@article {Liu:2000:0003-7028:1435,
	author = "Liu, Haichen and Borisov, Oleg V. and Mao, Xianglei and Shuttleworth, Stephen and Russo, Richard E.",
	title = "Pb/U Fractionation during Nd:YAG 213 nm and 266 nm Laser Ablation Sampling with Inductively Coupled Plasma Mass Spectrometry",
	journal = "Applied Spectroscopy",
	volume = "54",
	number = "10",
	year = "2000",
	abstract = "Elemental fractionation during laser ablation sampling was investigated by measuring Pb/U ratios in NIST 610 synthetic glass. Two Nd:YAG lasers with wavelengths of 213 and 266 nm were used to ablate the sample into an inductively coupled plasma mass spectrometer. Pb/U fractionation was observed to be similar for both laser wavelengths, and dependent on the irradiance. For representative Pb/U measurements, the necessary laser irradiance should be &#62;0.6 GW/cm<SUP>2</SUP>. However, if the laser beam is initially focused close to the sample surface, fractionation increases and is influenced by the formation of a crater during repetitive pulsing at a single sample location. As the ratio of crater depth to radius increases, plasma sampling and/or an effective irradiance decrease could cause additional fractionation. A good correlation was found between the fractionation of 14 elements in NIST 610 glass and the logarithms of their oxide melting temperatures.",
	pages = "1435-1442",
	url = "http://www.ingentaconnect.com/content/sas/sas/2000/00000054/00000010/art00004",
	doi = "doi:10.1366/0003702001948565",
	keyword = "LASER ABLATION, FRACTIONATION, ICP-MS, Pb/U, CRATER, GEOMETRY"
}