Finally, both ethyl halide cations also show evidence of a minor C-C bond fission process to form CH2X+ + CH3 products. Powered by Pure, Scopus & Elsevier Fingerprint Engine™ © 2020 Elsevier B.V. We use cookies to help provide and enhance our service and tailor content. 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. 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. Information about reproducing material from RSC articles with different licences 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. Get the latest public health information from CDC: https://www.coronavirus.gov. Khalid A. Khan,, Nicholas Camillone III, and. Lipciuc ML, Gardiner SH, Karsili TNV, Lee JWL, Heathcote D, Ashfold MNR, Vallance C. J Chem Phys. Time-offlight 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. with the reproduced material. @article{42e94c4b302746e8b5476526ecc8cbc4. If you are not the author of this article and you wish to reproduce material from 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. Your Mendeley pairing has expired. Phys. 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. SH Gardiner, TN Karsili, ML Lipciuc, E Wilman, MN Ashfold and C Vallance, Full formally request permission using Copyright Clearance Center. 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. 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. 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. Finally, both ethyl halide cations also show evidence of a minor C-C bond fission process to form CH2X+ + CH3 products. Get article recommendations from ACS based on references in your Mendeley library. 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. Finally, both ethyl halide cations also show evidence of a minor C–C bond fission process to form CH2X+ + CH3 products. Epub 2007 May 29. BibTex; Full citation; Abstract . NIH Temperature-programmed desorption measurements indicate that this species is molecularly adsorbed with a binding energy of 0.43 eV. After photoinduced C−Br bond cleavage two channels for ethyl fragments ejected are observed in the TOF:  one resulting from direct ejection along the C−Br bond with a kinetic energy that varies from 0.6 to 1.1 eV, depending upon incident excitation wavelength, and the other, resulting from transient scattering from the surface potential energy well with a kinetic energy of 0.4 eV. Fetching data from CrossRef. The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. In all cases the Ref. By SH Gardiner, TN Karsili, ML Lipciuc, E Wilman, MN Ashfold and C Vallance. School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK. Request.  |  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. Imaging studies of the photodissociation of H2S+ cations. Temperature-programmed desorption measurements indicate that this species is molecularly adsorbed with a binding energy of 0.43 eV. 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. The photodissociation dynamics of ethyl bromide … https://doi.org/10.1016/j.susc.2005.11.018, https://doi.org/10.1016/S0009-2614(02)00287-7, https://doi.org/10.1016/S0039-6028(01)01635-1, https://doi.org/10.1103/PhysRevLett.87.056101, https://doi.org/10.1016/S0039-6028(00)00388-5, https://doi.org/10.1016/S0039-6028(00)00308-3, https://doi.org/10.1016/S0039-6028(99)00222-8. Fragmentation dynamics of the ethyl bromide and ethyl iodide cations: a velocity-map imaging study Sara H. Gardiner, Tolga N. V. Karsili, M. Laura Lipciuc, Edward Wilman, Michael N. R. Ashfold , … This article is part of the themed collection: For reproduction of material from all other RSC journals and books: For reproduction of material from all other RSC journals. 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. I. Illustrations of the role of nuclear spin. 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. 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. Get the latest research from NIH: https://www.nih.gov/coronavirus. Fragmentation dynamics of the ethyl bromide and ethyl iodide cations: a velocity-map imaging study. Time-offlight 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. Go to our National Center for Biotechnology Information, Unable to load your collection due to an error, Unable to load your delegates due to an error. the Altmetric Attention Score and how the score is calculated. The photodissociation dynamics of ethyl bromide and ethyl iodide cations (C2H5Br+ and C2H5I+) have been studied. N. Camillone, K. A. Khan, P. J. Lasky, L. Wu, J. E. Moryl, R. M. Osgood. 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. 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. This is a nucleophilic substitution mechanism of a cyanide (CN –) ion.This mechanism occurs when potassium cyanide (KCN) is added to a warmed haloalkane (in this case ethyl bromide, though any haloalkane can be used). Finally, both ethyl halide cations also show evidence of a minor C-C bond fission process to form CH2X+ + CH3 products. The photodissociation dynamics of ethyl bromide … 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. Photofragmentation dynamics of N,N-dimethylformamide following excitation at 193 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.

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