Resonance ionization mass spectrometry for high-resolution spectroscopy of rare isotopes
Conference
·
· Trans. Am. Nucl. Soc.; (United States)
OSTI ID:5655589
Laser-induced resonance ionization has resulted in single atom detection of a few elements and very sensitive detection of many others. It has been found to be particularly fruitful to combine resonance ionization with mass analysis of the resultant ions to form a technique labeled resonance ionization mass spectrometry (RIMS). In a typical RIMS experiment, a broadband tunable dye laser is used to ionize a particular element in the source chamber of a mass spectrometer (element selective ionization). Isotope ratio measurements are then made by mass dispersion of the ions in the mass spectrometer. Since the ionization is element selective, the isobaric interferences that often plague mass spectrometric analysis can be essentially eliminated. A single-frequency, tunable laser can also be used to effect photoionization, and high-resolution spectra can be acquired by sweeping the tunable laser through the atomic resonance of interest. Here again, the combination of photoionization with mass analysis of the ions is very advantageous. By tuning the mass spectrometer to transmit only the isotope of interest, high-resolution spectra of rare isotopes can be obtained without complete chemical or isotopic separation of the samples. To demonstrate the utility of this technique, we show that spectra of rare lutetium isotopes, present in our sample at concentrations of approx. 30 ppm, can be obtained with good signal-to-noise. Analysis of the hyperfine patterns of these spectra leads to values of nuclear parameters, some previously unknown.
- Research Organization:
- Los Alamos National Lab., NM
- OSTI ID:
- 5655589
- Report Number(s):
- CONF-860610-
- Conference Information:
- Journal Name: Trans. Am. Nucl. Soc.; (United States) Journal Volume: 52
- Country of Publication:
- United States
- Language:
- English
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