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From: @S1-A.ARPA,@MIT-MC.ARPA:jrv@mitre-bedford
Newsgroups: net.space
Subject: Re: Matter-Antimatter and particles near the speed of light
Message-ID: <2103@mordor.UUCP>
Date: Thu, 6-Jun-85 07:38:37 EDT
Article-I.D.: mordor.2103
Posted: Thu Jun  6 07:38:37 1985
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From: jrv@Mitre-Bedford

>         Is the path of the photon normal to the path of the particle? (if the
> particle is moving in a circle, I suppose I should say normal to the tangent
> of the photon's path)
>
>                                         Rick.

For nonrelativistic particles, the radiation from an accelerated charged
particle is mostly normal to the path
of the particle.  For relativistic particles, the radiation is forward
(like headlights on a car).  (See Jackson, _Classical Electrodynamics_,
2nd edition, page 663, figure 14.4)
				      - Jim Van Zandt