Den Annolen, der Ph?jsik zurn 200. Geburtstag gewidmet.A h s t ract. X synchroncously pumped modc-locked cavitj -dumped dye laser, which delivers ric.arly l!'i,riricr-limited output pril.ues with 20 W peak power, 600 ps pulsewidth and 1.5 GHz spectr;iI b:intlwidth is used to populirtc selected rovibronic levels in excited electronic states of alkali moleculcs.The I;mr induccrl fluorescence is filtered through a monochromator and the lifetimes of individunl rovibronic lcvcls nro determined N ith the singlo photon delayed coincidence technique. The influenco of tlift'crcnt perturbations on the lifctinies is investigated and discussed.Lcberisdaiieriiiessanaen an selektiv angeregten Molckiilniveaus .Inha1 tsii borsicht. Mit eincm synchron gepumpten modengekoppelten Farbstoffliiser, der fast Foiiric.rbegrc,nztc Piilso mit 20 W Spitzenleistnng, SOU PR Dnuer und 1.5 CHz spektraler Bmdbrcite licfert. werdcn einzelne Sch~~ingtings-Rotntioncl-Pu'ivciiiis in elektronisch nngeregtcn Zustlnden von Alkali-Dimercn selektiv bevolkert und ihre Imbensdiiuern mit Hilfc der Phobncnziihltechnik mit. vcrziigcrt,er Koinzidenz gemessen. Der EinfluB vcrschicdener molekularer Storungen (PrYdissoziation, SI'in-B;ilin-Roppliing) uuf die Lebensdauern inclividrieller Sivcaus wird rrntersiictit rind clir diirtcus gewonnencn Erkenntnisse dislrutiert.
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