The energy-pooling collision cross section for the transfer from 3s3p^(1)P to 3s4s^(3)S of Mg has been determined by measuring the relative intensity of the fluorescence at 5184Åand 2852Å.The average cross section is(3.1±40%)×10^(-15)cm^(2).By considering the influence of radiation trapping and other uncertain effects,the absolute uncertainty of our measurement is within one order of magnitude.
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