Application of a simple asynchronous mechanical light chopper to multielectron coincidence spectroscopy

Ito, Kenji; Penent, Francis; Hikosaka, Yasumasa; Shigemasa, Eiji; Suzuki, Isao H.; Eland, John H. D.; Lablanquie, Pascal
December 2009
Review of Scientific Instruments;Dec2009, Vol. 80 Issue 12, p123101
Academic Journal
A simple asynchronous mechanical light chopper, based on modification of a turbo-molecular pump, has been developed to extend the interval between light pulses in single bunch operation at the Photon Factory storage ring. A pulse repetition rate of 80 kHz was achieved using a cylinder rotating at 48000 rpm, with 100 slits of 80 μm width. This allows absolute timing of particles up to 12.48 μs instead of the single-bunch period of 624 ns. We have applied the chopper together with a light pulse monitor to measure multielectron coincidence spectra using a magnetic bottle time-of-flight electron spectrometer. With such a system, the electron energies are determined without any ambiguity, the folding of coincidence spectra disappears and the effect of false coincidences is drastically reduced.


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