			15min:

XUV LASER PHOTOIONIZATION SPECTROSCOPY AT A RESOLUTION OF 0.008~CM^-1.

U. HOLLENSTEIN, G. C. L. PETRAGLIO, H. PALM, R. SEILER AND F. MERKT, Laboratorium für Physikalische Chemie, Eidgenössische Technische Hochschule, ETH-Zentrum, CH-8092 Zürich, Switzerland.

A new broadly tunable (7-17~eV) narrow bandwidth (0.008~cm^-1) VUV laser system is presented. The system has been used to record photoionization spectra of small molecules (N₂, CO) in the vicinity of their ionization threshold. At the high resolution detailed information can be extracted on the spectroscopic and dynamic properties of electronically excited states, in particular Rydberg states.