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Effect of the Impact Angle on the Kinetic Energy and Angular Distributions of beta-Carotene Sputtered by 15 keV Ar-2000 Projectiles

机译:冲击角对β-胡萝卜素溅射的动能和角分布的影响

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摘要

Molecular dynamics (MD) computer simulations are used to model ejection of particles from beta-carotene samples bombarded by 15 keV Ar-2000. The effect of the incidence angle on the angular and kinetic energy distributions is investigated. It has been found that both of these distributions are sensitive to the variation of the incidence angle, particularly near the normal incidence. For impacts along the surface normal, material ejection is azimuthally symmetric, and a significant emission occurs along the surface normal. The kinetic energy distribution of intact molecules has a maximum near 1 eV and terminates below approximately 2 eV. An increase of the incidence angle breaks the azimuthal symmetry. Most of the intact molecules become ejected in the forward direction. The maximum in the polar angle distribution shifts toward large off-normal angles. In addition, the most probable kinetic energy of ejected molecules is significantly increased. The mechanisms of molecular emission responsible for the observed changes are delineated. The implications of the observed ejection characteristics for the utilization of large gas cluster projectiles in secondary neutral mass spectrometry are discussed.
机译:分子动力学(MD)计算机模拟用于将粒子的颗粒喷射到β-胡萝卜素样品中轰击的β-胡萝卜素样品,由15kev ar-2000轰击。研究了入射角对角和动力能分布的影响。已经发现,这两种分布对入射角的变化敏感,特别是在正常发病率附近。对于沿着表面正常的影响,材料喷射是方位称对称的,并且沿着表面正常发生显着的发射。完整分子的动能分布在大约2eV以下最大近1eV并终止于约2eV。发生率的增加破坏方位角对称性。大多数完整分子在向前方向被弹出。极角分布中的最大值朝向大的非正常角度移动。此外,喷射分子的最可能动能显着增加。负责观察到的变化的分子发射机制是划定的。讨论了观察到的喷射特性用于利用次级中性质谱法利用大型气体簇射弹的影响。

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  • 来源
    《Analytical chemistry》 |2019年第14期|共7页
  • 作者单位

    Jagiellonian Univ Smoluchowski Inst Phys S Lojasiewicza 11 Krakow Poland;

    Jagiellonian Univ Smoluchowski Inst Phys S Lojasiewicza 11 Krakow Poland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 分析化学;
  • 关键词

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