M. Foryś

Bio: M. Foryś is an academic researcher. The author has an hindex of 1, co-authored 2 publications receiving 9 citations.

Thermal electron capture by some halopropanes

Abstract: Thermal electron attachment rate constants for CF 3 CHClCH 3 , CF 2 ClCFClCF 3 and CBrF 2 CH 2 CH 2 Br have been measured with electron swarm method. Corresponding rate constants are equal to 7.6×10 −11 , 5.5×10 −9 and 1.5×10 −8 cm 3 molecule −1 s −1 , respectively. The dissociative electron attachment (DEA) spectra for nine haloalkanes have been determined using negative ion mass spectrometry. The correlation between rate constants, position of the DEA peaks and vertical attachment energy (VAE) available in literature has been demonstrated.

Thermal Electron Capture by some Halocarbons

Abstract: Halocarbons play important and very disgraceful role in the atmosphere not only destroying the ozone layer but also acting as the greenhouse agents. To diminish their negative influence on the environment it is necessary to find the methods which allow to destroy existing in the atmosphere halocarbons. There are some attempts for develop such procedure. The proposed techniques include several plasma methods: by an electron beam or by using a free localized microwave discharges1. The key processes in these techniques are electron attachment reactions. So, for modeling the system it is necessary to know the rate of these processes, their mechanism and products.

Rate constants of electron attachment to chlorobenzenes measured by atmospheric pressure nitrogen corona discharge electron attachment ion mobility spectrometry

Abstract: Using atmospheric pressure nitrogen corona discharge electron attachment ion mobility spectrometry (APNCD-EA-IMS), the rate constants of electron attachment to 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, 1,2,4-trichlorobenzene and α,α,α-trichlorotoluene have been determined at ambient temperature as a function of the average electron energy in the range from 0.35 to 0.65 eV based on the experimental measurements of the negative ion mobility spectra. The rate constants are in the order of magnitude of ∼10 −9 cm 3 molecule −1 s −1 . The ability of the dichlorobenzene isomers to capture the electrons has been found to decrease following the order of 1,2-chlorobenzene, 1,3-chlorobenzene and 1,4-chlorobenzene, which is different from previously reported results in the literature. For electron attachment to 1,2,4-trichlorobenzene and α,α,α-trichlorotoluene, the experimental measurements show that α,α,α-trichlorotoluene has a higher rate constant than 1,2,4-trichlorobenzene.

Thermal electron capture by some halopropanes

Abstract: Thermal electron attachment rate constants for CF 3 CHClCH 3 , CF 2 ClCFClCF 3 and CBrF 2 CH 2 CH 2 Br have been measured with electron swarm method. Corresponding rate constants are equal to 7.6×10 −11 , 5.5×10 −9 and 1.5×10 −8 cm 3 molecule −1 s −1 , respectively. The dissociative electron attachment (DEA) spectra for nine haloalkanes have been determined using negative ion mass spectrometry. The correlation between rate constants, position of the DEA peaks and vertical attachment energy (VAE) available in literature has been demonstrated.

Electron attachment rate constant measurement by photoemission electron attachment ion mobility spectrometry(PE-EA-IMS

Abstract: Photoemission electron attachment ion mobility spectrometry (PE-EA-IMS), with a source of photoelectrons induced by vacuum ultraviolet radiation on a metal surface, has been developed to study electron attachment reaction at atmospheric pressure using nitrogen as the buffer gas. Based on the negative ion mobility spectra, the rate constants for electron attachment to tetrachloromethane and chloroform were measured at ambient temperature as a function of the average electron energy in the range from 0.29 to 0.96 eV. The experimental results are in good agreement with the data reported in the literature.

Electron affinities from gas chromatography electron capture detector and negative ion mass spectrometry responses and complementary methods.

Abstract: The use of the electron-capture detector, ECD, to measure molecular electron affinities and kinetic parameters for reactions of thermal electrons with molecules at atmospheric pressure separated by chromatography and the sensitive and selective quantitative analysis of certain classes molecules are reviewed. The evaluated ground state electron affinities of the main group elements and diatomic molecules from slightly positive, 0+, to 3.6 eV are summarized. The electron affinities of twenty-seven superoxide states determined from pulsed discharge ECD and other methods are used to calculate one dimensional potential energy curves in agreement with theory. Advances in literature searches have uncovered ECD data in dissertations and theses and in the Russian and Japanese literature. These data, unpublished radioactive and pulsed discharge ECD thermal data from the University of Houston laboratories are used to report and evaluate electron affinities. The accuracy and precision of ECD electron affinities of organic molecules are identified and tabulated so that they can be added to compilations. A procedure for calculating the temperature dependence of electron molecule reactions is presented using kinetic and thermodynamic data. These are used toselect the most appropriate equipment and conditions for ECD analyses and physical determinations.

Electron-attachment processes

Abstract: Topics covered include: (1) modes of production of negative ions, (2) techniques for the study of electron attachment processes, (3) dissociative electron attachment to ground-state molecules, (4) dissociative electron attachment to hot molecules (effects of temperature on dissociative electron attachment), (5) molecular parent negative ions, and (6) negative ions formed by ion-pair processes and by collisions of molecules with ground state and Rydberg atoms.