Abstract
Picosecond spectroscopy has been utilized to study ultrafast molecular processes occurring on a picosecond time scale. The experimental system for generating the excitation pulse and the probing picosecond continuum is described. The detection system and the advantages of employing a double-beam picosecond spectrometer with a computerized three dimensional display are presented. A study of the primary events in rhodopsin from 300 to 4 K is presented in some detail.