Abstract
A spectral-kinetic recorder operating in a special time-gating mode was developed for time-shifted measurement of time-resolved spectra and emission-line intensity kinetics in atomic emission analysis. The luminescence intensity kinetics of Cu, Zn, Sn, and Pb were recorded for two-pulse laser ablation of pure metals and multicomponent alloys. The spectral-line intensity kinetics of pure metals could be approximated with high accuracy by exponential functions. The analytical signal for ablation of multicomponent samples decayed exponentially only for interpulse laser intervals <3 μs.
Highlights
Research in molecular and atomic-emission spectrometry (AES) has historically been focused on recording spectra rather than kinetics and polarization, the other two main optical characteristics of luminescence
The results showed that the kinetics of the examined line intensities with two–pulse laser ablation of pure metals could be described by an exponential function
The spectral-kinetic recorder operating in special time-gating mode could simultaneously measure time-resolved spectra and the kinetics of spectral line intensities during AES analysis
Summary
Research in molecular and atomic-emission spectrometry (AES) has historically been focused on recording spectra rather than kinetics and polarization, the other two main optical characteristics of luminescence This circumstance is due, on one hand, to the broad distribution of very simple purely spectral instruments and, on the other, to the more complicated technology of kinetics and polarization measurements. The slow repetition rate of the exciting signals hinders the use of highly sensitive time-correlated photon-counting systems [7] synchronous photon counting based on spectrographs with several detectors can be used for LAES [7] This allows the intensity kinetics of weak spectral lines to be detected with the required uncertainty due to accumulation of multiple counts
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