The Experts below are selected from a list of 158367 Experts worldwide ranked by ideXlab platform
Robert Fromter - One of the best experts on this subject based on the ideXlab platform.
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single pulse resonant magnetic scattering using a soft x ray free electron laser
Physical Review B, 2010Co-Authors: C Gutt, L M Stadler, S Streitnierobisch, Bastian Pfau, Christian M Gunther, Rene Konnecke, Robert FromterAbstract:We report on single-pulse resonant magnetic scattering experiments using soft x-ray pulses generated by the free-electron laser FLASH at DESY. We could record a magnetic diffraction pattern from a Co/Pt multilayer sample at the Co M2,3 edge with a single 30-fs-long FEL pulse. The analysis of the magnetic small-angle scattering signal for subsequent pulses indicates a Threshold Energy density below which there is no indication that the magnetic properties of the sample might be altered. DOI: 10.1103/PhysRevB.81.100401
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single pulse resonant magnetic scattering using a soft x ray free electron laser
Physical Review B, 2010Co-Authors: C Gutt, L M Stadler, S Streitnierobisch, Bastian Pfau, Christian M Gunther, Rene Konnecke, Robert FromterAbstract:We report on single-pulse resonant magnetic scattering experiments using soft x-ray pulses generated by the free-electron laser FLASH at DESY. We could record a magnetic diffraction pattern from a Co/Pt multilayer sample at the $\text{Co}\text{ }{M}_{2,3}$ edge with a single 30-fs-long FEL pulse. The analysis of the magnetic small-angle scattering signal for subsequent pulses indicates a Threshold Energy density below which there is no indication that the magnetic properties of the sample might be altered.
Bert E Holmes - One of the best experts on this subject based on the ideXlab platform.
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effects of cf3 and ch3 groups on the Threshold Energy for the unimolecular interchange reaction of cl and f atoms in cf3chfch2cl and ch3chfch2cl
Journal of Physical Chemistry A, 2014Co-Authors: Corey E Mcclintock, Kylie C Smith, George L Heard, D W Setser, Bert E HolmesAbstract:The recombination reactions of CH2Cl radicals with CF3CHF and with CH3CHF radicals were used to generate CF3CHFCH2Cl and CH3CHFCH2Cl molecules with 90–92 kcal mol–1 of vibrational Energy. The experimental rate constants for elimination of HCl and HF and the interchange of Cl and F atoms were measured and compared to RRKM calculated rate constants to assign the Threshold Energy for each unimolecular reaction channel. The Cl/F interchange reaction is approximately 18% of the total unimolecular reaction for both molecules. The product branching ratios and some rate constants also could be measured for the unimolecular reactions of the rearranged molecules, CF3CHClCH2F and CH3CHClCH2F. The most important result is that the CH3 group lowers the Threshold for Cl/F interchange relative to CH2FCD2Cl, as expected for an electron-density donating group, and the CF3 group, an electron-density withdrawing group, increases the Threshold Energy relative to CH2FCD2Cl. The CH3 and CF3 groups alter the Threshold energies ...
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unimolecular rate constant and Threshold Energy for the hf elimination from chemically activated cf3chfcf3
Journal of Physical Chemistry A, 2010Co-Authors: Juliana R Duncan, Michael S Roach, Brooke Sibila Stiles, Bert E HolmesAbstract:Combination of CF(3)CHF and CF(3) radicals at room temperature generated chemically activated CF(3)CHFCF(3) molecules with 95 +/- 3 kcal/mol of internal Energy that decompose by loss of HF, initially attached to adjacent carbons, with an experimental unimolecular rate constant of (4.5 +/- 1.1) x 10(2) s(-1). Density functional theory was used to model the unimolecular rate constant for HF elimination, k(HF), to determine a Threshold Energy of 75 +/- 2 kcal/mol.
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Threshold Energy and unimolecular rate constant for elimination of hf from chemically activated cf3cf2ch3 effect of the cf3substituent on the α carbon
Journal of Physical Chemistry A, 1997Co-Authors: Bridget J Mcdoniel, Bert E HolmesAbstract:Methyl and CF3CF2 radicals were combined to form chemically activated CF3CF2CH3 with 104 kcal/mol of internal Energy, and the experimental rate constant for unimolecular 1,2-dehydrofluorination was 4.5 × 105 s-1. Fitting the calculated rate constant for HF elimination from RRKM theory to the experimental value provided a Threshold Energy, Eo, of 68.5 kcal/mol. Comparing this Threshold Energy to those for CF2HCH3, CH3CF2CH3, CF2ClCH3, and CF3CH3 shows that replacing the α-H of CF2HCH3 with CH3 lowered the Eo by 7 kcal/mol and replacing with CF3, Cl, or F raises the Eo about 8 kcal/mol. The CF3 substituent, an electron acceptor, increased the Eo by an amount nearly equal to that with F and Cl substituents, suggesting that halogen substituents exert a similar inductive effect at the α-carbon that loses electron density as the transition state forms. These proposals will be compared to recent calculations of the carbon's atomic charges in the reactant and transition state.
Hiroshi Yoshikawa - One of the best experts on this subject based on the ideXlab platform.
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influence of Energy and wavelength on femtosecond laser induced nucleation of protein
Chemical Physics Letters, 2011Co-Authors: Ryota Murai, Hiroshi Yoshikawa, Shigeru Sugiyama, Hiroaki Adachi, Hitoshi Hasenaka, Yoshinori Takahashi, Mihoko Maruyama, Kazufumi TakanoAbstract:Abstract The influence of Energy and wavelength on femtosecond laser-induced nucleation of protein was systematically investigated with Hen Egg White Lysozyme and Glucose Isomerase at two different wavelengths, λ = 780 nm and 260 nm. We found that the enhancement of nucleation probability at a laser wavelength of λ = 780 nm was comparable with that at λ = 260 nm, which produces more protein dimers. The nucleation was dependent on laser pulse Energy and could be induced beyond the Threshold Energy of cavitation bubbles. These results indicate that the photophysical processes like cavitation bubbles formation are main triggers for the femtosecond laser-induced nucleation.
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laser Energy dependence on femtosecond laser induced nucleation of protein
Applied Physics A, 2008Co-Authors: Hiroshi Yoshikawa, Ryota Murai, Syou Maki, Tomoya Kitatani, Shigeru Sugiyama, Gen Sazaki, Hiroaki Adachi, Tsuyoshi Inoue, Hiroyoshi Matsumura, Kazufumi TakanoAbstract:We have investigated femtosecond laser-induced nucleation of hen egg-white lysozyme (HEWL) as a function of the laser pulse Energy and pulse time width. This is the first recorded study to confirm that the femtosecond laser-induced nucleation of HEWL can be induced at a specific Threshold laser Energy. The Threshold Energy is comparable to that of cavitation bubble generation. The results strongly suggest that morphological changes in the solution are key factors for protein nucleation.
Christian M Gunther - One of the best experts on this subject based on the ideXlab platform.
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single pulse resonant magnetic scattering using a soft x ray free electron laser
Physical Review B, 2010Co-Authors: C Gutt, L M Stadler, S Streitnierobisch, Bastian Pfau, Christian M Gunther, Rene Konnecke, Robert FromterAbstract:We report on single-pulse resonant magnetic scattering experiments using soft x-ray pulses generated by the free-electron laser FLASH at DESY. We could record a magnetic diffraction pattern from a Co/Pt multilayer sample at the Co M2,3 edge with a single 30-fs-long FEL pulse. The analysis of the magnetic small-angle scattering signal for subsequent pulses indicates a Threshold Energy density below which there is no indication that the magnetic properties of the sample might be altered. DOI: 10.1103/PhysRevB.81.100401
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single pulse resonant magnetic scattering using a soft x ray free electron laser
Physical Review B, 2010Co-Authors: C Gutt, L M Stadler, S Streitnierobisch, Bastian Pfau, Christian M Gunther, Rene Konnecke, Robert FromterAbstract:We report on single-pulse resonant magnetic scattering experiments using soft x-ray pulses generated by the free-electron laser FLASH at DESY. We could record a magnetic diffraction pattern from a Co/Pt multilayer sample at the $\text{Co}\text{ }{M}_{2,3}$ edge with a single 30-fs-long FEL pulse. The analysis of the magnetic small-angle scattering signal for subsequent pulses indicates a Threshold Energy density below which there is no indication that the magnetic properties of the sample might be altered.
Bastian Pfau - One of the best experts on this subject based on the ideXlab platform.
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single pulse resonant magnetic scattering using a soft x ray free electron laser
Physical Review B, 2010Co-Authors: C Gutt, L M Stadler, S Streitnierobisch, Bastian Pfau, Christian M Gunther, Rene Konnecke, Robert FromterAbstract:We report on single-pulse resonant magnetic scattering experiments using soft x-ray pulses generated by the free-electron laser FLASH at DESY. We could record a magnetic diffraction pattern from a Co/Pt multilayer sample at the Co M2,3 edge with a single 30-fs-long FEL pulse. The analysis of the magnetic small-angle scattering signal for subsequent pulses indicates a Threshold Energy density below which there is no indication that the magnetic properties of the sample might be altered. DOI: 10.1103/PhysRevB.81.100401
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single pulse resonant magnetic scattering using a soft x ray free electron laser
Physical Review B, 2010Co-Authors: C Gutt, L M Stadler, S Streitnierobisch, Bastian Pfau, Christian M Gunther, Rene Konnecke, Robert FromterAbstract:We report on single-pulse resonant magnetic scattering experiments using soft x-ray pulses generated by the free-electron laser FLASH at DESY. We could record a magnetic diffraction pattern from a Co/Pt multilayer sample at the $\text{Co}\text{ }{M}_{2,3}$ edge with a single 30-fs-long FEL pulse. The analysis of the magnetic small-angle scattering signal for subsequent pulses indicates a Threshold Energy density below which there is no indication that the magnetic properties of the sample might be altered.
