Large Angle Scattering and Energy Loss of Potassium Ions Scattered by Heavy Monatomic Gases

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Abstract
A beam of potassium ions with energies in the range between 90 and 360 volts was scattered by collision with the heavy monatomic gases argon, krypton, xenon, and mercury vapor and the angular distribution was observed. For slower particles the scattering per unit solid angle relative to the center of mass of the colliding particles decreases with angle. At higher voltages the scattering increases at larger angles with a minimum about 60. The scattering at the larger angles increases with voltage. The results are not compatible with a rigid sphere model of the atom. The large deviations may be associated with exciting or ionizing collisions.

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