IR-REMPI of vanadium-carbide nanocrystals: Ideal versus truncated lattices

被引：29

作者：

von Helden, G

van Heijnsbergen, D

Duncan, MA

Meijer, G

机构：

[1] EURATOM, FOM, Inst Plasmaphys Rijnhuizen, NL-3439 MN Nieuwegein, Netherlands

[2] Catholic Univ Nijmegen, Dept Mol & Laser Phys, NL-6525 ED Nijmegen, Netherlands

[3] Univ Georgia, Dept Chem, Athens, GA 30602 USA

来源：

CHEMICAL PHYSICS LETTERS | 2001年 / 333卷 / 05期

关键词：

D O I：

10.1016/S0009-2614(00)01301-4

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：

Neutral vanadium-carbide clusters are produced in the gas phase with laser vaporization in a pulsed nozzle source and excited with a free electron laser in the 400-1000 cm(-1) region. Resonant multiphoton excitation induces thermionic electron emission in the isolated metal carbide nanocrystals. This process only occurs for stable neutral clusters which resist multiphoton dissociation. The species observed are cubic nanocrystals and truncated nanocrystals with carbon vacancies at their corners. Their wavelength spectra exhibit resonances associated with surface phonons. The resonance shows only a weak size dependence, shifting from 530 to 490 cm(-1) in going from V14C12 to V32C32 (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：350 / 357

页数：8

共 31 条

[1] MULTIPHOTON EXCITATION, IONIZATION, AND DISSOCIATION DECAY DYNAMICS OF SMALL CLUSTERS OF NIOBIUM, TANTALUM, AND TUNGSTEN - TIME-RESOLVED THERMIONIC EMISSION [J].