Lineshapes and optical selectivity in high-resolution double-resonance ionization mass spectrometry |
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| Affiliation: | 1. Department of Urology, Taipei Veterans General Hospital, Taipei, Taiwan;2. Department of Urology, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwann;3. Shu-Tien Urological Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan;4. Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan;5. Department of Psychiatry, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan;6. Program in Molecular Medicine, School of Life Sciences, National Yang Ming Chiao Tung University, Taipei, Taiwan;7. Institute of Biopharmaceutical Science, School of Life Science, National Yang Ming Chiao Tung University, Taipei, Taiwan;8. Division of Urology, Department of Surgery, Taipei City Hospital, Zhongxiao Branch, Taipei, Taiwan |
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| Abstract: | Lineshapes expected in high-resolution double-resonance ionization spectroscopy are calculated using the density matrix formalism, integrated over experimentally realistic conditions including atomic velocity and angular distributions as well as laser intensity profiles. The results of these calculations are compared with experimental measurements on the system 4s2 1S0 → 4s4p 1P1 → 4s4d 1D1 → ion for calcium. The measurements of lineshape, with a dynamic range of >106, reveal and confirm subtle effects predicted by theory. These include the shape, position and intensity of the laser-induced structure in the spectra and the simultaneous presence of coherent and incoherent excitation processes. The calculations are able to accurately predict isotopic selectivities achieved in experimental resonance ionization measurements and are used to evaluate these values for the detection of minor calcium isotopes, including the radionuclide 41Ca. |
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