Modern laser and molecular beam techniques make feasible experimental studies of transition states in chemical reactions. Rough estimates of the signals to be expected under different circumstances are described. Several recent studies are discussed with comments on the type of information which can be obtained.
Resum6-Des lasers sont utilises pour sonder les especes transitoires qui existent pendant que les partenaires de r6action se transforment en produits de reaction dans une reaction chimique. Des faisceaux mol6culaires de K et NaCl se croisent B l1int6rieur de la cavite d'un laser h colorant continu et les photons absorb6s par les esp&ces transitoires permettent d'ouvrir la voie "chimi-luminescente" conduisant 2 la formation de KC1 et ~a * .
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