A versatile, temperature controlled apparatus is presented, which generates deeply cooled liquid microjets of condensed gases, expelling them via a small aperture into vacuum for use in photoelectron spectroscopy (PES). The functionality of the design is demonstrated by temperature- and concentration-dependent PES measurements of liquid ammonia and solutions of KI and NH4I in liquid ammonia. The experimental setup is not limited to the usage of liquid ammonia solutions solely.

Department of Chemistry University of Southern California Los Angeles California 90089 0482 USA

Fritz Haber Institut der Max Planck Gesellschaft Molekülphysik Faradayweg 4 6 14195 Berlin Germany

Helmholtz Zentrum Berlin für Materialien und Energie Albert Einstein Straße 15 12489 Berlin Germany and Department of Chemistry Humboldt Universität zu Berlin Brook Taylor Straße 2 12489 Berlin Germany

Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo nam 2 16610 Prague 6 Czech Republic

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