Study of multiple femtosecond-pulse laser ablation used in analytical methods

分析方法中使用的多飞秒脉冲激光烧蚀研究

• 批准号: 5361610
• 负责人: Dr. Roland Hergenröder
• 金额: --
• 依托单位: Arbeitsgruppe Bioresponsive Materials
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5361610?language=en
• 关键词: Study; multiple; femtosecond; pulse; laser

The ultimative goal of the work is the development of a more versatile and controllable laser sampling system for the introduction of solid materials to analytical instrumentation. The current systems do not have the necessary degree of control over the final state of the material removed from the sample, such as particle size and degree of atomisation. The delivery of multiple femto-second laser pulses to the sample surface may offer the required degree of thermodynamic control. The time-scale of femto-second laser pulses is short compared to thermodynamic equilibration processes in solid material. Delivery of multiple pulses to the sample offers the possibility of controlling the state of the exposed material to a previously impossible degree. Ultra-fast resistance measurements of laser-heated wireds will enable tracking the thermodynamic state of the material, exposing the effects of the laser pulses. Additionally, emission, laser-induced fluorescence, time-of-flight mass spectroscopy and particle size distributions will be monitored to discern the changes of sampling efficiency with pulse sequence.

这项工作的最终目标是开发一种更通用和可控的激光取样系统，用于将固体材料引入分析仪器。目前的系统不具有对从样品中去除的材料的最终状态（诸如颗粒尺寸和雾化程度）的必要程度的控制。将多个飞秒激光脉冲传递到样品表面可以提供所需程度的热力学控制。与固体材料中的热力学平衡过程相比，飞秒激光脉冲的时间尺度很短。向样品输送多个脉冲提供了将暴露材料的状态控制到以前不可能的程度的可能性。激光加热导线的超快电阻测量将能够跟踪材料的热力学状态，暴露激光脉冲的影响。此外，还将监测发射、激光诱导荧光、飞行时间质谱和粒度分布，以辨别采样效率随脉冲序列的变化。