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Tadamasa Shida - One of the best experts on this subject based on the ideXlab platform.
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Infrared Spectroscopic Study on Photolysis of Ethyl Iodide in Solid Parahydrogen: Perdeuterated Iodide System†
The Journal of Physical Chemistry A, 2001Co-Authors: Norihito Sogoshi, Tomonari Wakabayashi, Takamasa Momose, Tadamasa ShidaAbstract:Perdeuterated Ethyl Iodide in solid parahydrogen is photolyzed at 4.4 K to find the formation of all deuterated Ethylene, ethane, and Ethyl radical and deuterium Iodide. The temporal change in the ...
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INFRARED SPECTROSCOPIC STUDIES ON PHOTOLYSIS OF Ethyl Iodide IN SOLID PARAHYDROGEN
The Journal of Physical Chemistry A, 1997Co-Authors: Norihito Sogoshi, Tomonari Wakabayashi, Takamasa Momose, Tadamasa ShidaAbstract:The photolysis of Ethyl Iodide in solid parahydrogen leads to the formation of Ethyl radical, Ethylene, and ethane upon near-UV illumination at about 5 K which are characterized by vibrational spectroscopy. The mechanism of the formation of the products is elucidated consistently. Two kinds of Ethylene are discriminated spectroscopically which show distinctly different temporal behaviors during illumination and standing under dark. One of them is attributed to a complex between Ethylene and iodine atom. The present work demonstrates that the cage effect is insignificant in the solid parahydrogen matrix, and a variety of elementary reactions of in situ photolysis can be studied in detail in contrast to conventional rare gas matrices.
Ana C. Soria - One of the best experts on this subject based on the ideXlab platform.
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determination of carbamate phenylurea and phenoxy acid herbicide residues by gas chromatography after potassium tert butoxide dimEthyl sulphoxide Ethyl Iodide derivatization reaction
Journal of Chromatography A, 2008Co-Authors: Esther Crespocorral, M J Santosdelgado, L M Polodiez, Ana C. SoriaAbstract:The usefulness of the potassium tert-butoxide/dimEthyl sulphoxide/Ethyl Iodide reaction with carbamate and phenylurea herbicides, and its application to phenoxy acids as a way to prevent hazards and toxicity of the sodium hydride/dimEthyl sulphoxide/mEthyl Iodide reaction was studied. Using factorial design optimization of this reaction was carried out. A solid-phase extraction method using dimEthyl sulphoxide as eluent on-line with this reaction was developed to determine these herbicides in water samples by gas chromatography-mass spectrometry. Relative standard deviation values were lower than 10% for most of the herbicides in multicomponent trace determinations. Detection limits were in the 0.110-0.652 ng L(-1) concentration range. The validity of the method was confirmed by recovery studies from natural water samples.
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Determination of carbamate, phenylurea and phenoxy acid herbicide residues by gas chromatography after potassium tert-butoxide/dimEthyl sulphoxide/Ethyl Iodide derivatization reaction
Journal of Chromatography A, 2008Co-Authors: Esther Crespo-corral, M.j. Santos-delgado, Luis María Polo-díez, Ana C. SoriaAbstract:The usefulness of the potassium tert-butoxide/dimEthyl sulphoxide/Ethyl Iodide reaction with carbamate and phenylurea herbicides, and its application to phenoxy acids as a way to prevent hazards and toxicity of the sodium hydride/dimEthyl sulphoxide/mEthyl Iodide reaction was studied. Using factorial design optimization of this reaction was carried out. A solid-phase extraction method using dimEthyl sulphoxide as eluent on-line with this reaction was developed to determine these herbicides in water samples by gas chromatography-mass spectrometry. Relative standard deviation values were lower than 10% for most of the herbicides in multicomponent trace determinations. Detection limits were in the 0.110-0.652 ng L(-1) concentration range. The validity of the method was confirmed by recovery studies from natural water samples.
Claire Vallance - One of the best experts on this subject based on the ideXlab platform.
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Dynamics of the A-band ultraviolet photodissociation of mEthyl Iodide and Ethyl Iodide via velocity-map imaging with ‘universal’ detection
Physical chemistry chemical physics : PCCP, 2015Co-Authors: Sara H. Gardiner, M. Laura Lipciuc, Tolga N. V. Karsili, Michael N. R. Ashfold, Claire VallanceAbstract:We report data from a comprehensive investigation into the photodissociation dynamics of mEthyl Iodide and Ethyl Iodide at several wavelengths in the range 236–266 nm, within their respective A-bands. The use of non-resonant single-photon ionization at 118.2 nm allows detection and velocity-map imaging of all fragments, regardless of their vibrotational or electronic state. The resulting photofragment kinetic energy and angular distributions and the quantum yields of ground-state and spin–orbit excited iodine fragments are in good agreement with previous studies employing state-selective detection via REMPI. The data are readily rationalised in terms of three competing dissociation mechanisms. The dominant excitation at all wavelengths studied is via a parallel transition to the 3Q0 state, which either dissociates directly to give an alkyl radical partnered by spin–orbit excited iodine, or undergoes radiationless transfer to the 1Q1 potential surface, where it dissociates to an alkyl radical partnered by iodine in its electronic ground state. Ground state iodine atoms can also be formed by direct dissociation from the 1Q1 or 3Q1 excited states following perpendicular excitation at the shorter and longer wavelength region, respectively, in the current range of interest. The extent of internal excitation of the alkyl fragment varies with dissociation mechanism, and is considerably higher for Ethyl fragments from Ethyl Iodide photolysis than for mEthyl fragments from mEthyl Iodide photolysis. We discuss the relative advantages and disadvantages of single-photon vacuum-ultraviolet ionization relative to the more widely used REMPI detection schemes, and conclude, in agreement with others, that single-photon ionization is a viable detection method for photofragment imaging studies, particularly when studying large molecules possessing multiple fragmentation channels.
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Three-dimensional imaging of carbonyl sulfide and Ethyl Iodide photodissociation using the pixel imaging mass spectrometry camera
The Review of scientific instruments, 2015Co-Authors: Kasra Amini, Sophie Blake, Mark Brouard, Michael Burt, E. Halford, Alexandra Lauer, C. Slater, Jason W. L. Lee, Claire VallanceAbstract:The Pixel Imaging Mass Spectrometry (PImMS) camera is used in proof-of-principle three-dimensional imaging experiments on the photodissociation of carbonyl sulfide and Ethyl Iodide at wavelengths around 230 nm and 245 nm, respectively. Coupling the PImMS camera with DC-sliced velocity-map imaging allows the complete three-dimensional Newton sphere of photofragment ions to be recorded on each laser pump-probe cycle with a timing precision of 12.5 ns, yielding velocity resolutions along the time-of-flight axis of around 6%–9% in the applications presented.
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Fragmentation dynamics of the Ethyl bromide and Ethyl Iodide cations: a velocity-map imaging study
Physical chemistry chemical physics : PCCP, 2014Co-Authors: Sara H. Gardiner, M. Laura Lipciuc, Tolga N. V. Karsili, Michael N. R. Ashfold, E. Wilman, Claire VallanceAbstract:The photodissociation dynamics of Ethyl bromide and Ethyl Iodide cations (C2H5Br+ and C2H5I+) have been studied. Ethyl halide cations were formed through vacuum ultraviolet (VUV) photoionization of the respective neutral parent molecules at 118.2 nm, and were photolysed at a number of ultraviolet (UV) photolysis wavelengths, including 355 nm and wavelengths in the range from 236 to 266 nm. Time-of-flight mass spectra and velocity-map images have been acquired for all fragment ions and for ground (Br) and spin–orbit excited (Br*) bromine atom products, allowing multiple fragmentation pathways to be investigated. The experimental studies are complemented by spin–orbit resolved ab initio calculations of cuts through the potential energy surfaces (along the RC–Br/I stretch coordinate) for the ground and first few excited states of the respective cations. Analysis of the velocity-map images indicates that photoexcited C2H5Br+ cations undergo prompt C–Br bond fission to form predominantly C2H5+ + Br* products with a near-limiting ‘parallel’ recoil velocity distribution. The observed C2H3+ + H2 + Br product channel is thought to arise via unimolecular decay of highly internally excited C2H5+ products formed following radiationless transfer from the initial excited state populated by photon absorption. Broadly similar behaviour is observed in the case of C2H5I+, along with an additional energetically accessible C–I bond fission channel to form C2H5 + I+ products. HX (X = Br, I) elimination from the highly internally excited C2H5X+ cation is deemed the most probable route to forming the C2H4+ fragment ions observed from both cations. Finally, both Ethyl halide cations also show evidence of a minor C–C bond fission process to form CH2X+ + CH3 products.
Norihito Sogoshi - One of the best experts on this subject based on the ideXlab platform.
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Infrared Spectroscopic Study on Photolysis of Ethyl Iodide in Solid Parahydrogen: Perdeuterated Iodide System†
The Journal of Physical Chemistry A, 2001Co-Authors: Norihito Sogoshi, Tomonari Wakabayashi, Takamasa Momose, Tadamasa ShidaAbstract:Perdeuterated Ethyl Iodide in solid parahydrogen is photolyzed at 4.4 K to find the formation of all deuterated Ethylene, ethane, and Ethyl radical and deuterium Iodide. The temporal change in the ...
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INFRARED SPECTROSCOPIC STUDIES ON PHOTOLYSIS OF Ethyl Iodide IN SOLID PARAHYDROGEN
The Journal of Physical Chemistry A, 1997Co-Authors: Norihito Sogoshi, Tomonari Wakabayashi, Takamasa Momose, Tadamasa ShidaAbstract:The photolysis of Ethyl Iodide in solid parahydrogen leads to the formation of Ethyl radical, Ethylene, and ethane upon near-UV illumination at about 5 K which are characterized by vibrational spectroscopy. The mechanism of the formation of the products is elucidated consistently. Two kinds of Ethylene are discriminated spectroscopically which show distinctly different temporal behaviors during illumination and standing under dark. One of them is attributed to a complex between Ethylene and iodine atom. The present work demonstrates that the cage effect is insignificant in the solid parahydrogen matrix, and a variety of elementary reactions of in situ photolysis can be studied in detail in contrast to conventional rare gas matrices.
M.-j. Hubin-franskin - One of the best experts on this subject based on the ideXlab platform.
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Electronic excitation and oscillator strength of Ethyl Iodide by VUV photoabsorption and electron energy loss spectroscopy
Journal of Chemical Physics, 1999Co-Authors: Alexandre Giuliani, I C Walker, N. J. Mason, J Delwiche, F. Motte-tollet, N. C. Jones, J. M. Gingell, J. Heinesch, M.-j. Hubin-franskinAbstract:A high resolution VUV photoabsorption spectrum of Ethyl Iodide has been recorded between 4 and 10.2 eV (310–120 nm) using synchrotron radiation. The spectrum consists of a broad structureless absorption band centered at 4.78 eV, followed by a region dominated by excitation of Rydberg states. A high resolution photoelectron spectrum (PES) of the lowest energy ionization band has been obtained and provides ionization energies necessary for identification of related Rydberg-excited states. Also, analysis of the vibrational fine structure in the PES has allowed identification of the normal vibrational modes excited and their wave numbers in the ion. These, in turn, have been used in the assignment of the lowest energy photoabsorption bands arising from electron excitation into the 6s Rydberg orbital. An electron energy loss spectrum has also been recorded from 5.8 to 14.2 eV, under electric-dipole conditions. It confirms the magnitude of the photoabsorption cross section values obtained using the synchrotron radiation and extends the differential and optical oscillator strength values up to 14.2 eV.
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Electronic excitation and oscillator strength of Ethyl Iodide by VUV photoabsorption and electron energy loss spectroscopy
The Journal of Chemical Physics, 1999Co-Authors: Alexandre Giuliani, I C Walker, N. J. Mason, J Delwiche, F. Motte-tollet, N. C. Jones, J. M. Gingell, J. Heinesch, M.-j. Hubin-franskinAbstract:A high resolution VUV photoabsorption spectrum of Ethyl Iodide has been recorded between 4 and 10.2 eV (310–120 nm) using synchrotron radiation. The spectrum consists of a broad structureless absorption band centered at 4.78 eV, followed by a region dominated by excitation of Rydberg states. A high resolution photoelectron spectrum (PES) of the lowest energy ionization band has been obtained and provides ionization energies necessary for identification of related Rydberg-excited states. Also, analysis of the vibrational fine structure in the PES has allowed identification of the normal vibrational modes excited and their wave numbers in the ion. These, in turn, have been used in the assignment of the lowest energy photoabsorption bands arising from electron excitation into the 6s Rydberg orbital. An electron energy loss spectrum has also been recorded from 5.8 to 14.2 eV, under electric-dipole conditions. It confirms the magnitude of the photoabsorption cross section values obtained using the synchrotron ...