Abstract
Opto-galvanic or laser-enhanced ionization (LEI) spectroscopy has been performed on trace elements in a flame using one- and two-step laser excitations. The sensitivity, defined as the LEI signal divided by the laser pulse energy and the concentration of the trace element in the water solution aspirated into the flame, has been measured for a number of elements. A theoretical model for the LEI process has been developed and tested. The importance of energy levels, not involved in the laser transitions, is emphasized. The agreement between theory and experiment is satisfactory. Possible reasons for discrepancies which arise are discussed.
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