> when they suddenly "decelerate" (i.e. collide with other charged particles) I think it'd be more accurate to say "interact" instead of "collide" – the electr

> when they suddenly "decelerate" (i.e. collide with other charged particles) I think it'd be more accurate to say "interact" instead of "collide" – the electron could still be far away from the charged particle. More generally, bremsstrahlung also occurs when an electron's velocity vector (not necessarily its modulus) changes, i.e. when the electron changes direction, like in a synchroton. > In fact the name "bremsstrahlung" means "braking radiation," if memory serves. That's correct :)