More Magic Numbers in Titanium-Carbon Anion Clusters: Can This Be Explained by Any Structural Growth Pattern?

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2001,（12）
• 所属期刊栏目: ATOMIC AND MOLECULAR PHYSICS
• 页码范围: 1582-1585
• 页数: 4页
• 分类号: O4
• 语种: 英文

摘要

Titanitum-carbon anion clusters with a mass range up to 1800 amu have been generated in a Smalley-type cluster source involving a target rod composed of titanium and graphite powders, and have been analysed by time-of-flight mass spectrometry. In the lower mass range (up to 1200 amu), our mass spectrum reproduces all the magic numbers, which have been reported previously, i.e. Ti3Cs, Ti6C-13, Ti7C13, Ti9C15, Ti13C22, and Ti14C24, in spite of many differences in experimental conditions. In the higher mass range (1200-1800 amu), we observe new magic numbers at Ti15C26, Ti20C33/Ti20C34 and Ti25C442, which cannot be accounted for by the previously proposed structural growth patterns. All the magic and local maximum TixCy peaks have a metal-to-carbon ratio of approximately 1:1.7. The present results suggest a further complexity to the structural growth patterns of the transition metal-carbon mixed cluster systems.