A molecular dynamics study of helium bombardments on tungsten nanoparticles

作者：Li, Min^*; Hou, Qing; Cui, Jiechao; Wang, Jun

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2018, 425: 43-49.

DOI：10.1016/j.nimb.2018.04.016

• Molecular dynamics simulations
• Tungsten nanoparticle
• Helium
• Bombardments

Molecular dynamics simulations were conducted to study the bombardment process of a single helium atom on a tungsten nanoparticle. Helium atoms ranging from 50 eV to 50 keV were injected into tungsten nanoparticles with a diameter in the range of 2-12 nm. The retention and reflection of projectiles and sputtering of nanoparticles were calculated at various times. The results were found to be relative to the nanoparticle size and projectile energy. The projectile energy of 100 eV contributes to the largest retention of helium atoms in tungsten nanoparticles. The most obvious difference in reflection exists in the range of 3-10 keV. Around 66% of sputtering atoms is in forward direction for projectiles with incident energy higher than 10 keV. Moreover, the axial direction of the nanoparticles was demonstrated to influence the bombardment to some degree.

• 出版日期2018-6-15
• 单位四川大学