Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 4: Coulomb-explosion Imaging (joint session MO/A)
A 4.6: Vortrag
Montag, 11. März 2024, 12:30–12:45, HS 3044
Ultrafast photofragmentation studies of CF3I·I− using mass-selected ion-molecule cluster beam apparatus — •Xiaojun Wang1,4, Mahmudul Hasan1, Lin Fan1, Yibo Wang1, Hui Li2, Daniel Slaughter3, and Martin Centurion1 — 1Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA — 2Department of Chemistry, Nebraska Center for Materials and Nanoscience, and Center for Integrated Biomolecular Communication, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA — 3Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, California 94720, USA — 4Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.
We describe an apparatus for investigating the excited-state dissociation dynamics of mass-selected ion-molecule clusters by mass-resolving and detecting photofragment-ions and neutrals, in coincidence, using an ultrafast laser operating at high repetition rates. The apparatus performance is tested by measuring the photofragments: I−, CF3I− and neutrals from photoexcitation of the ion-molecule cluster CF3I·I− using femtosecond UV laser pulses with a wavelength of 266 nm. The experimental results are compared with our ground state and excited state electronic structure calculations as well as the existing results and calculations, with particular attention to the generation mechanism of the anion fragments and dissociation channels of the ion-molecule cluster CF3I·I− in the charge-transfer excited state.
Reference: Rev. Sci. Instrum. 94, 095111 (2023)
Keywords: Photofragmentation; Photodissociation; Time of flight mass spectrometer; Cluster dynamics; Electronic structure methods