TY - JOUR KW - Size distribution KW - Aerosol KW - Particle KW - Particles KW - Measurements KW - Measurement KW - USA KW - Pulse KW - Ablation KW - Laser KW - Laser ablation KW - Laser ablation KW - Intensities KW - Intensity KW - Time KW - Ca KW - E KW - Icp-ms KW - Inductively coupled plasma (icp) KW - Inductively-coupled plasma KW - Mass KW - Mass spectrometer KW - Mass spectrometer KW - Plasma KW - Samples KW - Spectrometer KW - Atomic emission spectroscopy KW - Brass KW - Lasers KW - Parameters KW - Pulses KW - Signal KW - Single KW - Vapor KW - Alloy KW - Alloys KW - Femtosecond KW - Nanosecond KW - Sem KW - Separation KW - Duration KW - Electron KW - Pulse duration KW - Dc KW - Size KW - Femtosecond laser KW - Nanosecond laser KW - Microprobe KW - Ms KW - Plasma-mass spectrometry KW - Femtosecond laser ablation KW - Silicon KW - Diameter KW - Nanometer KW - Substrate KW - Substrates KW - Distribution KW - Particle-size KW - Chemistry KW - Aerosol-particles KW - Elemental fractionation KW - Femtosecond ablation KW - Operating parameters KW - Particulates KW - Silicon substrate KW - Stabilities KW - Stability AU - Chunyi Liu AU - Xianglei Mao AU - Samuel S Mao AU - Xianzhong Zeng AU - Ralph Greif AU - Richard E Russo AB -

Femtosecond and nanosecond lasers were compared for ablating brass alloys. All operating parameters from both lasers were equal except for the pulse duration. The ablated aerosol vapor was collected on silicon substrates for particle size measurements or sent into an inductively coupled plasma mass spectrometer. The diameters and size distribution of particulates were measured from scanning electron microscope (SEM) images of the collected ablated aerosol. SEM measurements showed that particles ablated using nanosecond pulses were single spherical entities ranging in diameter from several micrometers to several hundred nanometers. Primary particles ablated using femtosecond ablation were similar to100 am in diameter but formed large agglomerates. ICPMS showed enhanced signal intensity and stability using femtosecond compared to nanosecond laser ablation

AD -

Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

AN - 158 BT - Analytical Chemistry C2 - LBNL-54108 LA - eng LB - Laser M1 - 2 N1 -

LBNL-54108 NOT IN FILE

N2 -

Femtosecond and nanosecond lasers were compared for ablating brass alloys. All operating parameters from both lasers were equal except for the pulse duration. The ablated aerosol vapor was collected on silicon substrates for particle size measurements or sent into an inductively coupled plasma mass spectrometer. The diameters and size distribution of particulates were measured from scanning electron microscope (SEM) images of the collected ablated aerosol. SEM measurements showed that particles ablated using nanosecond pulses were single spherical entities ranging in diameter from several micrometers to several hundred nanometers. Primary particles ablated using femtosecond ablation were similar to100 am in diameter but formed large agglomerates. ICPMS showed enhanced signal intensity and stability using femtosecond compared to nanosecond laser ablation

PY - 2004 SP - 379 EP - 383 T2 - Analytical Chemistry TI - Nanosecond and femtosecond laser ablation of brass: Particulate and ICPMS measurements VL - 76 ER -