Structural transition in cyclooctatetraene adsorbed on Ru(001) probed by thermal desorption and two-photon photoemission spectroscopy

被引:7
作者
Tegeder, P [1 ]
Danckwerts, M [1 ]
Hagen, S [1 ]
Hotzel, A [1 ]
Wolf, M [1 ]
机构
[1] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany
关键词
photoelectron spectroscopy; temperature-programmed desorption; redox molecular switch; image potential states; phase transition; organic overlayers on metal surfaces;
D O I
10.1016/j.susc.2005.04.027
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The adsorption of 1,3,5,7-cyclooctatetraene (COT) on Ru(0 0 1) is studied by temperature-programmed desorption (TPD), work function measurements, as well as time- and angle-resolved two-photon photoemission (2PPE) spectroscopy. The TPD data show that COT films grow at 115 K in a metastable phase when the coverage is increased from the chemisorbed monolayer to the bulk-like molecular multilayer structure. The metastable states desorb at a temperature which is; 9 K lower than the desorption temperature of the stable multilayer. At 165 2 K, they undergo an irreversible and thermally activated transformation into the stable multilayer phase. This transition is accompanied by a pronounced increase in the total 2PPE yield by more than one order of magnitude as well as the appearance of image potential states. The image states have binding energies of -0.70 eV and -0.24 eV for the n = 1 and n = 2 states, respectively, and a lifetime of 20 +/- 5 fs for both states. Their appearance is interpreted as an indication of island formation in the stable multilayer regime. 2PPE spectroscopy of the image potential states provides a sensitive probe of structural transitions in the adsorbate layers. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:177 / 190
页数:14
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