  We present a method for measuring atomic parity violation in the absence of
static external electric and magnetic fields. Such measurements can be achieved
by observing the interference of parity conserving and parity violating
two-photon transition amplitudes between energy eigenstates of zero electronic
angular momentum. General expressions for induced two-photon transition
amplitudes are derived. The signal-to-noise ratio of a two-photon scheme using
the 6s^2 1S0 to 6s6p 3P0 transition in ytterbium is estimated.
