isotope chain: For 208Pb at TLIS = 2000K: dnA,A+1= 1 GHz D = 2.4 GHz (FWHM) 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  4. Resonant photoionization in-source spectroscopy Spectra of even-A isotopes of Pb and Po 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  5. Fitting function The simplest case: (Voigt profile) General form: Saturation is possible Laser lineshape can be an asymmetrical function 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  6. Asymmetry of the fitting function “standard” Lorentzian: “deformed” Lorentzian: 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  7. Additional correction to asymmetry of the lineshape 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  8. Correction to the laser power Optical transition saturation Working area 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  9. Saturation broadening 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  10. Saturation + desynchronization of the laser pulses Dye lasers with CVL pumping Dye lasers with Nd:YAG pumping: No timing problems Ti:Sa – timing problems again 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  11. Corrections for desynchronization 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  12. Corrections for desynchronization 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  13. Hyperfine splitting (hfs) Photoionization scheme for Pb 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  14. Hyperfine splitting (hfs) 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  15. Hyperfine splitting (hfs) Photoionization scheme for Po 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  16. Hyperfine splitting (hfs) Position of the hfs lines: Relative intensities (simplified form): 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  17. Hyperfine splitting (hfs) 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  18. Rate equations To take into account the saturation of transitions, pumping processes between hyperfine structure (hfs) components and a population redistribution of the hfs levels the number of photoionsNion for each frequency step was calculated by solving the rate equations for the given photoionization scheme: At t = 0: 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  19. Rate equations Nion ionization W ion F’’2 N’’F’’ F’’1 F’’0 W F’F’’ W F’’ F’ F’2 N’F’ F’1 F’0 W FF’ W F’F F2 NF F1 F0 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  20. King plot for Po isotopes 200–210Po King plot for Po atomic transitions 843 nm (our data) and 255 nm. 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  21. Charge radii of Po isotopes 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  22. Rate equations for the polarized light F = 1/2F’ = 3/2 MF’ -3/2 -1/2 1/2 3/2 MF -1/2 1/2 Q = MF – M’F 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  23. Rate equations for the polarized light F = 1/2F’ = 3/2 MF’ -3/2 -1/2 1/2 3/2 Linear polarization MF -1/2 1/2 Q = MF – M’F 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  24. Universal fitting program 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

  25. Conclusions The laser ion source is not only a very effective in its normal use as an element-selective tool for producing intense ion beams, but it can be used as a very powerful atomic-spectroscopy tool due to the resonance character of the photoionization (In-Source Laser Resonant Photoionization Spectroscopy). In contrast to other laser spectroscopic techniques, in that case the laser frequency scanning procedure is applied directly within the mass-separator ion source. The main advantage of this technique is its very high sensitivity, nevertheless its spectral resolution is Doppler-limited, therefore the accurate data analysis is of great importance.

  26. Thanks for your attention! 1st LA³NET Topical Workshop on Laser Based Particle Sources, 20-22 February 2013, CERN

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