Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

  • Section I: Nuclear Moments and Nuclear β-decays Studied by Polarization Phenomena
  • Published:

Radiation detected resonance ionization spectroscopy on208Tl and242fAm


An ultra-sensitive laser spectroscopic method has been developed for the hyperfine spectroscopy of short-lived isotopes far off stability produced by heavy ion induced nuclear reactions at very weak intensity (> 1/s). It is based on resonance ionization spectroscopy in a buffer gas cell with radiation detection of the ionization process (RADRIS). As a first on-line application of RADRIS optical spectroscopy at242fAm fission isomers is in progress at the low target production rate of 10/s. The resonance ionization has been performed in two steps utilizing an excimer dye laser combination with a repetition rate of 300 Hz. The first resonant step proceeds through terms which correspond to wavelengths of 466.28, 468.17 or 426.56 nm; the second non-resonant step is achieved with the 351 nm radiation of the excimer laser itself, running with XeF. The frequency scans of the tuneable dye laser at 466.28 and 468.17 nm exhibit broad resonance ionization signals, the latter with a large isotope shift between242fAm and243Am which is in accordance with the large quadrupole moment of the242fAm fission isomer.

This is a preview of subscription content, log in to check access.


  1. [1]

    C.E. Bemis, J.R. Beene, J.P. Yong and S.D. Kramer, Phys. Rev. Lett. 43 (1979) 1854.

  2. [2]

    M.W. Johnson, E.B. Shera, M.V. Hoehn, R.A. Naumann, J.D. Zumbro and C.E. Bemis Jr., Phys. Lett. B 161 (1985) 75.

  3. [3]

    E.W. Otten,Treatise on Heavy-Ion Science, Vol. 8, ed. D.A. Bromley (Plenum Press, New York, 1989) p.517.

  4. [4]

    W. Lauth, H. Backe, M. Dahlinger, I. Klaft, P. Schwamb, G. Schwickert, N. Trautmann and U. Othmer, Phys. Rev. Lett. 68 (1992) 1675.

  5. [5]

    H. Backe, Th. Blönnigen, M. Dahlinger, U. Doppler, P. Graffé, D. Habs, M. Hies, Ch. Illgner, H. Kunz, W. Lauth, H. Schöpe, P. Schwamb, W. Theobald and R. Zahn, Hyp. Int. 74 (1992) 47.

  6. [6]

    V. Metag, D. Habs and H.J. Specht, Phys. Rep. 65 (1980) 1.

  7. [7]

    H. Backe, W. Lauth, W. Achenbach, M. Hain, M. Hies, A. Scherrer, A. Steinhof, S. Tölg and S. Ziegler, Nucl. Instr. Meth. B 70 (1992) 521.

  8. [8]

    J. Cariou, P. Luc, Atlas du Spectre d'Absorption de la Molecule Tellure, Lab. Aime Cotton, Orsay, France (1980).

  9. [9]

    J.G. Conway, private communication (1984, 1991).

  10. [10]

    H. Kunz, Diplomarbeit, Universität Mainz, Germany (1992), unpublished.

  11. [11]

    Th. Arndt, H. Backe, P. Dyer, P.G. Eller, M.M. Fowler, A. Steinhof and J.B. Wilhelmy, Phys. Rev. A 38 (1988) 5084.

  12. [12]

    F. Ames, private communication (1992).

Download references

Author information

Additional information

Work supported by the Bundesministerium für Forschung und Technologie under contract 06 MZ 188 I.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Backe, H., Graffé, P., Habs, D. et al. Radiation detected resonance ionization spectroscopy on208Tl and242fAm. Hyperfine Interact 78, 35–45 (1993).

Download citation


  • Excimer Laser
  • Quadrupole Moment
  • Isotope Shift
  • Broad Resonance
  • Frequency Scan