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.
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Work supported by the Bundesministerium für Forschung und Technologie under contract 06 MZ 188 I.
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Backe, H., Graffé, P., Habs, D. et al. Radiation detected resonance ionization spectroscopy on208Tl and242fAm. Hyperfine Interact 78, 35–45 (1993). https://doi.org/10.1007/BF00568115
- Excimer Laser
- Quadrupole Moment
- Isotope Shift
- Broad Resonance
- Frequency Scan