Despite more than 20 years of research since the discovery of CP violation in the K0 meson system, no further violations of time reversal invariance have been found. Some of the most sensitive investigations have looked for an electric-dipole moment (edm) of the neutron or various atomic or molecular systems. The best published limit on the edm of the electron of ~2 × 10−24 e cm is derived from experiments on thallium, cesium, metastable xenon, and mercury.1 Various unified gauge theories predict that the electron edm may be as large as a few times 10−25 e cm.2

© 1989 Optical Society of America

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