Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany.
Angew Chem Int Ed Engl. 2023 Jan 2;62(1):e202212020. doi: 10.1002/anie.202212020. Epub 2022 Nov 30.
Photoelectron Circular Dichroism (PECD) is a forward-backward asymmetry in the photoemission from a non-racemic sample induced by circularly polarized light. PECD spectroscopy has potential analytical advantages for chiral discrimination over other chiroptical methods due to its increased sensitivity to the chiral potential of the molecule. The use of anions for PECD spectroscopy allows for mass-selectivity and provides a path to simple experimental schemes that employ table-top light sources. Evidence of PECD for anions is limited, and insight into the forces that govern PECD electron dynamics in photodetachment is absent. Here, we demonstrate a PECD effect in the photodetachment of mass-selected deprotonated 1-indanol anions. By utilizing velocity map imaging photoelectron spectroscopy with a tunable light source, we determine the energy-resolved PECD over a wide range of photon energies. The observed PECD reaches up to 11 %, similar to what has been measured for neutral species.
光电子圆二色性（PECD）是由圆偏振光诱导的非手性样品中光发射的前后不对称性。PECD 光谱学在手性鉴别方面相对于其他旋光方法具有潜在的分析优势，因为它对分子的手性势具有更高的灵敏度。阴离子在 PECD 光谱学中的应用允许进行质量选择性，并提供了一种简单的实验方案，该方案采用台式光源。阴离子的 PECD 证据有限，并且缺乏控制光电子离解中 PECD 电子动力学的力的洞察力。在这里，我们在质量选择的去质子化 1-吲哚醇阴离子的光电子离解中证明了 PECD 效应。通过利用可调谐光源的速度图成像光电电子能谱，我们在广泛的光子能量范围内确定了能量分辨的 PECD。观察到的 PECD 高达 11%，与已测量的中性物质相似。
