193nm ArF准分子激光系统对LA-ICP-MS分析中不同基体的剥蚀行为和剥蚀速率探究

发布时间：2018-04-20 17:21

  本文选题：LA-ICP-MS + nm　； 参考：《岩矿测试》2017年05期

【摘要】：探究LA-ICP-MS分析中不同基体的剥蚀行为和剥蚀速率,可为激光参数设定、基体匹配选择、数据质量保证等方面提供重要参考。本文研究了193 nm ArF准分子激光系统对人工合成/地质样品玻璃、常见矿物和粉末压片的剥蚀行为,同时探究了激光参数(束斑直径、能量密度和剥蚀频率)对剥蚀速率的影响情况。从剥蚀坑形貌可知,193nm ArF激光对玻璃和绝大多数矿物的剥蚀行为良好,但对石英相对较差,这可能与石英内含有微观包裹体,剥蚀过程中局部受热不均有关。粉末压片的剥蚀行为呈现出不可控,可通过提高粉末压片的压制压力或降低粉末颗粒的粒径来改善剥蚀行为;当剥蚀深度大于1.5倍束斑直径时,剥蚀速率随剥蚀深度的增加而逐渐减小,剥蚀深度最多可达束斑直径的两倍左右(RESOlution M-50型号激光系统,3.0 J/cm2激光能量密度);剥蚀速率随激光能量密度的增加而增大,但基本不受剥蚀频率(2~20 Hz)影响。不同基体具有特征的剥蚀速率,本文报道了43种基体的剥蚀速率参数,总体而言,NIST系列玻璃的剥蚀速率大于地质样品玻璃,碳酸盐矿物和硫化物矿物大于硅酸岩矿物,粉末压片大于玻璃和常见矿物。
[Abstract]:The study of denudation behavior and denudation rate of different matrix in LA-ICP-MS analysis can provide important reference for laser parameter setting, matrix matching selection, data quality assurance and so on. The denudation behavior of synthetic / geological sample glass, common mineral and powder pressed by 193nm ArF excimer laser system has been studied in this paper. The laser parameters (beam spot diameter) have also been investigated. The influence of energy density and denudation frequency on denudation rate. The denudation pit morphology shows that the denudation behavior of 193nm ArF laser is good for glass and most minerals, but relatively poor for quartz, which may be related to the existence of microinclusions in quartz and the uneven local heat during denudation. The denudation behavior of the powder sheet is uncontrollable, and the denudation behavior can be improved by increasing the pressing pressure or reducing the particle size, when the denudation depth is greater than 1.5 times the diameter of the beam spot, The denudation rate decreases gradually with the increase of denudation depth, and the denudation depth is up to about twice the diameter of beam spot, and the denudation rate increases with the increase of laser energy density, and the denudation rate increases with the increase of laser energy density, and the denudation rate increases with the increase of laser energy density, and the denudation rate increases with the increase of laser energy density. But it is not affected by the denudation frequency of 20 Hz. In this paper, the denudation rate parameters of 43 kinds of matrix are reported. Generally speaking, the denudation rate of NIST series glass is higher than that of geological sample glass, and carbonate and sulfide minerals are larger than silicate minerals. Powder sheets are larger than glass and common minerals.
【作者单位】： Geowissenschaftliches
【基金】：中国地质科学院基本科研业务费项目(YYWF201622) 国家公派留学基金(201306410007)
【分类号】：O657.63;TN24
，

本文编号：1778697