CLULU - AN EXPERIMENTAL SETUP FOR LUMINESCENCE MEASUREMENTS ON VAN-DER-WAALS CLUSTERS WITH SYNCHROTRON-RADIATION

We describe a new experimental setup for photoluminescence spectroscop y on van der Waals clusters. It consists of a molecular beam apparatus with a cluster beam installed behind a high intensity vacuum ultravio let synchrotron radiation beamline. Special emphasis was given to the design of a very intense cluster source which can also be used for the preparation of quantum clusters (He,H-2). For the determination of th e cluster size a time-of-flight mass spectrometer can be attached to t he setup. In addition, an atomic cross jet is installed in the experim ental chamber which can be used for mass separation or for doping of t he clusters. The luminescence light can be recorded with several diffe rent detectors or spectrally analyzed with a secondary monochromator w hich is equipped with a position sensitive detector. The pulsed nature of synchrotron radiation provides the basis for time-resolved measure ments in the regime 100 ps-3 mus.