Application of a simple asynchronous mechanical light chopper to multielectron coincidence spectroscopy.
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 microm width. This allows absolute timing of particles up to 12.48 micros 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.
Ito
Kenji
K
Photon Factory, IMSS, KEK, Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan.
Penent
Francis
F
Hikosaka
Yasumasa
Y
Shigemasa
Eiji
E
Suzuki
Isao H
IH
Eland
John H D
JH
Lablanquie
Pascal
P