Abstract

We report the instrumental design and technical details of an (e, 2e) electron momentum spectroscopy (EMS) apparatus, which employs an ultrashort-pulsed incident electron beam with a repetition rate of 5 kHz and a pulse duration in the order of one picosecond. EMS data for the neutral Ar atom in the ground state measured by using the pulsed electron beam are presented to illustrate the potential abilities of the apparatus for ultrafast molecular dynamics. The results are discussed mainly in terms of signal intensity.

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