Elastic scattering of 1-100eV lithium ions in helium.
Eager, Walter J.
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As the initial phase in the determination of the interatomic potential function for the Lithium ion-Helium atom system the "effective attenuation cross section", Q, of a Li+ beam in He gas was measured. The energy of the incident Li+ ion was varied from about 1 to about 1Q0 eV and the fraction of the collimated beam, which avoided scattering in its passage through a helium filled gas cell, was measured. The length of the scattering chamber was 7.76 cm and the gas pressures were in the region of 2 to 20 X 10 Torr. Two slit geometries were used: (0.0635) x (1.27) cm and (0.127) x (1.27) cm; the dimensions of the entrance and exit slit being the same in each case. The values of Q decreased with increasing energy and varied from about 3 x 10" 16 cm2 to about 1 x 10~ 16 cm2 .
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