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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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
Issue number8
Publication statusPublished - Aug 1 2022

All Science Journal Classification (ASJC) codes

  • Instrumentation


Dive into the research topics of 'Photoelectron imaging of size-selected metal cluster anions in a quasi-continuous mode'. Together they form a unique fingerprint.

Cite this