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Fisher D, Bulatov V, Schechter I. Application of Multiphoton Electron Extraction Spectroscopy (MEES) to Printed Document Forensics. TALANTA OPEN 2022. [DOI: 10.1016/j.talo.2022.100094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Tang S, Vinerot N, Bulatov V, Yavetz-Chen Y, Schechter I. Multiphoton electron extraction spectroscopy and its comparison with other spectroscopies for direct detection of solids under ambient conditions. Anal Bioanal Chem 2016; 408:8037-8051. [PMID: 27585917 DOI: 10.1007/s00216-016-9904-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Revised: 08/19/2016] [Accepted: 08/24/2016] [Indexed: 11/27/2022]
Abstract
Multiphoton electron extraction spectroscopy (MEES) is an analytical method for direct analysis of solids under ambient conditions in which the samples are irradiated by short UV laser pulses and the photocharges emitted are recorded as a function of the laser wavelength. The method is very sensitive, and many peaks are observed at wavelengths that are in resonance with the surface molecules. The analytical capabilities of MEES have recently been demonstrated, and here we perform a systematic comparison with some traditional spectroscopies that are commonly applied to material analysis. These include absorption, reflection, excitation and emission fluorescence, Raman, Fourier transform IR, and Fourier transform near-IR spectroscopies. The comparison is conducted for powders and for thin films of compounds that are active in all spectroscopies tested. Besides the obvious spectral parameters (signal-to-noise ratio, peak density, and resulting limits of detection), we introduce two additional variables-the spectral quality and the spectral quality density-that represent our intuitive perception of the analytical value of a spectrum. It is shown that by most parameters MEES is a superior analytical tool to the other methods tested for both sample morphologies.
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Affiliation(s)
- Shisong Tang
- Research Center for Analytical Sciences, Northeastern University, Shenyang, 110819, China
| | - Nataly Vinerot
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200, Israel
| | - Valery Bulatov
- Research Center for Analytical Sciences, Northeastern University, Shenyang, 110819, China
| | - Yehuda Yavetz-Chen
- Research Center for Analytical Sciences, Northeastern University, Shenyang, 110819, China
| | - Israel Schechter
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 3200, Israel.
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Detection and mapping of trace explosives on surfaces under ambient conditions using multiphoton electron extraction spectroscopy (MEES). Talanta 2016; 155:235-44. [DOI: 10.1016/j.talanta.2016.04.027] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Revised: 04/09/2016] [Accepted: 04/11/2016] [Indexed: 11/18/2022]
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Chen Y, Bulatov V, Vinerot N, Schechter I. Multiphoton ionization spectroscopy as a diagnostic technique of surfaces under ambient conditions. Anal Chem 2010; 82:3454-6. [PMID: 20380444 DOI: 10.1021/ac100539x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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.
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Affiliation(s)
- Yuheng Chen
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology, Haifa 32000, Israel
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Oliveira MB, Oliveira VL, Coutinho JAP, Queimada AJ. Thermodynamic Modeling of the Aqueous Solubility of PAHs. Ind Eng Chem Res 2009. [DOI: 10.1021/ie900011g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mariana B. Oliveira
- CICECO, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Vera L. Oliveira
- CICECO, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - João A. P. Coutinho
- CICECO, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - António J. Queimada
- LSRE—Laboratory of Separation and Reaction Engineering, Faculdade de Engenharia, Universidade do Porto, Rua do Doutor Roberto Frias, 4200-465 Porto, Portugal
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Sato M, Harata A, Hatano Y, Ogawa T, Kaieda T, Ohmukai K, Kawazumi H. Acid−Base Equilibrium Constants and Distribution Coefficients of Aminopyrene between the Surface and Bulk of Liquid Water as Studied by a Laser Two-Photon Ionization Technique. J Phys Chem B 2004. [DOI: 10.1021/jp0491616] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miki Sato
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan
| | - Akira Harata
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan
| | - Yoshihiko Hatano
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan
| | - Teiichiro Ogawa
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan
| | - Takeshi Kaieda
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan
| | - Kohshin Ohmukai
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan
| | - Hirofumi Kawazumi
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan
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Reza J, Trejo A, Vera-Avila LE. Determination of the temperature dependence of water solubilities of polycyclic aromatic hydrocarbons by a generator column-on-line solid-phase extraction-liquid chromatographic method. CHEMOSPHERE 2002; 47:933-945. [PMID: 12108700 DOI: 10.1016/s0045-6535(02)00069-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
An improved dynamic coupled column liquid chromatographic (DCCLC) technique for determining water solubility data of hydrophobic compounds is presented. The technique is based on pumping water through a thermostated generator column in order to generate emulsion-free, saturated aqueous solutions of the compound under study. Through a switching valve system the solute in the aqueous solution is extracted and concentrated by an on-line solid-phase extraction process and subsequently eluted and analyzed by high performance liquid chromatography (fluorescence detection coupled to photodiode array detection). The improvements carried out to the original DCCLC technique have given rise to savings in time for the experimental work and increased sensitivity during the detection and quantification stage. Applicability of the method for studying highly hydrophobic substances is demonstrated by determining water solubility of anthracene and pyrene in the temperature range of 8.9-49.9 and 8.5-32.2 degrees C, respectively. The measured water solubilities are in good agreement with the best available literature data. The method has also been applied to the determination of water solubility of m-terphenyl, 9, 10-dihydrophenanthrene and guaiazulene, in the temperature range of 4.8-49.9, 4.8-25.0, and 4.5-29.9 degrees C, respectively. The uncertainty in the Sw values determined in this work ranged from 0.7% to 4.6%. The experimental water solubility data, as a function of temperature, are fitted to the equation In Sw = A + B/T; where Sw and T are given in mole fraction and Kelvin, respectively.
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Affiliation(s)
- Joel Reza
- Instituto Mexicano del Petróleo, Programa de Ingeniería Molecular, Area de Investigación en Termofísica, México DF, Mexico.
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Ogawa T, Mizutani M, Inoue T. Dependence of the laser two-photon ionization process in solution on the laser pulse width. Anal Chem 2001; 73:2066-9. [PMID: 11354492 DOI: 10.1021/ac001055m] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The laser two-photon ionization process has been investigated using simultaneous irradiation of an UV beam and an IR beam. When the laser pulse width was 300 ps, it proceeded through a geminate pair state (a stepwise process), as indicated by the signal enhancement with simultaneous irradiation of the two laser beams. Although no signal enhancement was observed when the laser pulse width was 100 fs, and because molecules with no absorption at the laser wavelength showed an intense signal, the two-photon ionization excited by a femtosecond laser should proceed through a simultaneous two-photon process. The detection limit was quite susceptible to the laser fluctuations.
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Affiliation(s)
- T Ogawa
- Department of Molecular Science and Technology, Kyushu University, Fukuoka, Japan
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Sato M, Kaieda T, Ohmukai K, Kawazumi H, Harata A, Ogawa T. Acid−Base Equilibrium Constants at the Water Surface and Distribution Coefficients between the Surface and the Bulk as Studied by the Laser Two-Photon Ionization Technique. J Phys Chem B 2000. [DOI: 10.1021/jp001646g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miki Sato
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kinki University in Kyushu, Iizuka, Fukuoka 820-8555, Japan
| | - Takeshi Kaieda
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kinki University in Kyushu, Iizuka, Fukuoka 820-8555, Japan
| | - Kohshin Ohmukai
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kinki University in Kyushu, Iizuka, Fukuoka 820-8555, Japan
| | - Hirofumi Kawazumi
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kinki University in Kyushu, Iizuka, Fukuoka 820-8555, Japan
| | - Akira Harata
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kinki University in Kyushu, Iizuka, Fukuoka 820-8555, Japan
| | - Teiichiro Ogawa
- Department of Molecular and Material Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kinki University in Kyushu, Iizuka, Fukuoka 820-8555, Japan
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