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An approximate quasiclassical treatment is presented for calculating the cross sections for charge transfer from a neutral alkali-metal atom colliding with a halogen atom (chlorine or Auorine). The electron is treated by the time-dependent perturbation in the two-state approximation. The two states are the ground (or the firstexcited) state of alkali-metal atom and the ground state of the halogen negative ion. Charge-transfer cross sections are calculated as a function of relative velocity (z) of collision between v = 0.01 and 5 a.u. Qualitative features of these cross sections are compared with an earlier work on alkali-metal-oxygen collisions. An asymptotic formula at low velocities of collision (p~0) is obtained, which compares with the earlier formula obtained by Bates. At higher velocities cross sections are found to vary as 1/g ', as in the Born approximation.

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