Determination of spatial distribution of gas concentration in an inhomogeneous gas volume from integral characteristics of attenuation of laser radiation

1999 ◽  
Vol 42 (6) ◽  
pp. 552-556
Author(s):  
M. E. Antipin ◽  
O. K. Voitsekhovskaya ◽  
F. G. Shatrov
Keyword(s):  
Spatial Distribution ◽  
Laser Radiation ◽  
Gas Concentration ◽  
Integral Characteristics ◽  
Gas Volume ◽  
Inhomogeneous Gas

Determination of the spatial distribution of focused laser radiation from the shape of the Stark resonance profile

2004 ◽  
Vol 96 (4) ◽  
pp. 595-598
Author(s):  
I. I. Bondar’ ◽  
V. V. Suran ◽  
D. I. Bondar’
Keyword(s):  
Spatial Distribution ◽  
Laser Radiation

scholarly journals Quantitative Determination of the Surface Distribution of Supported Metal Nanoparticles: A Laser Ablation–ICP–MS Based Approach

Chemosensors ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 77
Author(s):  
Davide Spanu ◽  
Gilberto Binda ◽  
Marcello Marelli ◽  
Laura Rampazzi ◽  
Sandro Recchia ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Laser Ablation ◽  
Quantitative Determination ◽  
Metal Nanoparticles ◽  
Total Mass ◽  
Functional Materials ◽  
Metal Extraction ◽  
Ms Analysis ◽  
Icp Ms

A laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) based method is proposed for the quantitative determination of the spatial distribution of metal nanoparticles (NPs) supported on planar substrates. The surface is sampled using tailored ablation patterns and the data are used to define three-dimensional functions describing the spatial distribution of NPs. The volume integrals of such interpolated surfaces are calibrated to obtain the mass distribution of Ag NPs by correlation with the total mass of metal as determined by metal extraction and ICP–MS analysis. Once this mass calibration is carried out on a sacrificial sample, quantifications can be performed over multiple samples by a simple micro-destructive LA–ICP–MS analysis without requiring the extraction/dissolution of metal NPs. The proposed approach is here tested using a model sample consisting of a low-density polyethylene (LDPE) disk decorated with silver NPs, achieving high spatial resolution over cm2-sized samples and very high sensitivity. The developed method is accordingly a useful analytical tool for applications requiring both the total mass and the spatial distribution of metal NPs to be determined without damaging the sample surface (e.g., composite functional materials and NPs, decorated catalysts or electrodic materials).

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