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Ionization dynamics of laser ablation and a laser-ablation-assisted-plasma-discharge ion source.

机译：激光烧蚀和激光烧蚀辅助等离子体放电离子源的电离动力学。

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摘要

new type of ion source has been developed which combines KrF excimer laser ablation and a pulsed power discharge. The ionization dynamics produced in the laser ablation of aluminum and iron, along with the laser-ablation-assisted-plasma-discharge (LAAPD) ion source have been characterized by numerous plasma diagnostics including a newly developed resonant ultraviolet interferometry (RUVI) diagnostic. Focusing a KrF excimer laser (248 nm, 1 J, 4-10 J/cm;Both time-integrated and time-resolved optical emission spectroscopy show the laser ablation plume spectra dominated by neutral atom transitions with ion emission only occurring at early times (;Absorption photography shows decreased neutral atom absorption and enhanced ion absorption over that from only laser ablation when the discharge is applied. Resonant photographs also show the iron plume is very forward directed, while the aluminum plume expands more strongly in the radial direction.;Iron neutral atom line-densities are measured with the RUVI diagnostic by tuning the dye laser near the 271.903 nm ground-state and 273.358 nm excited-state transitions, while iron singly-ionized line-densities are measured using the 273.955 and 263.105 nm excited-state transitions. The line-density, expansion velocity, temperature, and number of each species has been characterized as a function of time for laser ablation and the LAAPD. Data analysis, assuming a Boltzmann distribution, yields the ionization ratio
机译：已经开发出一种新型的离子源，它结合了KrF准分子激光烧蚀和脉冲功率放电。铝和铁的激光烧蚀中产生的电离动力学以及激光烧蚀辅助的等离子体放电（LAAPD）离子源的特征已被许多等离子体诊断所表征，包括新开发的共振紫外线干涉仪（RUVI）诊断。聚焦KrF准分子激光（248 nm，1 J，4-10 J / cm;时间积分和时间分辨光发射光谱都显示以中性原子跃迁为主的激光消融羽流光谱，离子发射仅在早期发生（ ；吸收照片显示，施加放电后，与仅使用激光烧蚀相比，中性原子吸收降低，离子吸收增强；共振照片还显示，铁羽呈非常向前的方向，而铝羽沿径向更强烈地膨胀。使用RUVI诊断仪通过在271.903 nm基态跃迁和273.358 nm激发态跃迁附近调谐染料激光来测量中性原子线密度，而使用273.955和263.105 nm激发态测量铁单离子化的线密度。线密度，膨胀速度，温度和每种物质的数量已表征为激光烧蚀和LAAPD时间的函数。 sis，假设玻尔兹曼分布，得出电离率

著录项

  • 作者

    Lash, Joel Staton.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Physics Fluid and Plasma.;Physics Atomic.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 150 p.
  • 总页数 150
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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