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The Application of Resonant Multiphoton Ionization by Sub-picosecond Laser Pulses for Analytical Laser Mass Spectrometry

✍ Scribed by Christian Weickhardt; Carsten Grun; Ralf Heinicke; Anja Meffert; Jürgen Grotemeyer

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
112 KB
Volume
11
Category
Article
ISSN
0951-4198

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✦ Synopsis

Resonance-enhanced multiphoton ionization (REMPI) offers a number of advantageous features for the analysis of complex mixtures, e.g. the ability to ionize preselected compounds and to control the degree of fragmentation, and, for a large number of substances, a high ionization efficiency. These features require that the excited molecular state(s) involved in the MPI process are not significantly depleted during the duration of the laser pulse. For several groups of environmentally important molecules, such as metal organic compounds, this is not the case. In this work it is demonstrated that, for a number of such molecules, the interesting features of REMPI for analysis can largely be regained, for quickly relaxing systems, by the application of ultra-short laser pulses.

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