Metal particles produced by laser ablation for ICP-MS measurements

被引：64

作者：

Gonzalez, Jhanis J. ^{[1
]}

Liu, Chunyi ^{[1
]}

Wen, Sy-Bor ^{[1
]}

Mao, Xianglei ^{[1
]}

Russo, Richard E. ^{[1
]}

机构：

[1] Lawrence Berkeley Lab, Berkeley, CA 94720 USA

来源：

TALANTA | 2007年 / 73卷 / 03期

关键词：

laser ablation; particles; metal; ICP-MS;

D O I：

10.1016/j.talanta.2007.04.029

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Pulsed laser ablation (266nm) was used to generate metal particles of Zn and Al alloys using femtosecond (150 fs) and nanosecond (4 ns) laser pulses with identical fluences of 50 J cm(-2). Characterization of particles and correlation with inductively coupled plasma mass spectrometer (ICP-MS) performance was investigated. Particles produced by nanosecond laser ablation were mainly primary particles with irregular shape and hard agglomerates (without internal voids). Particles produced by femtosecond laser ablation consisted of spherical primary particles and soft agglomerates formed from numerous small particles. Examination of the craters by white light interferometric microscopy showed that there is a rim of material surrounding the craters formed after nanosecond laser ablation. The determination of the crater volume by white light interferometric microscopy, considering the rim of material surrounding ablation craters, revealed that the volume ratio (fs/ns) of the craters on the selected samples was approximately 9 (Zn), 7 (NIST627 alloy) and 5 (NIST1711 alloy) times more ablated mass with femtosecond pulsed ablation compared to nanosecond pulsed ablation. In addition, an increase of Al concentration from 0 to 5% in Zn base alloys caused a large increase in the diameter of the particles, up to 65% while using nanosecond laser pulses. When the ablated particles were carried in argon into an ICP-MS, the Zn and Al signals intensities were greater by factors of similar to 50 and similar to 12 for Is versus ns ablation. Femtosecond pulsed ablation also reduced temporal fluctuations in the 66 Zn transient signal by a factor of 10 compared to nanosecond laser pulses. Published by Elsevier B.V.

引用

页码：567 / 576

页数：10

共 33 条

[1] High-speed digital photographic study of an inductively coupled plasma during laser ablation: comparison of dried solution aerosols from a microconcentric nebulizer and solid particles from laser ablation [J].