Ion-Neutral Photofragment Coincidence Imaging of Photodissociation Dynamics of Ionic Species

• 来源期刊: 化学物理学报（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: ARTICLE
• 页码范围: 81-86
• 页数: 6页
• 语种: 英文
• DOI: 10.1063/1674-0068/cjcp2007119

摘要

The recently constructed cryogenic cylindrical ion trap velocity map imaging spectrometer(CIT-VMI)has been upgraded for coincidence imaging of both ionic and neutral photofrag-ments from photodissociation of ionic species.The prepared ions are cooled down in a home-made cryogenic cylindrical ion trap and then extracted for photodissociation experiments.With the newly designed electric fields for ex-traction and acceleration,the ion beam can be accelerated to more than 4500 eV,which is necessary for velocity imaging of the neutral photofragments by using the position-sensitive imaging detector.The setup has been tested by the 355 nm photodissociation dynamics of the argon dimer cation(Ar2+).From the recorded experimental images of both neutral Ar and ionic Ar+fragments,we interpret velocity resolutions of △v/v≈4.6％for neutral fragments,and △v/v≈1.5％for ionic fragments,respectively.