Photoelectron imaging of size-selected metal cluster anions in a quasi-continuous mode

Takuya Horio, Kento Minamikawa, Tasuku Nishizato, Haruki Hashimoto, Kazuaki Matsumoto, Masashi Arakawa, Akira Terasaki

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Abstract

We present a novel high-repetition-rate photoelectron imaging (PEI) apparatus for exploring electronic structures of metal cluster anions. A continuous beam of mass-selected metal cluster anions, generated by a magnetron-sputtering cluster-ion source coupled with a quadrupole mass filter, is chopped into sub-megahertz ion bunches using a high-voltage pulser. The quasi-continuous anion beam is introduced into a PEI spectrometer, where the anions are photodetached using a 404 nm (3.07 eV) continuous-wave laser diode. As a demonstration, we acquire photoelectron images for size-selected Ag cluster anions, AgN- (N = 3, 7, 14), and show that each image can be obtained in a short accumulation time (50 s) with a kinetic energy resolution (ΔE/E) of 4% at E = 1.77 eV. The quasi-continuous PEI technique enables high-count-rate, space-charge-free acquisition of photoelectron spectra and angular distributions not only from size-selected metal cluster anions but also from anions prepared by other continuous ion sources, such as electrospray ionization.

Original languageEnglish
Article number083302
JournalReview of Scientific Instruments
Volume93
Issue number8
DOIs
Publication statusPublished - Aug 1 2022

All Science Journal Classification (ASJC) codes

  • Instrumentation

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