The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform
Andrew James Murray - One of the best experts on this subject based on the ideXlab platform.
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Super-elastic electron scattering from the laser-excited 41P1 state of calcium at low incident energy
Journal of Physics B: Atomic Molecular and Optical Physics, 2011Co-Authors: Alex Knight-percival, Martyn Hussey, Sarah Jhumka, Andrew James MurrayAbstract:Atomic Collision Parameters have been measured for electron impact excitation of calcium using the superelastic scattering method, at incident electron energies equivalent to ~10eV and ~12eV. The Parameters P lin, L ⊥ and γ were derived for the 4 1 P 1 state, and the related Stokes Parameters determined. The results are compared to previously published calculations from four different theories: a relativistic distorted wave calculation, an R-matrix calculation, an R-matrix theory using B-splines, and a Convergent Close Coupling theory.
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Super-elastic electron scattering from calcium over all angles
Journal of Physics: Conference Series, 2009Co-Authors: William R Macgillivray, Andrew James Murray, Martyn Hussey, G C King, Alex Knight-percival, Sher SattiAbstract:Experimental results are reported for the Atomic Collision Parameters of calcium over all scattering angles as derived from super-elastic scattering experiments performed using a new Magnetic Angle Changing (MAC) spectrometer. Results at 55eV incident energy are compared to theoretical calculations, and new data at 65eV are reported here for the first time.
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Atomic Collision Parameters for Electron De-Excitation of the 4S-3P Transition of Sodium
Journal of Physics B: Atomic Molecular and Optical Physics, 1999Co-Authors: M. Shurgalin, Andrew James Murray, William Robinson Macgillivray, M. C. Standage, Don H. Madison, Kathrin D. Winkler, Igor BrayAbstract:A comparison of measured Stokes Parameters and atomic Collision Parameters (Plin,,L,P+) is made for the excitation and de-excitation of the 3S-3P and 4S-3P transitions of Na respectively, for electrons with incident energies of 22, 30 and 50 eV. These Parameters are obtained from `time-inverse' experiments in which electrons are either superelastically (3P-3S) or inelastically (3P-4S) scattered from the laser prepared 3P state. The data are compared with calculations from a convergent close coupling (CCC) model and a second-order distorted wave Born (DWB2) model. Both models demonstrate very good agreement for 3S-3P transitions. For the 4S-3P transitions, the DWB2 is in better accord with experiment than the CCC for the Plin parameter, the CCC is in excellent agreement with experiment for and L, and neither is in accord with experiment for P+.
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Comparison of electron-atom Collision Parameters for S to P transitions under reversal of energy transfer
Physical Review Letters, 1998Co-Authors: M. Shurgalin, Andrew James Murray, William Robinson Macgillivray, M. C. Standage, Don H. Madison, Kathrin D. Winkler, Igor BrayAbstract:Inelastic and superelastic electron scattering from the optically prepared $^{2}3P_{3/2}$ state of sodium has enabled atomic Collision Parameters to be deduced for the $4S\ensuremath{-}3P$ deexcitation and the $3S\ensuremath{-}3P$ excitation processes. These data are compared with convergent close coupling and second order distorted wave Born calculations. For excitation, both theories agree with experiment, whereas for deexcitation the close coupling theory is in better agreement. A long-standing proposal relating to the sign of the transferred angular momentum is not supported.
Eite Tiesinga - One of the best experts on this subject based on the ideXlab platform.
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precise determination of 6li cold Collision Parameters by radio frequency spectroscopy on weakly bound molecules
Physical Review Letters, 2005Co-Authors: M Bartenstein, A Altmeyer, Stefan J Riedl, R Geursen, Selim Jochim, Cheng Chin, Hecker J Denschlag, R Grimm, Andrea Simoni, Eite TiesingaAbstract:We employ radio-frequency spectroscopy on weakly bound (6)Li(2) molecules to precisely determine the molecular binding energies and the energy splittings between molecular states for different magnetic fields. These measurements allow us to extract the interaction Parameters of ultracold (6)Li atoms based on a multichannel quantum scattering model. We determine the singlet and triplet scattering lengths to be a(s) = 45.167(8)a(0) and a(t) = -2140(18)a(0) (1a(0) = 0.052 917 7 nm), and the positions of the broad Feshbach resonances in the energetically lowest three s-wave scattering channels to be 83.41(15), 69.04(5), and 81.12(10) mT.
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Precise determination of 6Li cold Collision Parameters by radio-frequency spectroscopy on weakly bound molecules.
Physical review letters, 2005Co-Authors: M Bartenstein, A Altmeyer, Stefan J Riedl, R Geursen, Selim Jochim, Cheng Chin, R Grimm, Andrea Simoni, J. Hecker Denschlag, Eite TiesingaAbstract:We employ radio-frequency spectroscopy on weakly bound $^{6}\mathrm{Li}_{2}$ molecules to precisely determine the molecular binding energies and the energy splittings between molecular states for different magnetic fields. These measurements allow us to extract the interaction Parameters of ultracold $^{6}\mathrm{Li}$ atoms based on a multichannel quantum scattering model. We determine the singlet and triplet scattering lengths to be ${a}_{s}=45.167(8){a}_{0}$ and ${a}_{t}=\ensuremath{-}2140(18){a}_{0}$ ($1{a}_{0}=0.052\text{ }917\text{ }7\text{ }\text{ }\mathrm{nm}$), and the positions of the broad Feshbach resonances in the energetically lowest three $s$-wave scattering channels to be 83.41(15), 69.04(5), and 81.12(10) mT.
M Bartenstein - One of the best experts on this subject based on the ideXlab platform.
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precise determination of 6li cold Collision Parameters by radio frequency spectroscopy on weakly bound molecules
Physical Review Letters, 2005Co-Authors: M Bartenstein, A Altmeyer, Stefan J Riedl, R Geursen, Selim Jochim, Cheng Chin, Hecker J Denschlag, R Grimm, Andrea Simoni, Eite TiesingaAbstract:We employ radio-frequency spectroscopy on weakly bound (6)Li(2) molecules to precisely determine the molecular binding energies and the energy splittings between molecular states for different magnetic fields. These measurements allow us to extract the interaction Parameters of ultracold (6)Li atoms based on a multichannel quantum scattering model. We determine the singlet and triplet scattering lengths to be a(s) = 45.167(8)a(0) and a(t) = -2140(18)a(0) (1a(0) = 0.052 917 7 nm), and the positions of the broad Feshbach resonances in the energetically lowest three s-wave scattering channels to be 83.41(15), 69.04(5), and 81.12(10) mT.
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Precise determination of 6Li cold Collision Parameters by radio-frequency spectroscopy on weakly bound molecules.
Physical review letters, 2005Co-Authors: M Bartenstein, A Altmeyer, Stefan J Riedl, R Geursen, Selim Jochim, Cheng Chin, R Grimm, Andrea Simoni, J. Hecker Denschlag, Eite TiesingaAbstract:We employ radio-frequency spectroscopy on weakly bound $^{6}\mathrm{Li}_{2}$ molecules to precisely determine the molecular binding energies and the energy splittings between molecular states for different magnetic fields. These measurements allow us to extract the interaction Parameters of ultracold $^{6}\mathrm{Li}$ atoms based on a multichannel quantum scattering model. We determine the singlet and triplet scattering lengths to be ${a}_{s}=45.167(8){a}_{0}$ and ${a}_{t}=\ensuremath{-}2140(18){a}_{0}$ ($1{a}_{0}=0.052\text{ }917\text{ }7\text{ }\text{ }\mathrm{nm}$), and the positions of the broad Feshbach resonances in the energetically lowest three $s$-wave scattering channels to be 83.41(15), 69.04(5), and 81.12(10) mT.
Alex Knight-percival - One of the best experts on this subject based on the ideXlab platform.
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Super-elastic electron scattering from the laser-excited 41P1 state of calcium at low incident energy
Journal of Physics B: Atomic Molecular and Optical Physics, 2011Co-Authors: Alex Knight-percival, Martyn Hussey, Sarah Jhumka, Andrew James MurrayAbstract:Atomic Collision Parameters have been measured for electron impact excitation of calcium using the superelastic scattering method, at incident electron energies equivalent to ~10eV and ~12eV. The Parameters P lin, L ⊥ and γ were derived for the 4 1 P 1 state, and the related Stokes Parameters determined. The results are compared to previously published calculations from four different theories: a relativistic distorted wave calculation, an R-matrix calculation, an R-matrix theory using B-splines, and a Convergent Close Coupling theory.
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Super-elastic electron scattering from calcium over all angles
Journal of Physics: Conference Series, 2009Co-Authors: William R Macgillivray, Andrew James Murray, Martyn Hussey, G C King, Alex Knight-percival, Sher SattiAbstract:Experimental results are reported for the Atomic Collision Parameters of calcium over all scattering angles as derived from super-elastic scattering experiments performed using a new Magnetic Angle Changing (MAC) spectrometer. Results at 55eV incident energy are compared to theoretical calculations, and new data at 65eV are reported here for the first time.
Martyn Hussey - One of the best experts on this subject based on the ideXlab platform.
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Super-elastic electron scattering from the laser-excited 41P1 state of calcium at low incident energy
Journal of Physics B: Atomic Molecular and Optical Physics, 2011Co-Authors: Alex Knight-percival, Martyn Hussey, Sarah Jhumka, Andrew James MurrayAbstract:Atomic Collision Parameters have been measured for electron impact excitation of calcium using the superelastic scattering method, at incident electron energies equivalent to ~10eV and ~12eV. The Parameters P lin, L ⊥ and γ were derived for the 4 1 P 1 state, and the related Stokes Parameters determined. The results are compared to previously published calculations from four different theories: a relativistic distorted wave calculation, an R-matrix calculation, an R-matrix theory using B-splines, and a Convergent Close Coupling theory.
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Super-elastic electron scattering from calcium over all angles
Journal of Physics: Conference Series, 2009Co-Authors: William R Macgillivray, Andrew James Murray, Martyn Hussey, G C King, Alex Knight-percival, Sher SattiAbstract:Experimental results are reported for the Atomic Collision Parameters of calcium over all scattering angles as derived from super-elastic scattering experiments performed using a new Magnetic Angle Changing (MAC) spectrometer. Results at 55eV incident energy are compared to theoretical calculations, and new data at 65eV are reported here for the first time.