ACME 2018 |d_e| < 1.1e-29 e cm using ThO molecular-beam; modern HfF+ JILA 2023 improvement to 4.1e-30; CP-violation strong-limit.
ACME 2018 |d_e| < 1.1e-29 e cm using ThO molecular-beam; modern HfF+ JILA 2023 improvement to 4.1e-30; CP-violation strong-limit.