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

Chen, Yuheng; Bulatov, Valery; Vinerot, Natalia; Schechter, Israël

doi:10.1021/ac100539x

Cited by 12 publications

(9 citation statements)

References 16 publications

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“…The differences in the peaks indicate differences in the chemical composition at the tested sites. Based on previous investigations of MEES, this method is very sensitive to the molecular composition at the irradiate spot [21,22]. Therefore, although the chemical composition of banknotes is not in the public domain, the differences can be attributed to the local chemistry.…”

Section: Resultsmentioning

confidence: 99%

“…Based on previous investigations of MEES, this method is very sensitive to the molecular composition at the irradiate spot. [21,22] Therefore, although the chemical composition of banknotes is not in the public domain, the differences can be attributed to the local chemistry. Note that these differences are observed neither by the naked eye nor by reflectance spectroscopy in the visible range.…”

Section: Resultsmentioning

confidence: 99%

“…Our home-made setup is schematically described in Figure 1. The apparatus has been previously described (Chen et al 2010), and only slight modifications were needed for application to banknotes. Briefly, the radiation source was a solid state OPO laser (NT342/3/UVE EKSPLA, Vilnius, Lithuania), generating wavelengths in the range of 210-350 nm at a 10 Hz repetition rate and 5 ns pulse duration.…”

Section: Mees Apparatus and Spectramentioning

confidence: 99%

“…It was proved to be more sensitive and more informative than most common optical spectroscopies. [22][23][24][25][26][27] This method can directly be applied to surfaces, without any preparations and preprocessing. Thus far, it was applied to detecting a variety of compounds, including polycyclic aromatic hydrocarbons (PAH), pesticides, pharmaceutical compounds, explosives, and narcotic drugs.…”

Section: Mees Apparatus and Spectramentioning

confidence: 99%

“…MEES is a quantitative analytical spectroscopy, based on detection of photoelectrons extracted in multiphoton process, as a function of laser irradiation wavelength. It was proved to be more sensitive and more informative than most common optical spectroscopies [22][23][24][25][26][27]. This method can directly be applied to surfaces, without any preparations and preprocessing.…”

Section: Introductionmentioning

confidence: 99%

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

2021

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Mees Apparatus and Spectramentioning

confidence: 99%

Section: Mees Apparatus and Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2021

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Current Awareness in Drug Testing and Analysis

2010

Drug Testing and Analysis

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In order to keep subscribers up‐to‐date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of drug testing and analysis. Each bibliography is divided into 18 sections: 1 Reviews; 2 Sports doping ‐ General; 3 Steroids; 4 Peptides; 5 Diuretics; 6 CNS agents; 7 Equine; 8 Recreational drugs ‐ General; 9 Stimulants; 10 Hallucinogens; 11 Narcotics; 12 Forensics; 13 Alcohol; 14 Tobacco; 15 Homeland security; 16 Workplace; 17 Product authenticity; 18 Techniques. Within each section, articles are listed in alphabetical order with respect to author. If, in the preceding period, no publications are located relevant to any one of these headings, that section will be omitted.

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A quantitative chemiluminescent assay for analysis of peroxide-based explosives

et al. 2011

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A quantitative chemiluminescent method, enabling indirect identification of the peroxide-based explosives TATP (triacetone triperoxide) and HMTD (hexamethylene triperoxide diamine) has been developed. Treatment of these compounds with acidic solutions produced peroxides, which were transformed into radical derivatives by horseradish peroxidase (HRP) and then quantified by measuring the light emitted during their oxidation of luminol. The method was first developed in the microplate format and later optimized for a portable luminometer, to enable rapid application of the assay directly on site. When the portable luminometer was used each analysis took only 5-10 min. The method had good selectivity, sensitivity, and reproducibility; in the microplate format the limits of detection (LOD) and quantification (LOQ) were 40 and 50 ng mL(-1), respectively, for both TATP and HMTD. When the portable luminometer was used the LOD and LOQ were 50 and 100 ng mL(-1), respectively, for both compounds. Introduction of light emission-enhancing compounds did not improve the analytical performance of the assay. Imprecision (CV values) was always below 10%. Recovery varied rapidly with time, with an average value of 78% after 5 min. No false-positive result was detected on measurement of a variety of samples; this is an important feature for analysis on site. The method was applied both to contaminated materials and to fortified soil samples, simulating operational conditions.

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

Cited by 12 publications

References 16 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)

Current Awareness in Drug Testing and Analysis

A quantitative chemiluminescent assay for analysis of peroxide-based explosives

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