论文标题
腺体负离子的Quasibound状态的光检查光谱
Photodetachment Spectroscopy of Quasibound States of the Negative Ion of Lanthanum
论文作者
论文摘要
Lanthanum的负离子La $^ - $是原子负离子观察到的最丰富的状态光谱之一，并已被提议作为激光冷却应用的有前途的候选人。在目前的实验中，使用可调红外光检查光谱研究了LA $^ - $。在光子能量范围上的590-920 MeV（2100-1350 nm）上，用一个交叉的离子束 - 激光束（2100-1350 nm）测量中性原子产生的相对信号，以探测LA中性原子基态上方的连续脉区。在LA $^ - $光检查横截面中观察到了11个突出峰，这是由于Quasibound瞬时负离子状态的共振激发随后自动驱动。此外，观察到从La $^ - $的几个结合状态到LA的地面和激发态的光检查的阈值。目前的结果提供了有关LA $^ - $的激发态结构和动力学的信息，这些信息取决于多电源相关效应。
The negative ion of lanthanum, La$^-$, has one of the richest bound state spectra observed for an atomic negative ion and has been proposed as a promising candidate for laser-cooling applications. In the present experiments, La$^-$ was investigated using tunable infrared photodetachment spectroscopy. The relative signal for neutral atom production was measured with a crossed ion-beam--laser-beam apparatus over the photon energy range 590 - 920 meV (2100 - 1350 nm) to probe the continuum region above the La neutral atom ground state. Eleven prominent peaks were observed in the La$^-$ photodetachment cross section due to resonant excitation of quasibound transient negative ion states in the continuum which subsequently autodetach. In addition, thresholds were observed for photodetachment from several bound states of La$^-$ to both ground and excited states of La. The present results provide information on the excited state structure and dynamics of La$^-$ that depend crucially on multielectron correlation effects.
