Collision-induced spin flip of hydrogen atoms

Abstract

The cross section of a radiationless electronic spin-state transition (triplet-singlet transition) of two colliding, unexcited, hydrogen atoms has been calculated for low relative velocities. The low-velocity limit of this cross section exhibits a logarithmic divergence and decreases rapidly to a value of the order of πr0^2 (r0=classical electron-radius e^2/4πmc^2) with increasing energy of relative motion.

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