New limit on the electron electric dipole moment.

We present the result of our most recent search for T violation in 205 Tl, which is interpreted in terms of an electric dipole moment of the electron d e . We find d e ͑6.9 6 7.4͒ 3 10 228 e cm, which yields an upper limit jd e j # 1.6 3 10 227 e cm with 90% confidence. The present apparatus is a major upgrade of the atomic beam magnetic-resonance device used to set the previous limit on d e . DOI: 10.1103/PhysRevLett.88.071805 PACS numbers: 13.40.Em, 11.30.Er, 14.60.Cd, 32.10.Dk An intrinsic electric dipole moment (EDM) can exist only if parity (P) and time reversal (T) invariance are violated Like its predecesso