%0 Journal Article
%K Deposition
%K Temperature
%K Measurements
%K Measurement
%K USA
%K Surface
%K Ablation
%K Laser
%K Laser ablation
%K Laser ablation
%K Vaporization
%K Oxide
%K Time
%K Beam
%K Ca
%K E
%K Element
%K Fractionation
%K Glass
%K Glasses
%K Icp-ms
%K Inductively coupled plasma (icp)
%K Inductively coupled plasma mass spectrometry
%K Inductively-coupled plasma
%K Mass
%K Mass spectrometer
%K Mass spectrometry
%K Mass spectrometer
%K Mass spectrometry
%K Plasma
%K Plasma mass spectrometry
%K Plasma-mass spectrometry
%K Sample
%K Sampling
%K Spectrometer
%K Spectrometry
%K Lasers
%K Ratio
%K Single
%K Crater
%K Lam-icp-ms
%K Nd:yag
%K Elements
%K Ratios
%K 266 nm
%K Nd:yag laser
%K Nm
%K Correlation
%K Laser ablation sampling
%K Laser beam
%K Melting
%K 213 nm
%K Nist
%K Wavelength
%K Crater geometry
%K Depth
%K Microanalysis
%K Nd
%K Wavelengths
%K Yag
%K Glass samples
%K Elemental fractionation
%K Geochronology
%K Irradiance
%K Laser wavelength
%K Laser-wavelength
%K Pb/u
%K Temperatures
%K Zircon
%A Haichen Liu
%A Oleg V Borisov
%A Xianglei Mao
%A Stephen Shuttleworth
%A Richard E Russo
%B Applied Spectroscopy
%D 2000
%F Laser
%G eng
%N 10
%P 1435-1442
%T Pb/U fractionation during Nd : YAG 213 nm and 266 nm laser ablation sampling with inductively coupled plasma mass spectrometry
%V 54
%2 LBNL-46626
%8 10/2000
%X <p>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 &gt;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.</p>