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A temperatdre jump apparatds IS aescribed which is based ma'n y on commercially available components. TemperatJre jumps Of aOOUt 2 'C n aboLr 1 5 0~ of aqJe0-s solut'ons can oe produced w thin 10 ps by absorption of the nlrared radiation of a pulsed atom c iod ne aser. The I me range available for I( net c experiments :s aboJt 30 ps to 1 s. Tne necessaw moa fications 01 tne commercial iodine laser are discussed A prom nent IeatJre of the apparatds s the very hign sensit vity of the spectropnotometric detection system in the visible spectra range Signa -to-noise ratios of u p to 2 x 10' are reached at a time reso Jtion of 1 ps A metnod is described to aeterm ne tne size 01 the temperature .-mp of each ina vidLal exper ment. Thus not only the relaxation I mes wh.ch are ndependent of the s ze of sma I IemperatLre jumps. can be evaluatea OJI a so the corresponding relaxation amp IlJdeS can be determ ned in a precise manner FLrtnermore. an effective metnod to recyc e the .aser medium I-C,F,I IS describea.

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