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[en] The normalized orthopositronium quenching rate, 1Zeff, has been measured for CH3F, CH3Cl, CH3Br, and CH3I in the gas phase. Silica aerogel was used as the positronium formation medium and the microchambers. The 1Zeff values obtained are 1Zeff(CH3F)=0.46±0.03, 1Zeff(CH3Cl)=0.58±0.05, 1Zeff(CH3Br)=0.70±0.04, and 1Zeff(CH3I)=2.1±0.2. The 1Zeff value for CH3I is significantly larger than expected for pick-off quenching. It is probably caused by spin-conversion quenching through spin-orbit interaction.
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