Fernandez-Lima F A, Pinnick V T, Della-Negra S, Schweikert E A
Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA.
Surf Interface Anal. 2011 Jan;43(1-2):53-57. doi: 10.1002/sia.3592.
First evidence of photon emission from individual impacts of massive gold projectiles on solids for a number of projectile-target combinations is reported. Photon emission from individual impacts of massive Au(n) (+q) (1 ≤ n ≤ 400; q = 1-4) projectiles with impact energies in the range of 28-136 keV occurs in less than 10 ns after the projectile impact. Experimental observations show an increase in the photon yield from individual impacts with the projectile size and velocity. Concurrently with the photon emission, electron emission from the impact area has been observed below the kinetic emission threshold and under unlikely conditions for potential electron emission. We interpret the puzzling electron emission and correlated luminescence observation as evidence of the electronic excitation resulting from the high-energy density deposited by massive cluster projectiles during the impact.
报道了大量金弹丸与多种弹丸-靶组合对固体的单个撞击产生光子发射的首个证据。大量Au(n)(+q)（1≤n≤400；q = 1 - 4）弹丸在28 - 136 keV能量范围内撞击时，单个撞击产生的光子发射在弹丸撞击后不到10纳秒内发生。实验观察表明，单个撞击产生的光子产额随弹丸尺寸和速度增加。在低于动能发射阈值且在不太可能发生潜在电子发射的条件下，观察到撞击区域有电子发射，同时伴随着光子发射。我们将这种令人困惑的电子发射和相关发光观测解释为大量团簇弹丸撞击过程中沉积的高能量密度导致电子激发的证据。
