Time-resolved studies of particle effects in laser ablation inductively coupled plasma-mass spectrometry

TitleTime-resolved studies of particle effects in laser ablation inductively coupled plasma-mass spectrometry
Publication TypeJournal Article
Year of Publication2008
AuthorsPerdian DC, Bajic SJ, Baldwin DP, Houk RS
Journal TitleJournal of Analytical Atomic Spectrometry
Volume23
Pages325-335
Date PublishedMar
Type of ArticleArticle
ISBN Number0267-9477
Accession NumberISI:000254354400004
Keywords266 NM, BRASS, DRIED SOLUTION AEROSOLS, ELEMENTAL, femtosecond, FRACTIONATION, ISOTOPIC FRACTIONATION, LA-ICP-MS, NANOSECOND, ND-YAG LASER, SIZE DISTRIBUTION
Abstract

Transient signal responses for ablated samples as a function of particle size and laser parameters are characterized. Data are acquired with time resolution of 5 or 6 ms per data point. Large positive spikes in signal are observed and increase in both amplitude and frequency with increasing particle size. Particle sizes are selected using a differential mobility analyzer. Spikes in the signal also increase with decreasing laser rastering rates. A comparison of lasers with pulse widths of 370 fs and 5 ns shows that shortening the pulse width significantly reduces the frequency and amplitude of positive spikes in signal. These large positive spikes are attributed to the vaporization, atomization, and ionization of individual large intact particles, which are considered to be a major cause of fractionation in laser ablation ICP-MS.

DOI10.1039/b710074d
Alternate JournalJ. Anal. At. Spectrom.