» Sat May 28, 2011 8:02 pm
Well the first problem I see is that, since you'll be using high-energy photons to measure position, they'll have a high momentum (Momentum = Planck constant/wavelength, HE photons = short wavelength, thus high momentum). The photons will thusly knock the electron off its course.
You'll know the position, but getting the actual momentum of the electron gets even more problematic. IIRC, the Doppler effect (blue-/redshift) requires the source to be emitting waves. An electron doesn't do that, nor do any particles. The only exception are charged ones, but they only do that while accelerated (and when it's not interpreted as a standing wave). Even then, the EM radiation is emitted in any direction except in the direction of the movement of the particle, all due to Maxwell's laws of electromagnetism.
The EM waves themselves consists of photons, which gain an uncertain amount of momentum when emitted from the particle, thusly decreasing the momentum of the particle an uncertain amount.
In short, you'll only be getting the position. You still haven't circumvented Heisenberg's uncertainty principle.
I'm just a physics student, though. Not a professor, nor a major (yet).