A comparison of 266 nm, 213 nm and 193 nm produced from a single solid state Nd:YAG laser for laser ablation ICP-MS
A comparison of 266 nm, 213 nm and 193 nm produced from a single solid state Nd:YAG laser for laser ablation ICP-MS
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DOI：
10.1039/b305434a
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发表时间：
2003-01-01
影响因子：
3.4
通讯作者：
Günther, D
中科院分区：
文献类型：
--
作者：
Guillong, M;Horn, I;Günther, D
比较了266 nm、213 nm和193 nm激光烧蚀作为ICP-MS的采样方法。与以往的研究不同，这是在除波长外基本相同的激光烧蚀条件下进行的。这是通过使用单一固体激光源（1064 nm Nd:YAG）进行谐波产生以及和频混合和光参量振荡来实现的。在NIST 600系列硅酸盐玻璃上进行了实验。在193 nm < 213 nm < 266 nm的波长范围内，测量了三种波长的粒径分布。这种效应与样品在每个波长不透明<透明>的吸收行为有关。随着波长的增加，颗粒尺寸逐渐变大，影响了瞬态信号中的噪声及其强度比。用193nm烧蚀时，产生的直径为> ~ 150nm的粒子数量比用193nm烧蚀时产生的波长长。由于0.15 μ m以上的颗粒数量减少，汽化引起ICP内元素分馏，特别是对更透明的样品减少。213 nm的烧蚀行为和由此产生的ICP-MS响应数据表明，该波长介于193 nm和266 nm之间，但对于不透明的样品偏向193 nm，而对于更透明的样品偏向266 nm。这项研究（保持激光参数恒定且不超过深度与直径的2:1比）表明，波长首先负责颗粒尺寸分布，并且它们的分布导致ICP内的汽化，雾化和电离效应增强。到目前为止，只有193 nm产生的颗粒尺寸（如硅酸盐样品的选择所示）可以使用普通的ICP-MS仪器化学计量转化为离子。
Laser ablation using wavelengths of 266 nm, 213 nm and 193 nm as a sampling method for ICP-MS was compared. Unlike previous studies, this was performed under essentially identical laser ablation conditions with the exception of wavelength. This was achieved by using a single solid state laser source (1064 nm Nd:YAG) for harmonic generation together with sum frequency mixing and optical parametric oscillation. Experiments were carried out on the NIST 600 series silicate glasses. Particle size distributions for all three wavelength were measured and increased in the order 193 nm < 213 nm < 266 nm. This effect is related to the absorption behaviour of the sample opaque < transparent at each wavelength. The change towards larger particle sizes with increasing wavelength is influencing the noise in the transient signals and their intensity ratios. A smaller number of particles with diameters of > 150 nm are produced in comparison to longer wavelengths when ablating with 193 nm. Due to the decreased amount of particles above 0.15 mum vaporisation induced elemental fractionation within the ICP, especially for more transparent samples is reduced. Data on the behaviour of 213 nm ablation and resulting ICP-MS response demonstrated that this wavelength is intermediate between 193 nm and 266 nm, but biased towards 193 nm for more opaque samples and biased towards 266 nm for those more transparent. This study (maintaining laser parameter constant and not exceeding depth to diameter ratios of 2:1) shows that the wavelengths in first instance are responsible for particle size distribution and that their distribution leads to enhanced vaporisation, atomisation and ionisation effects within the ICP. Until now, only 193 nm produced particle sizes (as shown for the selection of silicate samples) can be stoichiometrically converted into ions using common ICP-MS instruments.