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The cross section for the thermal collision-induced radiative de-activation process He(1 1 S) + He(2 1 S) -> He(1 1 S) + He(1 1 S) + hv is calculated to be 2 × 10 -20 cm 2 , in harmony with the value derived experimentally by Phelps.
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Allison et al. (1966) studied this question.
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