The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
A Tureanu - One of the best experts on this subject based on the ideXlab platform.
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non commutativity of space time and the Hydrogen Atom spectrum
European Physical Journal C, 2004Co-Authors: M Chaichian, M M Sheikhjabbari, A TureanuAbstract:There has been disagreement in the literature on whether the Hydrogen Atom spectrum receives any tree-level correction due to non-commutativity. Here we shall clarify this issue and show that indeed a general argument on the structure of the proton as a non-elementary particle leads to the appearance of such corrections. As a showcase, we evaluate the corrections in a simple non-relativistic quark model with a result in full agreement with the previous one we had obtained by considering the electron moving in the external electric field of proton. Thus the previously obtained bound on the non-commutativity parameter, \(\theta < (10^4 {\mathrm {GeV}})^{-2}\), using the Lamb shift data, remains valid.
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Hydrogen Atom spectrum and the lamb shift in noncommutative qed
Physical Review Letters, 2001Co-Authors: M Chaichian, M M Sheikhjabbari, A TureanuAbstract:We have calculated the energy levels of the Hydrogen Atom and as well the Lamb shift within the noncommutative quantum electrodynamics theory. The results show deviations from the usual QED both on the classical and on the quantum levels. On both levels, the deviations depend on the parameter of space/space noncommutativity.
M Chaichian - One of the best experts on this subject based on the ideXlab platform.
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non commutativity of space time and the Hydrogen Atom spectrum
European Physical Journal C, 2004Co-Authors: M Chaichian, M M Sheikhjabbari, A TureanuAbstract:There has been disagreement in the literature on whether the Hydrogen Atom spectrum receives any tree-level correction due to non-commutativity. Here we shall clarify this issue and show that indeed a general argument on the structure of the proton as a non-elementary particle leads to the appearance of such corrections. As a showcase, we evaluate the corrections in a simple non-relativistic quark model with a result in full agreement with the previous one we had obtained by considering the electron moving in the external electric field of proton. Thus the previously obtained bound on the non-commutativity parameter, \(\theta < (10^4 {\mathrm {GeV}})^{-2}\), using the Lamb shift data, remains valid.
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Hydrogen Atom spectrum and the lamb shift in noncommutative qed
Physical Review Letters, 2001Co-Authors: M Chaichian, M M Sheikhjabbari, A TureanuAbstract:We have calculated the energy levels of the Hydrogen Atom and as well the Lamb shift within the noncommutative quantum electrodynamics theory. The results show deviations from the usual QED both on the classical and on the quantum levels. On both levels, the deviations depend on the parameter of space/space noncommutativity.
M M Sheikhjabbari - One of the best experts on this subject based on the ideXlab platform.
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non commutativity of space time and the Hydrogen Atom spectrum
European Physical Journal C, 2004Co-Authors: M Chaichian, M M Sheikhjabbari, A TureanuAbstract:There has been disagreement in the literature on whether the Hydrogen Atom spectrum receives any tree-level correction due to non-commutativity. Here we shall clarify this issue and show that indeed a general argument on the structure of the proton as a non-elementary particle leads to the appearance of such corrections. As a showcase, we evaluate the corrections in a simple non-relativistic quark model with a result in full agreement with the previous one we had obtained by considering the electron moving in the external electric field of proton. Thus the previously obtained bound on the non-commutativity parameter, \(\theta < (10^4 {\mathrm {GeV}})^{-2}\), using the Lamb shift data, remains valid.
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Hydrogen Atom spectrum and the lamb shift in noncommutative qed
Physical Review Letters, 2001Co-Authors: M Chaichian, M M Sheikhjabbari, A TureanuAbstract:We have calculated the energy levels of the Hydrogen Atom and as well the Lamb shift within the noncommutative quantum electrodynamics theory. The results show deviations from the usual QED both on the classical and on the quantum levels. On both levels, the deviations depend on the parameter of space/space noncommutativity.
Dennis P Curran - One of the best experts on this subject based on the ideXlab platform.
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complexes of borane and n heterocyclic carbenes a new class of radical Hydrogen Atom donor
Journal of the American Chemical Society, 2008Co-Authors: Shauhua Ueng, Malika Makhlouf Brahmi, Etienne Derat, Louis Fensterbank, Emmanuel Lacote, Max Malacria, Dennis P CurranAbstract:Calculations suggest that complexes of borane with N-heterocyclic carbenes (NHC) have B−H bond dissocation energies more then 20 kcal/mol less than free borane, diborane, borane−THF, and related complexes. Values are in the range of popular radical Hydrogen Atom donors like tin hydrides (70−80 kcal/mol). The resulting prediction that NHC borane complexes could be used as radical Hydrogen Atom donors was verified by radical deoxygenations of xanthates by using either AIBN or triethylborane as initiator.
John Tsanaktsidis - One of the best experts on this subject based on the ideXlab platform.
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reducing the cost smell and toxicity of the barton reductive decarboxylation chloroform as the Hydrogen Atom source
Organic Letters, 2011Co-Authors: Eun Jung Ko, Paul G Savage, Craig M Williams, John TsanaktsidisAbstract:When used as solvent, chloroform was found to act as a Hydrogen Atom donor in Barton reductive decarboxylation reactions. Chloroform offers a substantial practical advantage over pre-existing Hydrogen Atom donors.
