Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 54: Adsorption an Oberfl
ächen VI

O 54.3: Vortrag

Mittwoch, 9. März 2005, 11:15–11:30, TU EB202

NO laserdesorption of excited C₆₀ — •Tim Hoger¹, Carsten Marzok², and Helmut Zacharias¹ — ¹Uni Münster Wilhelm-Klemm Str. 10 48149 Münster — ²Uni Tübingen

Motivated by long living excited states (exiton states) of a fullerene surface we investigated the desorption of NO rotationally and vibrationally resolved. In a pump / probe experiment we excited the NO covered C₆₀ surface with 355 nm ns pulses and detected desorbed NO by (1+1)REMPI. The spectra yield two desorption channels with different characteristics: a ’fast’ desorption channel produces a typical non thermal laser desorption spectrum with highly excited rotational and vibrational states (T_rot∼ 430 K, T_vib∼ 610 K, E_kin(J)∼ 1500 m/s) and a second ’slow’ desorption channel with low rotational temperatures (T_rot∼ 110 K) as well as an extremily delayed arrival time.