C58 on HOPG:: Soft-landing adsorption and thermal desorption

被引：48

作者：

Böttcher, A ^{[1
]}

Weis, P ^{[1
]}

Bihlmeier, A ^{[1
]}

Kappes, MM ^{[1
]}

机构：

[1] Univ Karlsruhe, Inst Phys Chem, D-76131 Karlsruhe, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2004年 / 6卷 / 22期

关键词：

D O I：

10.1039/b413464h

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：

Electron-impact induced dissociation/ionization of C-60 molecules was used to produce an intense beam of C-58(+) ions. This was directed towards a HOPG (highly oriented pyrolytic graphite) substrate under nominally perpendicular impact conditions in order to generate deposits by soft-landing (kinetic energy <0.1 eV atom(-1)). Deposited C-58 molecules could subsequently be thermally desorbed intactly. Thermal desorption mass spectra of the deposits exhibit only C-58. Surface deposited C-58 can react with background gases to generate hydride derivatives C58Hn which are also desorbable. The apparent desorption energy of C-58 and C58Hn molecules from the HOPG surface varies with increasing adsorbate coverage from 2 +/- 0.1 to 2.2 +/- 0.1 eV as determined by a Redhead analysis. These values are 0.7 +/- 0.1 eV larger than found for C-60 desorbed from the same substrate.

引用

页码：5213 / 5217

页数：5

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