The Experts below are selected from a list of 38292 Experts worldwide ranked by ideXlab platform
M Richter - One of the best experts on this subject based on the ideXlab platform.
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molecular structure retrieval directly from Laboratory Frame photoelectron spectra in laser induced electron diffraction
Nature Communications, 2021Co-Authors: Aurelien Sanchez, K Amini, Suju Wang, Tobias Steinle, Blanca Belsa, J Danek, X Liu, R Moshammer, Thomas Pfeifer, M RichterAbstract:Ubiquitous to most molecular scattering methods is the challenge to retrieve bond distance and angle from the scattering signals since this requires convergence of pattern matching algorithms or fitting methods. This problem is typically exacerbated when imaging larger molecules or for dynamic systems with little a priori knowledge. Here, we employ laser-induced electron diffraction (LIED) which is a powerful means to determine the precise atomic configuration of an isolated gas-phase molecule with picometre spatial and attosecond temporal precision. We introduce a simple molecular retrieval method, which is based only on the identification of critical points in the oscillating molecular interference scattering signal that is extracted directly from the Laboratory-Frame photoelectron spectrum. The method is compared with a Fourier-based retrieval method, and we show that both methods correctly retrieve the asymmetrically stretched and bent field-dressed configuration of the asymmetric top molecule carbonyl sulfide (OCS), which is confirmed by our quantum-classical calculations.
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molecular structure retrieval directly from Laboratory Frame photoelectron spectra in laser induced electron diffraction
Nature Communications, 2021Co-Authors: Aurelien Sanchez, K Amini, Suju Wang, Tobias Steinle, Blanca Belsa, J Danek, X Liu, R Moshammer, Thomas Pfeifer, M RichterAbstract:Ubiquitous to most molecular scattering methods is the challenge to retrieve bond distance and angle from the scattering signals since this requires convergence of pattern matching algorithms or fitting methods. This problem is typically exacerbated when imaging larger molecules or for dynamic systems with little a priori knowledge. Here, we employ laser-induced electron diffraction (LIED) which is a powerful means to determine the precise atomic configuration of an isolated gas-phase molecule with picometre spatial and attosecond temporal precision. We introduce a simple molecular retrieval method, which is based only on the identification of critical points in the oscillating molecular interference scattering signal that is extracted directly from the Laboratory-Frame photoelectron spectrum. The method is compared with a Fourier-based retrieval method, and we show that both methods correctly retrieve the asymmetrically stretched and bent field-dressed configuration of the asymmetric top molecule carbonyl sulfide (OCS), which is confirmed by our quantum-classical calculations. Optical methods utilizing ultrashort laser pulses are commonly used to probe structure and dynamics of atoms and molecules. Here the authors report a method which uses critical points and is capable of extracting molecular structure with picometer spatial and attosecond temporal resolution.
Ahmad Shakeel - One of the best experts on this subject based on the ideXlab platform.
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Z-boson production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
'Springer Science and Business Media LLC', 2020Co-Authors: Acharya Shreyasi, Adamova Dagmar, Adler Alexander, Adolfsson Jonatan, Aggarwal, Madan Mohan, Aglieri Rinella Gianluca, Agnello Michelangelo, Agrawal Neelima, Ahammed Zubayer, Ahmad ShakeelAbstract:Measurement of Z-boson production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV is reported. It is performed in the dimuon decay channel, through the detection of muons with pseudorapidity $-4 20$ GeV/$c$ in the Laboratory Frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass $60 20 GeV/c in the Laboratory Frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass 60 20$ GeV/$c$ in the Laboratory Frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass $60 < m^{\mu\mu} < 120$ GeV$c^2$ and rapidity $2.5 < y_{cms}^{\mu\mu} < 4$. They are presented as a function of rapidity and, for the Pb-Pb collisions, of centrality as well. The results are compared with theoretical calculations, both with and without nuclear modifications to the Parton Distribution Functions (PDFs). In p-Pb collisions the center-of-mass Frame is boosted with respect to the Laboratory Frame, and the measurements cover the backward ($-4.46< y_{cms}^{\mu\mu}
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Z-boson production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
'Springer Science and Business Media LLC', 2020Co-Authors: Acharya Shreyasi, Adamova Dagmar, Adler Alexander, Adolfsson Jonatan, Aggarwal, Madan Mohan, Aglieri Rinella Gianluca, Agnello Michelangelo, Agrawal Neelima, Ahammed Zubayer, Ahmad ShakeelAbstract:International audienceMeasurement of Z-boson production in p-Pb collisions at $ \sqrt{s_{\mathrm{NN}}} $ = 8.16 TeV and Pb-Pb collisions at $ \sqrt{s_{\mathrm{NN}}} $ = 5.02 TeV is reported. It is performed in the dimuon decay channel, through the detection of muons with pseudorapidity −4 20 GeV/c in the Laboratory Frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass 60 < m$_{μμ}$< 120 GeV/c$^{2}$ and rapidity 2.5
Jun Ichi Kamoshita - One of the best experts on this subject based on the ideXlab platform.
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probing noncommutative space time in the Laboratory Frame
European Physical Journal C, 2007Co-Authors: Jun Ichi KamoshitaAbstract:The phenomenological investigation of noncommutative space-time in the Laboratory Frame is presented. We formulate the apparent time variation of noncommutativity parameter θμν in the Laboratory Frame due to the earth’s rotation. Furthermore, in the noncommutative QED, we discuss how to probe the electric-like component θ E =(θ01,θ02,θ03) by the process $e^-e^+\rightarrow\gamma\gamma$ at future e-e+ linear collider. We may determine the magnitude and the direction of θ E by detailed study of the apparent time variation of the total cross-section. If no signal is observed, the upper limit on the magnitude of θ E can be determined independent of its direction.
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probing noncommutative space time in the Laboratory Frame
arXiv: High Energy Physics - Phenomenology, 2002Co-Authors: Jun Ichi KamoshitaAbstract:The phenomenological investigation of noncommutative space-time in the Laboratory Frame are presented. We formulate the apparent time variation of noncommutativity parameter $\theta_{\mu\nu}$ in the Laboratory Frame due to the earth's rotation. Furthermore, in the noncommutative QED, we discuss how to probe the electric-like component $\overrightarrow{\theta_{E}}=(\theta_{01},\theta_{02},\theta_{03})$ by the process $e^-e^+\to\gamma\gamma$ at future $e^-e^+$ linear collider. We may determine the magnitude and the direction of $\overrightarrow{\theta_{E}}$ by detailed study of the apparent time variation of total cross section. In case of us observing no signal, the upper limit on the magnitude of $\overrightarrow{\theta_E^{}}$ can be determined independently of its direction.
G Rajasekaran - One of the best experts on this subject based on the ideXlab platform.
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tev scale implications of non commutative space time in Laboratory Frame with polarized beams
Journal of High Energy Physics, 2011Co-Authors: Sumit K Garg, T Shreecharan, P K Das, Ng G Deshpande, G RajasekaranAbstract:We analyze e(+)e(-) -> gamma gamma, e(-)gamma -> e(-)gamma and gamma gamma -> e(+)e(-) processes within the Seiberg-Witten expanded noncommutative scenario using polarized beams. With unpolarized beams the leading order effects of non commutativity starts from second order in non commutative(NC) parameter i.e. O(Theta(2)), while with polarized beams these corrections appear at first order (O(Theta')) in cross section. The corrections in Compton case can probe the magnetic component(Theta(B)) while in Pair production and Pair annihilation probe the electric component((Theta) over right arrow (E)) of NC parameter. We include the effects of earth rotation in our analysis. This study is done by investigating the effects of non commutativity on different time averaged cross section observables. The results which also depends on the position of the collider, can provide clear and distinct signatures of the model testable at the International Linear Collider(ILC).
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tev scale implications of non commutative space time in Laboratory Frame with polarized beams
arXiv: High Energy Physics - Phenomenology, 2011Co-Authors: Sumit K Garg, T Shreecharan, P K Das, Ng G Deshpande, G RajasekaranAbstract:We analyze $e^{+}e^{-}\rightarrow \gamma\gamma$, $e^{-}\gamma \rightarrow e^{-}\gamma$ and $\gamma\gamma \rightarrow e^{+}e^{-} $ processes within the Seiberg-Witten expanded noncommutative scenario using polarized beams. With unpolarized beams the leading order effects of non commutativity starts from second order in non commutative(NC) parameter i.e. $O(\Theta^2)$, while with polarized beams these corrections appear at first order ($O(\Theta)$) in cross section. The corrections in Compton case can probe the magnetic component($\vec{\Theta}_B$) while in Pair production and Pair annihilation probe the electric component($\vec{\Theta}_E$) of NC parameter. We include the effects of earth rotation in our analysis. This study is done by investigating the effects of non commutativity on different time averaged cross section observables. The results which also depends on the position of the collider, can provide clear and distinct signatures of the model testable at the International Linear Collider(ILC).
Aurelien Sanchez - One of the best experts on this subject based on the ideXlab platform.
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molecular structure retrieval directly from Laboratory Frame photoelectron spectra in laser induced electron diffraction
Nature Communications, 2021Co-Authors: Aurelien Sanchez, K Amini, Suju Wang, Tobias Steinle, Blanca Belsa, J Danek, X Liu, R Moshammer, Thomas Pfeifer, M RichterAbstract:Ubiquitous to most molecular scattering methods is the challenge to retrieve bond distance and angle from the scattering signals since this requires convergence of pattern matching algorithms or fitting methods. This problem is typically exacerbated when imaging larger molecules or for dynamic systems with little a priori knowledge. Here, we employ laser-induced electron diffraction (LIED) which is a powerful means to determine the precise atomic configuration of an isolated gas-phase molecule with picometre spatial and attosecond temporal precision. We introduce a simple molecular retrieval method, which is based only on the identification of critical points in the oscillating molecular interference scattering signal that is extracted directly from the Laboratory-Frame photoelectron spectrum. The method is compared with a Fourier-based retrieval method, and we show that both methods correctly retrieve the asymmetrically stretched and bent field-dressed configuration of the asymmetric top molecule carbonyl sulfide (OCS), which is confirmed by our quantum-classical calculations.
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molecular structure retrieval directly from Laboratory Frame photoelectron spectra in laser induced electron diffraction
Nature Communications, 2021Co-Authors: Aurelien Sanchez, K Amini, Suju Wang, Tobias Steinle, Blanca Belsa, J Danek, X Liu, R Moshammer, Thomas Pfeifer, M RichterAbstract:Ubiquitous to most molecular scattering methods is the challenge to retrieve bond distance and angle from the scattering signals since this requires convergence of pattern matching algorithms or fitting methods. This problem is typically exacerbated when imaging larger molecules or for dynamic systems with little a priori knowledge. Here, we employ laser-induced electron diffraction (LIED) which is a powerful means to determine the precise atomic configuration of an isolated gas-phase molecule with picometre spatial and attosecond temporal precision. We introduce a simple molecular retrieval method, which is based only on the identification of critical points in the oscillating molecular interference scattering signal that is extracted directly from the Laboratory-Frame photoelectron spectrum. The method is compared with a Fourier-based retrieval method, and we show that both methods correctly retrieve the asymmetrically stretched and bent field-dressed configuration of the asymmetric top molecule carbonyl sulfide (OCS), which is confirmed by our quantum-classical calculations. Optical methods utilizing ultrashort laser pulses are commonly used to probe structure and dynamics of atoms and molecules. Here the authors report a method which uses critical points and is capable of extracting molecular structure with picometer spatial and attosecond temporal resolution.
