报告题目 (Title)：Imaging the hydronium and hydroxyl pair in ionized liquid water（离子化水中的水合氢离子-氢氧根粒子对成像研究）

报告人 (Speaker)：Shujia Liang（美国斯坦福大学 ）

报告时间 (Time)：2021年9月23日 (周四) 10:00 (UTC+8)

报告地点 (Place)：腾讯在线会议室

https://meeting.tencent.com/dm/TTMjeafj1Xr9

会议 ID：546 345 118

会议密码：126421

邀请人 (Inviter)：李永乐 副教授

摘要 (Abstract)：

The radiolysis of water is ubiquitous in nature and plays a critical role in numerous biochemical and technological applications. While the elementary reaction pathways for the ionization of water have been studied, the short-lived intermediate complex and structural dynamic response after the proton transfer reaction remain poorly understood. Using liquid-phase ultrafast electron diffraction technique to measure the intermolecular O··O and O··H bonds, we capture the short-lived radical-cation complex OH(H3O+) that is formed within 140 femtoseconds through a direct oxygen-oxygen bond contraction and proton transfer, followed by the radical-cation pair dissociation and the subsequent structural relaxation of water within 250 femtoseconds. These measurements provide direct evidence of capturing this metastable radical-cation complex before separation, thereby improving our fundamental understanding of elementary reaction dynamics in ionized liquid water.