Regensburg 2007 – scientific programme
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O: Fachverband Oberflächenphysik
O 17: Poster Session I (Nanostructures at Surfaces; Metal Substrates: Epitaxy and Growth; Methods: Scanning Probe Techniques; Phase Transitions)
O 17.75: Poster
Monday, March 26, 2007, 17:30–20:30, Poster C
UV laser induced desorption of NO from C60/Cu(111) — •Tim Hoger, Daniel Grimmer, and Helmut Zacharias — Universität Münster, Physikalisches Institut, Wilhelm-Klemm-Str. 10, 48149 Münster
The laser induced desorption of NO from an epitaxially grown C60/Cu(111) surface is reported. The pump-probe experiment detects desorbing NO molecules with respect to their rovibrational population and their kinetic energy. Two channels are observed of which the first channel yields highly excited molecules with a rotational temperature of Trot=800 K, a kinetic temperature of Tkin/(2k)=1000 K and a comparatively low vibrational excitation below Tvib=600 K. A strong translational-rotational coupling is observed. The second channel yields less excited molecules with a rotational temperature of Trot=260 K and an arrival time spectrum of slow molecules far below the thermal desorption temperature. This desorption is probably caused by a long-lived electronic excitation in the substrate for which a lifetime of τ = 155 µs is derived.