TY - JOUR KW - Gas KW - Transportation KW - Standards KW - Optimization KW - Profiles KW - Emission KW - Pulse KW - Water KW - Power KW - System KW - Calibration KW - Ablation KW - Laser KW - Laser ablation KW - Laser ablation KW - Spectroscopy KW - Intensities KW - Intensity KW - Time KW - Composition KW - Inductively coupled plasma (icp) KW - Inductively-coupled plasma KW - Liquid KW - Mass KW - Mass spectrometry KW - Matrix KW - Nebulization KW - Plasma KW - Samples KW - Sampling KW - Spectrometry KW - Ablated mass KW - Atomic emission KW - Brass KW - Icp KW - Laser pulses KW - Pulses KW - Ratio KW - Science KW - Alloy KW - Elemental analysis KW - England KW - Icp-aes KW - Emission spectrometry KW - Emission spectrometry KW - Ga KW - Ratios KW - Solution KW - Atomic emission spectrometry KW - Flow KW - Inductively coupled plasma atomic emission spectrometry KW - Rates KW - Picosecond KW - Picosecond laser KW - Density KW - Nanosecond KW - Laser ablation sampling KW - Standard KW - Profile KW - Values KW - Region KW - L KW - Electrothermal vaporization KW - Uv KW - Vertical spatial profile AU - Xianglei Mao AU - Richard E Russo AB -

Vertical spatial emission intensity profiles for ICP-AES were measured to optimize and calibrate laser ablation sampling. Laser ablation sampling and laser ablation plus liquid nebulization sampling were studied. The position of maximum ICP emission intensity above the rf load coil changes with gas flow rate for both cases, with the maximum position shifting to higher regions in the plasma at higher flow rates. The maximum emission intensity occurs at a flow rate of approximately 0.2–0.3 l min -1 and at approximately 5–10 mm above the load coil, which are significantly different to the values normally employed for liquid nebulization. In addition, by measuring the spatial emission profiles for laser ablation and nebulization sampling, solutions can be used as standards to calibrate the composition of the laser ablated mass. Calibrated Zn:Cu ratios were measured using UV nanosecond and picosecond laser pulses. Stoichiometric laser ablation sampling of a brass alloy was achieved only by using UV picosecond laser pulses at high power density.

BT - Journal of Analytical Atomic Spectrometry C2 - LBNL-40165 DO - 10.1039/A606059E IS - 2 LA - eng LB - Laser N1 -

LBNL-40165 NOT IN FILE

N2 -

Vertical spatial emission intensity profiles for ICP-AES were measured to optimize and calibrate laser ablation sampling. Laser ablation sampling and laser ablation plus liquid nebulization sampling were studied. The position of maximum ICP emission intensity above the rf load coil changes with gas flow rate for both cases, with the maximum position shifting to higher regions in the plasma at higher flow rates. The maximum emission intensity occurs at a flow rate of approximately 0.2–0.3 l min -1 and at approximately 5–10 mm above the load coil, which are significantly different to the values normally employed for liquid nebulization. In addition, by measuring the spatial emission profiles for laser ablation and nebulization sampling, solutions can be used as standards to calibrate the composition of the laser ablated mass. Calibrated Zn:Cu ratios were measured using UV nanosecond and picosecond laser pulses. Stoichiometric laser ablation sampling of a brass alloy was achieved only by using UV picosecond laser pulses at high power density.

PY - 1997 SP - 177 EP - 182 ST - J. Anal. At. Spectrom. T2 - Journal of Analytical Atomic Spectrometry TI - Optimization and calibration of laser ablation inductively coupled plasma atomic emission spectrometry by measuring vertical spatial intensity profiles VL - 12 ER -