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Study of Atmospheric Pressure Chemical Ionization Mechanism in Corona Discharge Ion Source with and without NH3 Dopant by Ion Mobility Spectrometry combined with Mass Spectrometry: A Theoretical and Experimental Study

2019-01-17
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J. Phys. Chem. A, 2019, 123 (1), pp 313–322 DOI: 10.1021/acs.jpca.8b11417

Ionization of 2-nonanone, cyclopentanone, acetophenone, pyridine, and di-tert-butylpyridine (DTBP) in a corona discharge (CD) atmospheric pressure chemical ionization (APCI) ion source was studied using ion mobility (IMS) and time-of-flight mass spectrometry (TOF–MS). The IMS and MS spectra were recorded in the absence and presence of ammonia dopant. Without NH3dopant, the reactant ion (RI) was H+(H2O)n, n = 3,4, and the MH+(H2O)x clusters were produced as product ions. Modeling of hydration shows that the amount of hydration (x) depends on basicity of M, temperature and water concentration of drift tube. In the presence of ammonia (NH4+(H2O)nas RI) two kinds of product ions, MH+(H2O)x and MNH4+(H2O)x, were produced, depending on the basicity of M. With NH4+(H2O)n as RI, the product ions of pyridine and DTBP with higher basicity were MH+(H2O)x while cyclopentanone, 2-nonanone, and acetophenone with lower basicity produce MNH4+(H2O)x. To interpret the formation of product ions, the interaction energies of M–H+, H+–NH3, and H+–OH2 in the M–H+–NH3 and M–H+–OH2 and M–H+–M complexes were computed by B3LYP/6-311++G(d,p) method. It was found that for a molecule M with high basicity, the M–H+ interaction is strong leading in weakening of the H+–NH3, and H+–OH2 interactions in the M–H+–NH3 and M–H+–OH2 complexes.

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Security Mission Information & Innovation Group – SMI2G

2019-01-17
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MaSaTECH will participate on SMI2G meeting, 29-30th January 2019, Brussels

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Explosives detection by Portable-Advanced Ion Mobility Spectrometer implemented to Mobile Robotic Arm

2018-11-30
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We are proud that Portable Advanced Ion Mobility Spectrometer was successfully tested and implemented to mobile robotic arm by group of Dr. Jankiewicz from Institute of Optoelectronics, Warsaw Military University of Technology. The PAIMS was successfully tested for remote detection of explosives from various surfaces. The high sensitivity of PAIMS was supported by our unique Laser Desorption technique developed for analysis of solids and surfaces.

Fast Quantification of Whisky Lactone in Oak Wood by Advanced Ion Mobility Spectrometer – AIMS

2018-04-27
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Whisky lactone (WL) in oak staves / barrels has the biggest share in the resulting taste of beverages. The quantity of WL in oak wood have strong effect on quality of final products. Based on WL quantity, the barrel’s staves are divided into ten categories. This categories are category1 (0-7 μg/g), ......, category10 (63-70 μg/g). In this application report we are introducing the ion mobility spectrometer as useful tool for fast monitoring and quantification of whisky lactone in oak wood.

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Separation of Isomeric Compounds by Advanced Ion Mobility Spectrometer - AIMS

2018-01-12
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The ion mobility spectrometry technique offers advantages like high sensitivity (ppb range), fast response (ms range), compact design, operation in atmospheric pressure and ability to separate the isomeric compounds. As ion mobility spectrometers do not work in vacuum, the ion movement is not straightforward. There occur huge numbers of ion-molecule interactions between charged ions and neutral particles of a drift gas. Thus the ion separation in IMS is not based just on their mass but also on their cross section. This gives an advantage to the IMS technique for fast separation of isomers. In this Lab-Report we will demonstrate the ability of AIMS technique to separate the isomeric compounds.

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Laser Desorption-Ion Mobility Spectrometry As a Useful Tool For Surface Analysis

2016
surface analysis

INNMS 2016 Moscow - Invited lecture

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Laser desorption-ion mobility spectrometry as a useful tool for imaging of thin layer chromatography surface

2016
material analysis

Journal of Chromatography A, Volume 1459, 12 August 2016, p. 145–151. DOI: 10.1016/j.chroma.2016.06.069.

We present a novel method for coupling thin layer chromatography (TLC) with ion mobility spectrometry (IMS) using laser desorption technique (LD). After separation of the compounds by TLC, the TLC surface was sampled by the LD-IMS without any further manipulation or preparation. The position of the laser was fixed and the TLC plate was moved in desired directions by the motorized micro-positioning stage. The method was successfully applied to analyze the TLC plates containing explosives (tri nitro toluene, 1,3,5-trinitro- 1,3,5-triazacyclohexane, pentaerythritol tetranitrate, 2,4-dinitro toluene and 3,4-dinitro toluene), amino acids (alanine, proline and isoleucine), nicotine and diphenylamine mixtures and detection limits for these compounds were determined. Combination of TLC with LD-IMS technique offers additional separation dimension, allowing separation of overlapping TLC analytes. The time for TLC sampling by LD-IMS was less than 80 s. The scan rate for LD is adjustable so that fast and effective analysis of the mixtures is possible with the proposed method.

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Direct Liquid Sampling for Corona Discharge Ion Mobility Spectrometry

2015
liquid analysis

Anal. Chem., 2015, 87 (14), p. 7389–7394. DOI: 10.1021/acs.analchem.5b01585.

We present a new technique suitable for direct liquid sampling and analysis by ion mobility spectrometry (IMS). The technique is based on introduction of a droplet stream to the IMS reaction region. The technique was successfully used to detect explosives dissolved in methanol and oil as well as to analyze amino acids and dipeptides. One of the main advantages of this technique is its ability to analyze liquid samples without the requirement of any special solution.

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