PHOTODISSOCIATION OF NIOBIUM - CARBON CLUSTERS AND NANOCRYSTALS

被引：65

作者：

PILGRIM, JS ^{[1
]}

BROCK, LR ^{[1
]}

DUNCAN, MA ^{[1
]}

机构：

[1] UNIV GEORGIA,DEPT CHEM,ATHENS,GA 30602

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1995年 / 99卷 / 02期

关键词：

D O I：

10.1021/j100002a016

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：

Metal compound clusters containing niobium and carbon are produced in a laser vaporization pulsed-nozzle cluster source. The mass distributions of cations produced from this source are measured under different conditions. These cations are mass-selected in a specially designed reflectron time-of-flight mass spectrometer and photodissociated at various laser wavelengths. Mass distributions provide evidence for the preferential formation of the M(g)C(12) stoichiometry observed previously and associated with the ''met-cars'' cage structure. Additional abundant masses indicate the formation of face-centered-cubic crystallite stoichiometries. Photodissociation in both the met-cars and crystallite systems results in the formation of a broad distribution of fragment ions, with some enhancement in abundance for the smaller symmetric crystallites. This photochemistry is markedly different from that observed previously for metal-carbon clusters containing titanium, vanadium, molybdenum, or zirconium.

引用

页码：544 / 550

页数：7

共 51 条

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