TY - JOUR KW - USA KW - Pulse KW - Ablation KW - Laser KW - Laser ablation KW - Laser ablation KW - Time KW - Ca KW - E KW - Fractionation KW - Glass KW - Glasses KW - Icp-ms KW - Icp-ms KW - Icp-ms KW - Inductively coupled plasma (icp) KW - Inductively coupled plasma mass spectrometry KW - Inductively-coupled plasma KW - Mass KW - Mass spectrometry KW - Mass spectrometry KW - Plasma KW - Plasma mass spectrometry KW - Plasma-mass spectrometry KW - Sample KW - Sampling KW - Spectrometry KW - Example KW - Laser pulses KW - Number KW - Pulses KW - Ratio KW - Science KW - Vapor KW - England KW - Excimer laser KW - Solid sampling KW - Direct solid sampling KW - Ratios KW - 266 nm KW - Nm KW - Laser beam KW - 213 nm KW - Ablation icp-ms KW - Glass standard KW - Laser ablation icp-ms KW - Laser ablation icp-ms KW - Nist KW - Nist glass KW - Wavelength KW - Microanalysis KW - Plasma-mass spectrometry KW - Wavelengths KW - Generation KW - Irradiance KW - Pb/u KW - Uv KW - 157 nm KW - Calcite KW - General KW - Nd:yag KW - Need KW - Trace-element analysis KW - Transparency AU - Richard E Russo AU - Xianglei Mao AU - Oleg V Borisov AU - Haichen Liu AB -

As laser ablation becomes more ubiquitous for direct solid sampling with inductively coupled plasma mass spectrometry (ICP-MS), the need to understand and mitigate fractionation (non-stoichiometric generation of vapor species) becomes critical. The influence of laser-beam wavelength on fractionation is not well established; in general, it is believed that fractionation is reduced as the wavelength becomes shorter. This manuscript presents an investigation of fractionation during ablation of NIST glasses and calcite using three UV wavelengths (157 nm, 213 nm and 266 nm). Fractionation can be observed for all wavelengths, depending in each case on the laser-beam irradiance and the number of laser pulses at each sample-surface location. The transparency of the sample influences the amount of sample ablated (removed) at each wavelength, and the extent of fractionation. Pb/Ca and Pb/U ratios are used as examples to demonstrate the degree of fractionation at the different wavelengths.

AD -

Lawrence Berkeley Lab, Berkeley, CA 94720 USA

BT - Journal of Analytical Atomic Spectrometry C2 - LBNL-47085 DO - 10.1039/B004243I IS - 9 LA - eng LB - Laser N2 -

As laser ablation becomes more ubiquitous for direct solid sampling with inductively coupled plasma mass spectrometry (ICP-MS), the need to understand and mitigate fractionation (non-stoichiometric generation of vapor species) becomes critical. The influence of laser-beam wavelength on fractionation is not well established; in general, it is believed that fractionation is reduced as the wavelength becomes shorter. This manuscript presents an investigation of fractionation during ablation of NIST glasses and calcite using three UV wavelengths (157 nm, 213 nm and 266 nm). Fractionation can be observed for all wavelengths, depending in each case on the laser-beam irradiance and the number of laser pulses at each sample-surface location. The transparency of the sample influences the amount of sample ablated (removed) at each wavelength, and the extent of fractionation. Pb/Ca and Pb/U ratios are used as examples to demonstrate the degree of fractionation at the different wavelengths.

PY - 2000 SP - 1115 EP - 1120 ST - J. Anal. At. Spectrom. T2 - Journal of Analytical Atomic Spectrometry TI - Influence of wavelength on fractionation in laser ablation ICP-MS VL - 15 ER -