中文摘要：

利用Cu针与H2（或D2）／Ar的混合气高压直流放电产生结合超声射流分子束技术制备低振转温度的Cull（或CuD）分子，利用光腔衰荡光谱和激光诱导荧光光谱技术相结合研究了CuH和CuD分子的A1∑＋-x1∑＋电子跃迁光谱．A1∑＋-X0∑＋跃迁的激光诱导荧光光谱与光腔衰荡光谱的不同谱线轮廓表明A1∑＋态发生了预解离过程．测量了上态不同转动能级的寿命，得到了J’依赖的预解离速率．基于前人的理论计算，提出预解离机理是由A1∑＋态与最低能量的0∑＋态之间较强的自旋．轨道相互作用所导致的．用相似的实验条件，研究CuD分子，发现A0∑＋态不存在预解离情形．

英文摘要：

A combined cavity ringdown （CRD） and laser induced fluorescence （LIF） spectroscopic study on the A1∑＋-X1∑＋ transition of Cull has been presented. The Cull molecule, as well as its deuterated isotopologue CuD, are produced in a supersonic jet expansion by discharging H2 （or D2） and Ar gas mixtures using two copper needles. Different profiles of relative line intensities are observed between the measured LIF and CRD spectra, providing an experimental evidence for the predissociation behavior in the A1∑＋ state of Cull. The lifetimes of individual upper rotational levels are measured by LIF, in which the J＇-dependent predisso- ciation rates are obtained. Based on the previous theoretical calculations, a predissociation mechanism is concluded due to the strong spin-orbit coupling between the A1∑＋ state and the lowest-lying triplet 3∑＋ state, and a tunneling effect may also be involved in the predis- sociation. Similar experiments are also performed for CuD, showing that the A1∑＋ state of CuD does not undergo a predissociation process.