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物理学科Seminar第562讲:Shujia Liang(2021年9月23日10:00)
发布人:  张晓智  发布时间:  2021-09-22  浏览量:   关闭

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.


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