Ban Loren, West Christopher W, Chasovskikh Egor, Gartmann Thomas E, Yoder Bruce L, Signorell Ruth
ETH Zurich, Department of Chemistry and Applied Biosciences, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland.
J Phys Chem A. 2020 Oct 1;124(39):7959-7965. doi: 10.1021/acs.jpca.0c06935. Epub 2020 Sep 18.
Below band gap formation of solvated electrons in neutral water clusters using pump-probe photoelectron imaging is compared with recent data for liquid water and with above band gap excitation studies in liquid and clusters. Similar relaxation times on the order of 200 fs and 1-2 ps are retrieved for below and above band gap excitation, in both clusters and liquid. The independence of the relaxation times from the generation process indicates that these times are dominated by the solvent response, which is significantly slower than the various solvated electron formation processes. The analysis of the temporal evolution of the vertical electron binding energy and the electron binding energy at half-maximum suggests a dependence of the solvation time on the binding energy.
利用泵浦-探测光电子成像技术，对中性水团簇中溶剂化电子低于带隙形成的情况与液态水的最新数据以及液态和团簇中高于带隙激发的研究进行了比较。在团簇和液体中，低于和高于带隙激发的弛豫时间相似，约为200飞秒和1 - 2皮秒。弛豫时间与产生过程无关，这表明这些时间主要由溶剂响应决定，而溶剂响应明显慢于各种溶剂化电子形成过程。对垂直电子结合能和半高宽处电子结合能的时间演化分析表明，溶剂化时间与结合能有关。
