Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong.
J Chem Phys. 2011 Nov 28;135(20):204308. doi: 10.1063/1.3663619.
Electronic transition spectrum of cobalt monoboride (CoB) in the visible region between 495 and 560 nm has been observed and analyzed using laser-induced fluorescence spectroscopy. CoB molecule was produced by the reaction of laser-ablated cobalt atom and diborane (B(2)H(6)) seeded in argon. Fifteen vibrational bands with resolved rotational structure have been recorded, which included transitions of both Co(10)B and Co(11)B isotopic species. Our analysis showed that the observed transition bands are ΔΩ = 0 transitions with Ω" = 2 and Ω" = 3 lower states. Four transition systems have been assigned, namely, the 18.1Π(2)-X(3)Δ(2), the 18.3Φ(3)-X(3)Δ(3), the [18.6]3- X(3)Δ(3), and the [19.0]2-X(3)Δ(2) systems. The bond length, r(o), of the X(3)Δ(3) state of CoB is determined to be 1.705 Å. The observed rotational lines showed unresolved hyperfine structure arising from the nuclei, which conforms to the Hund's case (a(β)) coupling scheme. This work represents the first experimental investigation of the CoB spectrum.
利用激光诱导荧光光谱技术，在 495nm 至 560nm 的可见光范围内，观察并分析了一硼化钴（CoB）的电子跃迁光谱。CoB 分子是通过激光烧蚀的钴原子与氩气中掺有的二硼烷（B(2)H(6)）反应生成的。共记录了十五条具有分辨出的转动结构的振动带，其中包括 Co(10)B 和 Co(11)B 同位素物种的跃迁。我们的分析表明，观察到的跃迁带是ΔΩ=0 的跃迁，其下态为 Ω"=2 和 Ω"=3。已分配了四个跃迁系统，即 18.1Π(2)-X(3)Δ(2)、18.3Φ(3)-X(3)Δ(3)、[18.6]3- X(3)Δ(3)和[19.0]2-X(3)Δ(2)系统。CoB 的 X(3)Δ(3)态的键长 r(o)确定为 1.705Å。观察到的转动谱线显示出未分辨的由核引起的超精细结构，符合 Hund 的情况（a(β)）耦合方案。这项工作代表了对 CoB 光谱的首次实验研究。
