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The role of defects in laser induced positive ion emission from ionic crystals

机译:缺陷在离子晶体的激光诱导正离子发射中的作用

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The energy distributions of positive ions produced by exposing single-crystal MgO to pulsed 248 nm excimer laser light at fluences of 200-1100 mJ/cm~2 were determined by combined quadrupole mass spectrometry and time-of-flight techniques. The dominant ionic species is Mg~+, although small amounts of Mg~(2+), MgO~+, and Mg_2O~+ are also observed. In particular, the Mg~+ and Mg~(2+) energies distributions each show two peaks, with the energies of the Mg~2+ peaks at significantly higher energies. Ion trajectory simulations (accounting for Coulomb forces only and assuming no surface relaxation) suggest that Mg~(2+) and Mg~+ adsorbed at sites directly atop surface F-centers (oxygen vacancies with two trapped electrons) would be ejected upon photo-of the F-center. The experimentally observed kinetic energies and angular distributions agree well with the energies and angles predicted by these simulations.
机译:通过结合四极质谱和飞行时间技术,测定了单晶MgO在248nm到1100mJ / cm〜2的注量下,将单晶MgO暴露在脉冲248nm准分子激光中所产生的正离子能量分布。尽管也观察到少量的Mg〜(2 +),MgO〜+和Mg_2O〜+,但主要的离子种类是Mg〜+。尤其是,Mg〜+和Mg〜(2+)的能量分布分别显示两个峰值,而Mg〜2 +峰值的能量明显更高。离子轨迹模拟(仅考虑库仑力并且假定没有表面弛豫)表明,吸附在表面F中心正上方的位点(带有两个俘获电子的氧空位)上的Mg〜(2+)和Mg〜+会在光子作用下被喷出。 F中心的实验观察到的动能和角度分布与这些模拟预测的能量和角度非常吻合。

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