Fast filter-sampling and analysis of PAH aerosols by laser multiphoton ionization

Litani-Barzilai, Iris; Fisher, Michal; Gridin, Vladimir V.; Schechter, Israël

doi:10.1016/s0003-2670(01)01026-1

Cited by 9 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A rather new and uncommon analytical technology is Multiphoton Electron Extraction Spectroscopy (MEES), which has been based of previous analytical applications of multiphoton ionization under ambient conditions: starting with gas phase applications [5][6][7][8], liquids [9], aerosols [10][11][12], and solid surfaces [13][14][15][16][17][18][19][20][21]. MEES is a quantitative analytical spectroscopy, based on detection of photoelectrons extracted in multiphoton process, as a function of laser irradiation wavelength.…”

Section: Introductionmentioning

confidence: 99%

Authentication and Testing of Banknotes Using Laser Multiphoton Electron Extraction Spectroscopy (MEES)

2021

Self Cite

View full text Add to dashboard Cite

In laser multiphoton electron extraction spectroscopy (MEES), the photo-charges extracted from a surface by a pulsed laser beam are recorded as a function of laser wavelength. We report the first application of this spectroscopy to banknotes. Various banknotes from different countries, authentic and counterfeit, have been tested. The results indicate that MEES spectra are both informative (many peaks) and reproducible. The spectra allow for clear distinction between authentic and counterfeit banknotes. Actually, MEES provides a unique fingerprint of the banknotes, so that distinction between various forgery methods (printer used) is also possible.

show abstract

Section: Introductionmentioning

confidence: 99%

Authentication and Testing of Banknotes Using Laser Multiphoton Electron Extraction Spectroscopy (MEES)

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Many methods for analysis of PAH aerosols have been established 3‐7 . Some of them can provide on‐line data, but most of the methods, including the officially certified ones, are based on in‐situ sampling and transportation to a laboratory.…”

Section: Introductionmentioning

confidence: 99%

“…2 Many methods for analysis of PAH aerosols have been established. [3][4][5][6][7] Some of them can provide on-line data, but most of the methods, including the officially certified ones, are based on in-situ sampling and transportation to a laboratory. A severe problem arises from the fact that PAHs composing the aerosols or adsorbed on their surfaces, undergo partial vaporization/sublimation and aging effects (e.g., photochemical reactions).…”

Section: Introductionmentioning

confidence: 99%

Aging effects in analysis of polycyclic aromatic hydrocarbon aerosols

Bulatov

Gridin

Fisher

et al. 2007

Israel Journal of Chemistry

Self Cite

View full text Add to dashboard Cite

Polycyclic aromatic hydrocarbon (PAH) aerosols undergo time‐dependent processes such as various aging effects and material loss due to sublimation. Therefore, when their analysis is delayed, the results may not properly represent the true environmental composition as sampled. Moreover, even when fast analysis is performed, one may still be interested in the initial concentration of these aerosols, at the moment of their formation. In both cases, a characterization of the time dependence of aerosol mass losses and other possible modifications is of interest. In this study we monitored these time‐dependent processes for three different PAH aerosol particulates (anthracene, perylene, and pyrene). We applied two experimental techniques: Fourier transform spectral imaging microscopy (FT‐SIM) and traditional HPLC analysis. The former provided a full fluorescence spectrum at each pixel of the particulate, as well as PAH identification and quantification. The chemical imaging information was also used for morphological characterization of the PAH aerosols, which was applied for developing of a simple mathematical model. The effect of the time‐delay upon the actual aerosol mass can thus be estimated. The original (as‐formed or as‐sampled) aerosol mass can be calculated using the proposed empirical model.

show abstract

“…MPI has also been tested under ambient conditions. − It has been found that the resulting photocurrent can be used for quantitative estimation of the concentration of an easily ionized compound in a hardly ionizable matrix. − In its resonant mode, the method can be used for detection of gaseous organic compounds. , …”

mentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] It has been found that the resulting photocurrent can be used for quantitative estimation of the concentration of an easily ionized compound in a hardly ionizable matrix. [1][2][3][4][5][6][7][8][9][10][11][12][13] In its resonant mode, the method can be used for detection of gaseous organic compounds. 14,15 We succeeded, for the first time, to utilize MPI spectroscopy for direct chemical analysis of solids under ambient conditions.…”

mentioning

confidence: 99%

Multiphoton Ionization Spectroscopy as a Diagnostic Technique of Surfaces Under Ambient Conditions

et al. 2010

Self Cite

View full text Add to dashboard Cite

Direct detection of solid substances is an important yet challenging issue in analytical chemistry. Laser multiphoton ionization spectroscopy has been applied for the first time for direct analysis of solids under ambient conditions. In this method, a solid powder/film is placed on a conductive surface and is irradiated by a pulsed tunable laser while an electrical field of approximately 2 kV cm(-1) is applied across this conductive surface and another electrode. The resulting photoelectrons and negative ions are measured by recording the current as a function of wavelength to produce a multiphoton ionization spectrum that is characteristic of the surface. Results indicate rich spectral features that can be used for compound identification. The present sensitivity is in the low picomole range. This method has been successfully tested for direct detection of various organic molecules, including explosives, narcotic drugs, and polycyclic aromatic compounds.

show abstract

Fast filter-sampling and analysis of PAH aerosols by laser multiphoton ionization

Cited by 9 publications

References 26 publications

Authentication and Testing of Banknotes Using Laser Multiphoton Electron Extraction Spectroscopy (MEES)

Authentication and Testing of Banknotes Using Laser Multiphoton Electron Extraction Spectroscopy (MEES)

Aging effects in analysis of polycyclic aromatic hydrocarbon aerosols

Multiphoton Ionization Spectroscopy as a Diagnostic Technique of Surfaces Under Ambient Conditions

Contact Info

Product

Resources

About