Sublinear effect in light emission from cesium iodide bombarded by keV polyatomic projectiles
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Our experiments examined light emission from a CsI target bombarded with polyatomic projectiles [H+n, (NaF)nNa+, with n = 1,2; Na+, Cs2I+, Cs+] at 5-30 keV impact energies. The light emission increases with primary ion velocity as (V- Vth), where Vth is a velocity threshold. The number of photons emitted under one cluster impact increases with the number of atoms in the projectile, displaying a sublinear effect, similar to that reported elsewhere for electron emission. The model of sweeping out electrons has been applied to explain and calculate the observed effect. 1998 Elsevier Science B.V.