Laser microbe sampling and laser-enhanced ionization spectrometry in flames for surface analysis

Trace Level Determination of Lead in Solid Samples by UV Laser Ablation and Laser-Enhanced Ionization Detection

“…As was reported by Pang and Yeung, LEI detection cannot be performed directly in the laser plasma plume, because the high local temperature results in a high background current from the thermal ionization of analytes and matrix components alike and also because spectral resolution is severely degraded by pressure-broadening effects. More recently, Gorbatenko et al. , reported on the development of a hybrid technique in which a solid sample was placed directly below the combustion zone of a specially designed air/acetylene flame. Ablation of aluminum alloy samples was performed with the second harmonic of an Nd:YAG laser (532 nm), and lithium was detected by two-step excitation (λ 1 = 670.784 nm and λ 2 = 610.362 nm).…”

Atomic Absorption, Atomic Emission, and Flame Emission Spectrometry

“…This technique was also used (317) to study the two-dimensional distribution of flame gas constituents, when a CCD detector permitted the simultaneous monitoring of several species. Garbatenko et al (318) studied the emission of Li after its introduction into a flame by laser ablation of solid samples. Lakatos et al (319) prepared emulsions for the analysis of organic liquids, to reduce differences in their aerosol desolvation characteristics.…”

Anomalous behaviour of the non-selective ionisation signal pulse under laser ablation into a flame

“…1 The combination of LEIS with laser ablation (LA) of solid samples into a flame allows us to perform local microanalysis of the sample surface. 2 Here, we report the observations of pulsed LEIS signals under LA of a lithium-containing aluminium alloy into a flame. We found that there were two ion current pulses: the first one was associated with strong ablating laser radiation, and the second one was associated with selective exciting laser radiation.…”

“…The experimental set-up was described in detail elsewhere. 3 The geometry of the sample, electrodes, laser beams and flame is presented in Figure 1. The iridium wire electrode (1) was used as a probe.…”