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Matthias Stein - One of the best experts on this subject based on the ideXlab platform.
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toward a molecular reorganization energy based analysis of third order nonlinear optical properties of polymethine dyes and j aggregates
Journal of Physical Chemistry A, 2019Co-Authors: Alexander Petrenko, Matthias SteinAbstract:This work demonstrates the feasibility and applicability of the theory of extended multiphonon Electron Transitions for the description of nonlinear optical properties of polymethine dyes using quantum chemistry and model calculations. The transformation of a strong one-photon absorption band in dye monomers to a weak two-photon absorption band is rationalized from the Electron-nuclear resonance condition. The power law fitting of the results of quantum chemical computations of nonlinear optical properties allows the predicting of the shift of the corresponding Egorov-like resonance curve to the shortest dye in the vinylogous series of dye monomers. The results presented provide an insight and guide for the rational molecular design and application of polymethine dyes.
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molecular reorganization energy as a key determinant of j band formation in j aggregates of polymethine dyes
Journal of Physical Chemistry A, 2015Co-Authors: Alexander Petrenko, Matthias SteinAbstract:This work demonstrates the feasibility of the theory of extended multiphonon Electron Transitions for the description of optical spectra of polymethine dyes and J-aggregates using quantum chemistry. The formation of a strong absorption band in dye monomers and a J-band in their aggregates is uniformly explained from the Electron-nuclear resonance condition. The redistribution of optical band intensities among cyanine dyes with the solvent is also explained. The dependence of the possibility of J-band formation in aggregates on the dye structure is successfully predicted. The results presented provide an insight for rational molecular design and application of polymethine dyes.
Wei Lin - One of the best experts on this subject based on the ideXlab platform.
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the very low energy solar flux of Electron and heavy flavor neutrinos and antineutrinos
Physics Letters B, 2000Co-Authors: W C Haxton, Wei LinAbstract:Abstract We calculate the thermal flux of low-energy solar neutrinos and antineutrinos of all flavors arising from a variety of neutrino pair processes: Compton production (including plasmon-pole diagrams), neutral current decay of thermally populated nuclear states, plasmon decay, and Electron Transitions from free to atomic bound states. The resulting flux density per flavor is significant (10 8 –10 9 /cm 2 /sec/MeV) below ∼ 5 keV, and the distributions fill much of the valley between the high-energy edge of the cosmic background neutrino spectrum and the low energy tails of the pp-chain Electron neutrino and terrestrial Electron antineutrino spectra. Thermal neutrinos carry information on the solar core temperature distribution and on heavy flavor neutrino masses for m ν μ or m ν τ ≳ 1 keV. The detection of these neutrinos is a daunting but interesting challenge.
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the very low energy solar flux of Electron and heavy flavor neutrinos and antineutrinos
arXiv: Nuclear Theory, 2000Co-Authors: W C Haxton, Wei LinAbstract:We calculate the thermal flux of low-energy solar neutrinos and antineutrinos of all flavors arising from a variety of neutrino pair processes: Compton production (including plasmon-pole diagrams), neutral current decay of thermally populated nuclear states, plasmon decay, and Electron Transitions from free to atomic bound states. The resulting flux density per flavor is significant (10E8-10E9/cm2/sec/MeV) below about 5 keV, and the distributions fill much of the valley between the high-energy edge of the cosmic background neutrino spectrum and the low energy tails of the pp-chain Electron neutrino and terrestrial Electron antineutrino spectra. Thermal neutrinos carry information on the solar core temperature distribution and on heavy flavor masses in the range of 1 keV. The detection of these neutrinos is a daunting but interesting challenge.
M Buuck - One of the best experts on this subject based on the ideXlab platform.
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search for pauli exclusion principle violating atomic Transitions and Electron decay with a p type point contact germanium detector
European Physical Journal C, 2016Co-Authors: N Abgrall, I J Arnquist, F T Avignone, A S Barabash, F E Bertrand, A W Bradley, V Brudanin, M Busch, M BuuckAbstract:A search for Pauli-exclusion-principle-violating Kα Electron Transitions was performed using 89.5 kg-d of data collected with a p-type point contact high-purity germanium detector operated at the Kimballton Underground Research Facility. A lower limit on the transition lifetime of 5.8×10^30 s at 90% C.L. was set by looking for a peak at 10.6 keV resulting from the X-ray and Auger Electrons present following the transition. A similar analysis was done to look for the decay of atomic K-shell Electrons into neutrinos, resulting in a lower limit of 6.8×10^30 s at 90% C.L. It is estimated that the Majorana Demonstrator, a 44 kg array of p-type point contact detectors that will search for the neutrinoless double-beta decay of 76Ge, could improve upon these exclusion limits by an order of magnitude after three years of operation.
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search for pauli exclusion principle violating atomic Transitions and Electron decay with a p type point contact germanium detector
arXiv: Nuclear Experiment, 2016Co-Authors: N Abgrall, I J Arnquist, F T Avignone, A S Barabash, F E Bertrand, A W Bradley, V Brudanin, M Busch, M BuuckAbstract:A search for Pauli-exclusion-principle-violating K-alpha Electron Transitions was performed using 89.5 kg-d of data collected with a p-type point contact high-purity germanium detector operated at the Kimballton Underground Research Facility. A lower limit on the transition lifetime of 5.8x10^30 seconds at 90% C.L. was set by looking for a peak at 10.6 keV resulting from the x-ray and Auger Electrons present following the transition. A similar analysis was done to look for the decay of atomic K-shell Electrons into neutrinos, resulting in a lower limit of 6.8x10^30 seconds at 90 C.L. It is estimated that the MAJORANA DEMONSTRATOR, a 44 kg array of p-type point contact detectors that will search for the neutrinoless double-beta decay of 76-Ge, could improve upon these exclusion limits by an order of magnitude after three years of operation.
F T Avignone - One of the best experts on this subject based on the ideXlab platform.
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search for pauli exclusion principle violating atomic Transitions and Electron decay with a p type point contact germanium detector
European Physical Journal C, 2016Co-Authors: N Abgrall, I J Arnquist, F T Avignone, A S Barabash, F E Bertrand, A W Bradley, V Brudanin, M Busch, M BuuckAbstract:A search for Pauli-exclusion-principle-violating Kα Electron Transitions was performed using 89.5 kg-d of data collected with a p-type point contact high-purity germanium detector operated at the Kimballton Underground Research Facility. A lower limit on the transition lifetime of 5.8×10^30 s at 90% C.L. was set by looking for a peak at 10.6 keV resulting from the X-ray and Auger Electrons present following the transition. A similar analysis was done to look for the decay of atomic K-shell Electrons into neutrinos, resulting in a lower limit of 6.8×10^30 s at 90% C.L. It is estimated that the Majorana Demonstrator, a 44 kg array of p-type point contact detectors that will search for the neutrinoless double-beta decay of 76Ge, could improve upon these exclusion limits by an order of magnitude after three years of operation.
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search for pauli exclusion principle violating atomic Transitions and Electron decay with a p type point contact germanium detector
arXiv: Nuclear Experiment, 2016Co-Authors: N Abgrall, I J Arnquist, F T Avignone, A S Barabash, F E Bertrand, A W Bradley, V Brudanin, M Busch, M BuuckAbstract:A search for Pauli-exclusion-principle-violating K-alpha Electron Transitions was performed using 89.5 kg-d of data collected with a p-type point contact high-purity germanium detector operated at the Kimballton Underground Research Facility. A lower limit on the transition lifetime of 5.8x10^30 seconds at 90% C.L. was set by looking for a peak at 10.6 keV resulting from the x-ray and Auger Electrons present following the transition. A similar analysis was done to look for the decay of atomic K-shell Electrons into neutrinos, resulting in a lower limit of 6.8x10^30 seconds at 90 C.L. It is estimated that the MAJORANA DEMONSTRATOR, a 44 kg array of p-type point contact detectors that will search for the neutrinoless double-beta decay of 76-Ge, could improve upon these exclusion limits by an order of magnitude after three years of operation.
Alexander Petrenko - One of the best experts on this subject based on the ideXlab platform.
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toward a molecular reorganization energy based analysis of third order nonlinear optical properties of polymethine dyes and j aggregates
Journal of Physical Chemistry A, 2019Co-Authors: Alexander Petrenko, Matthias SteinAbstract:This work demonstrates the feasibility and applicability of the theory of extended multiphonon Electron Transitions for the description of nonlinear optical properties of polymethine dyes using quantum chemistry and model calculations. The transformation of a strong one-photon absorption band in dye monomers to a weak two-photon absorption band is rationalized from the Electron-nuclear resonance condition. The power law fitting of the results of quantum chemical computations of nonlinear optical properties allows the predicting of the shift of the corresponding Egorov-like resonance curve to the shortest dye in the vinylogous series of dye monomers. The results presented provide an insight and guide for the rational molecular design and application of polymethine dyes.
-
molecular reorganization energy as a key determinant of j band formation in j aggregates of polymethine dyes
Journal of Physical Chemistry A, 2015Co-Authors: Alexander Petrenko, Matthias SteinAbstract:This work demonstrates the feasibility of the theory of extended multiphonon Electron Transitions for the description of optical spectra of polymethine dyes and J-aggregates using quantum chemistry. The formation of a strong absorption band in dye monomers and a J-band in their aggregates is uniformly explained from the Electron-nuclear resonance condition. The redistribution of optical band intensities among cyanine dyes with the solvent is also explained. The dependence of the possibility of J-band formation in aggregates on the dye structure is successfully predicted. The results presented provide an insight for rational molecular design and application of polymethine dyes.