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Two-photon E1M1 transition rates are evaluated for heliumlike ions withnuclear charges in the range Z = 50-94. The two-photon rates modify previouslypublished lifetimes/transition rates of 2 3P0 states. For isotopes with nuclearspin I not equal 0, where hyperfine quenching dominates the 2 3P0 decay,two-photon contributions are significant; for example, in heliumlike 187 Os thetwo-photon correction is 3% of the total rate. For isotopes with I= 0, wherethe 2 3P0 decay is unquenched, the E1M1 corrections are even more importantreaching 60% for Z=94. Therefore, to aid in the interpretation of experimentson hyperfine quenching in heliumlike ions and to provide a more completedatabase for unquenched transitions, a knowledge of E1M1 rates is important.Comment: 6 pages, 3 figures, 3 table

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

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