NDLI: Coherent excitation with a train of electron pulses

Content Provider	IEEE Xplore Digital Library
Author	Noordam, L.D. Guertler, A. Robincheaux, F.
Copyright Year	2000
Description	Author affiliation: FOM-AMOLF, Amsterdam, Netherlands (Noordam, L.D.; Guertler, A.)
Abstract	The Coulomb field of an electron passing an atom generates a transverse electric field corresponding to a half cycle of electromagnetic radiation and a longitudinal field corresponding to a single cycle pulse. These fields induce transitions within the atom. The power spectrum of the radiation of a single-cycle pulse is very broad. The field of the passing electron can induce transitions in the atom to all states for which the energy difference to the initial state, /spl Delta/E, is within the generated power spectrum. As a result, collisional excitation lacks selectivity in the population of the excited states. We investigate how, in such a collisional process, the transfer to an excited state can be enhanced. In our search for a scheme to control the excited state population we are inspired by the success of controlled photoexcitation using narrow-band lasers, having many oscillations of the e.m. radiation field. We investigated if enhanced excitation of a selected state is also possible for electron collisions and thus turn the (inefficient) broadband excitation into controlled excitation to a selected final state. To this end we consider the impact of a train of electron pulses with a repetition frequency /spl nu/. As in the optical case, this will induce a series of N broadband bursts of radiation spectrum. As can be seen in the figure the analogy with photons holds and N electron bursts spaced with time /spl tau//sub r/ will also favour transitions with frequency /spl nu/=1//spl tau//sub t/.
File Size	83770
File Format	PDF
ISBN	0780363183
DOI	10.1109/IQEC.2000.907918
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-09-10
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrons Laser excitation Atomic measurements Optical control Frequency Pulse generation Electromagnetic radiation EMP radiation effects Power generation Narrowband
Content Type	Text
Resource Type	Article

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