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Production and Detection of Selectively Laser Ionized Species

  • F. Giammanco
Part of the Ettore Majorana International Science Series book series (EMISS, volume 54)

Abstract

Resonant multiphoton ionization is a general method either for analyzing the chemical composition of samples (trace analysis) or for inducing modification of isotopic natural abundance (isotope enrichment). Selectivity is achieved by a multiple-step process in which different laser beams are tuned to resonant transitions of the element of interest. Since the steps involved are, in general electric-dipole transitions, pulsed lasers are required to saturate resonant transitions and, thus, to achieve a high degree of ionization. The ions produced are accelerated by an external electric field, and then fed into a time-of-flight (TOF) mass spectrometer. This simple scheme can be applied to a wide range of molecular or atomic samples1, providing that the resonant transitions belong to a range of the electromagnetic spectrum in which laser sources are available. In the case of samples whose first resonant step is in the VUV region, e.g. noble gases, excitation by electron impact into metastable states may be combined with selective laser ionization2.

Keywords

External Field Resonant Transition Internal Field Collective Effect Needle Injector 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • F. Giammanco
    • 1
  1. 1.Dipartimento di FisicaUniversità di PisaPisaItaly

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