摘要
首次报道了CrC~+、MoC~+和WC~+分子离子键离解能。通过测量M~++XY→MX~++Y的反应阈值,其中XY是已知键离解能的双原子分子,可以推出MX~+的键离解能。利用同步辐射真空紫外光电离原理,电离过渡金属议基化合物M(CO)_6(M=Cr、Mo和W),从而产生金属离子M~+和金属离子碳化物MC~+(M=Cr,Mo和W),测量M~+和MC~+的出现势,结合已知的CO分子链离解能D_0(C-O)=11.09eV和图中的关系,可以求得MC~+的键离解能,其值分别为D_0(Cr~+-C)=(2.87±0.25)eV,D_0(Mo~+-C)=(3.39±0.30)eV和D_0(W~+-C)=(3.86±0.35)eV.
The results of our first measurement of the bond energies of CrC^+, MoC^+, and WC^+ werereported. The bond energies are detedrined from the appearance potentials of M^+ andMC^+ (M=Cr, Mo, and W) in the photoionization / fragmentation of M(CO)__6 with a synchrtron radi -ation sourc in the spectral range of 30 ~ 160 nm. Bond dissociation energies derivved by this methodare : D_0(Cr^+ - C) = (2.87±0.25) eV, D_0(Mo^+ - C) = (3.39 ± 0.30) eV, and D_0(W^+ - C) = (3.86±0.35) eV
基金
中国科技大学青年基金
关键词
键离解能
同步辐射
碳化铬
碳化钼
碳化钨
Bond dissociation energy
Synchrotron radiation
Photoionization
Transition metal carbide ions