He i ultraviolet photoelectron spectroscopy of benzene and pyridine in supersonic molecular beams using photoelectron imaging

Suet Yi Liu, Koutayba Alnama, Jun Matsumoto, Kiyoshi Nishizawa, Hiroshi Kohguchi, Yuan-Pern Lee, Toshinori Suzuki*

*Corresponding author for this work

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

We performed He I ultraviolet photoelectron spectroscopy (UPS) of jet-cooled aromatic molecules using a newly developed photoelectron imaging (PEI) spectrometer. The PEI spectrometer can measure photoelectron spectra and photoelectron angular distributions at a considerably higher efficiency than a conventional spectrometer that uses a hemispherical energy analyzer. One technical problem with PEI is its relatively high susceptibility to background electrons generated by scattered He I radiation. To reduce this problem, we designed a new electrostatic lens that intercepts background photoelectrons emitted from the repeller plate toward the imaging detector. An energy resolution (ΔE/E) of 0.735% at E = 5.461 eV is demonstrated with He I radiation. The energy resolution is limited by the size of the ionization region. Trajectory calculations indicate that the system is capable of achieving an energy resolution of 0.04% with a laser if the imaging resolution is not limited. Experimental results are presented for jet-cooled benzene and pyridine, and they are compared with results in the literature.

Original languageEnglish
Pages (from-to)2953-2965
Number of pages13
JournalJournal of Physical Chemistry A
Volume115
Issue number14
DOIs
StatePublished - 14 Apr 2011

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