Abstract
We demonstrate the use of two TM110 resonant cavities to generate ultrashort electron pulses and subsequently measure electron energy losses in a time-of-flight type of setup. The method utilizes two synchronized microwave cavities separated by a drift space of 1.45 m. The setup has an energy resolution of 12 ± 2 eV FWHM at 30 keV, with an upper limit for the temporal resolution of 2.7 ± 0.4 ps. Both the time and energy resolution are currently limited by the brightness of the tungsten filament electron gun used. Through simulations, it is shown that an energy resolution of 0.95 eV and a temporal resolution of 110 fs can be achieved using an electron gun with a higher brightness. With this, a new method is provided for time-resolved electron spectroscopy without the need for elaborate laser setups or expensive magnetic spectrometers.
Highlights
The generation of ultrashort electron pulses has allowed for the investigation of processes on atomic length scales and femtosecond time scales.1–3 A widely used technique is to generate electron pulses through photoemission from a cathode using a femtosecond laser
We demonstrate the use of two TM110 resonant cavities to generate ultrashort electron pulses and subsequently measure electron energy losses in a time-of-flight type of setup
This provides a useful and versatile new tool for time-resolved spectroscopy
Summary
The generation of ultrashort electron pulses has allowed for the investigation of processes on atomic length scales and femtosecond time scales. A widely used technique is to generate electron pulses through photoemission from a cathode using a femtosecond laser. A widely used technique is to generate electron pulses through photoemission from a cathode using a femtosecond laser. The common approach to resolve electron energies is to use sector magnets or Wien filters. Gliserin et al. demonstrated the use of a drift tube, in which electrons are slowed down almost to a complete stop, causing differences in velocity to translate into large differences in drift time. These drift times can be measured using a micro-channel plate detector connected to a time-to-digital converter. A high resolution can be achieved with a relatively large current throughput
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