The unique wavelength-dependent resonance enhanced multiphonon ionization (REMPI) spectrum of a molecular species provides a means of selectively ionizing that particular species. Coupled with high sensitivity for the detection of any ions subsequently formed makes the REMPI technique attractive for trace analysis. REMPI 'fingerprints' of some aromatic molecules and their fragments have been recorded in a high vacuum quadrupole system and detection of aniline as an impurity in nitrobenzene has been demonstrated in a simple ion chamber with no mass selectivity.
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Marshall et al. (1991) studied this question.