Search results for: M. Krzystyniak

Items from 1 to 17 out of 17 results

article

Neutron total cross-section of hydrogenous and deuterated 1- and 2-propanol and n-butanol measured using the VESUVIO spectrometer

L.A. Rodríguez Palomino, J. Dawidowski, J.I. Márquez Damián, G.J. Cuello, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2017 > 870 > C > 84-89

This work presents the total cross sections of a set of normal and deuterated alcohols (hydrogenous 1 - and 2 -propanol and n-butanol, 1 -propanol(OD) and fully deuterated 2 -propanol and n-butanol), measured at spectrometer VESUVIO (ISIS spallation neutron source, United Kingdom). Granada’s Synthetic Model was applied to describe those systems and a satisfactory agreement with the measured total...

article

Temperature dependence of the kinetic energy in the Zr₄₀Be₆₀ amorphous alloy

G. F. Syrykh, A. A. Stolyarov, M. Krzystyniak, G. Romanelli, more

JETP Letters > 2017 > 105 > 9 > 591-594

The average kinetic energy 〈E(T)〉 of the atomic nucleus for each element of the amorphous alloy Zr₄₀Be₆₀ in the temperature range 10–300 K has been measured for the first time using VESUVIO spectrometer (ISIS). The experimental values of 〈E(T)〉 have been compared to the partial ZrBe spectra refined by a recursion method based on the data obtained with thermal neutron scattering. The satisfactory agreement...

article

On the line-shape analysis of Compton profiles and its application to neutron scattering

G. Romanelli, M. Krzystyniak

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2016 > 819 > C > 84-88

Analytical properties of Compton profiles are used in order to simplify the analysis of neutron Compton scattering experiments. In particular, the possibility to fit the difference of Compton profiles is discussed as a way to greatly decrease the level of complexity of the data treatment, making the analysis easier, faster and more robust. In the context of the novel method proposed, two mathematical...

chapter

Attosecond Effects in Scattering of Neutrons and Electrons from Protons

C. A. Chatzidimitriou-Dreismann, T. Abdul-Redah, M. Krzystyniak, M. Vos

NATO Science Series II: Mathematics, Physics and Chemistry > Decoherence, Entanglement and Information Protection in Complex Quantum Systems > Proton Entanglement and Decoherence in Solids > 483-498

Application of the neutron Compton scattering (NCS) technique — which operates in the sub-femtosecond timescale — to various materials yields results which indicate the presence of short-lived quantum entanglement between protons and electrons, and reveals novel aspects of attosecond dynamics of chemical bonds, e.g., breaking of covalent C - H bonds. The following striking phenomenon has been revealed:...

chapter

Quantum Entanglement and Decoherence Due to Coupling of Protons to Electronic Environment

T. Abdul-Redah, M. Krzystyniak, C. A. Chatzidimitriou-Dreismann

NATO Science Series II: Mathematics, Physics and Chemistry > Decoherence, Entanglement and Information Protection in Complex Quantum Systems > Proton Entanglement and Decoherence in Solids > 469-482

In recent years many scattering experiments have been performed on hydrogen containing materials which showed a scattering behavior different from the expectation according to standard theories. These scattering anomalies are attributed to the existence of short lived protonic quantum entanglement (QE) and decoherence. It was suggested that also electronic degrees of freedom might be involved in the...

chapter

Schrödinger’s Cat States of Protons in Condensed Matter

M. Krzystyniak, T. Abdul-Redah, C. A. Chatzidimitriou-Dreismann, F. Fillaux, more

NATO Science Series II: Mathematics, Physics and Chemistry > Decoherence, Entanglement and Information Protection in Complex Quantum Systems > Proton Entanglement and Decoherence in Solids > 439-444

article

Translational and rotational mobility of methanol-d4 molecules in NaX and NaY zeolite cages: A deuteron NMR investigation

Z.T. Lalowicz, G. Stoch, A. Birczyński, M. Punkkinen, more

Solid State Nuclear Magnetic Resonance > 2012 > 45-46 > Complete > 66-74

Nuclear magnetic resonance (NMR) provides means to investigate molecular dynamics at every state of matter. Features characteristic for the gas phase, liquid-like layers and immobilized methanol-d ₄ molecules in NaX and NaY zeolites were observed in the temperature range from 300K down to 20K. The NMR spectra at low temperature are consistent with the model in which molecules are bonded at...

article

Molecular structure refinement by direct fitting of atomic coordinates to experimental ESR spectra

G.T.P. Charnock, M. Krzystyniak, Ilya Kuprov

Journal of Magnetic Resonance > 2012 > 216 > Complete > 62-68

An attempt is made to bypass spectral analysis and fit internal coordinates of radicals directly to experimental liquid- and solid-state electron spin resonance (ESR) spectra. We take advantage of the recently introduced large-scale spin dynamics simulation algorithms and of the fact that the accuracy of quantum mechanical calculations of ESR parameters has improved to the point of quantitative correctness...

article

Destination state screening of active spaces in spin dynamics simulations

M. Krzystyniak, Luke J. Edwards, Ilya Kuprov

Journal of Magnetic Resonance > 2011 > 210 > 2 > 228-232

We propose a novel avenue for state space reduction in time domain Liouville space spin dynamics simulations, using detectability as a selection criterion – only those states that evolve into or affect other detectable states are kept in the simulation. This basis reduction procedure (referred to as destination state screening) is formally exact and can be applied on top of the existing state space...

article

Efficient design of multituned transmission line NMR probes: The electrical engineering approach

J.A. Frydel, M. Krzystyniak, D. Pienkowski, M. Pietrzak, more

Solid State Nuclear Magnetic Resonance > 2011 > 39 > 3-4 > 72-80

Transmission line-based multi-channel solid state NMR probes have many advantages regarding the cost of construction, number of RF-channels, and achievable RF-power levels. Nevertheless, these probes are only rarely employed in solid state-NMR-labs, mainly owing to the difficult experimental determination of the necessary RF-parameters. Here, the efficient design of multi-channel solid state MAS-NMR...

article

Spinach – A software library for simulation of spin dynamics in large spin systems

H.J. Hogben, M. Krzystyniak, G.T.P. Charnock, P.J. Hore, more

Journal of Magnetic Resonance > 2011 > 208 > 2 > 179-194

We introduce a software library incorporating our recent research into efficient simulation algorithms for large spin systems. Liouville space simulations (including symmetry, relaxation and chemical kinetics) of most liquid-state NMR experiments on 40+ spin systems can now be performed without effort on a desktop workstation. Much progress has also been made with improving the efficiency of ESR,...

article

Dynamics of hydroxyl deuterons and bonded water molecules in NaDY(0.8) zeolite as studied by means of deuteron NMR spectroscopy and relaxation

Z.T. Lalowicz, G. Stoch, A. Birczyński, M. Punkkinen, more

Solid State Nuclear Magnetic Resonance > 2010 > 37 > 3-4 > 91-100

Deuteron spin–lattice relaxation and spectra were measured for NaDY (0.8) zeolite containing some heavy water. Two subsystems of deuterons with different mobility were disclosed at low temperatures with their respective relaxation rates differing by two orders of magnitude. Spectra exhibit different shapes related directly to a specific motional model. Hydroxyl deuterons perform incoherent tunneling...

article

Asymptotic properties of the scattering function in neutron Compton scattering, I: Constant scattering angle vs. constant momentum transfer scan

M. Krzystyniak, C.A. Chatzidimitriou-Dreismann

Physica B: Physics of Condensed Matter > 2008 > 403 > 19-20 > 3443-3451

The recent upsurge of interest in data treatment of neutron Compton scattering (NCS) experiments has been triggered by the observation of a striking anomaly of the scattering intensities from protons at high energy and momentum transfers. The anomalous NCS intensities are measured with an experimental setup where the neutron detectors are placed at fixed scattering angles. It was put forward that,...

article

Relevance of the electronic environment for the neutron scattering behavior of protons

T. Abdul-Redah, P.A. Georgiev, M. Krzystyniak, D.K. Ross, more

Physica B: Physics of Condensed Matter > 2006 > 385-386 > Part 1 > 57-59

A large number of neutron Compton scattering (NCS) experiments on hydrogen containing materials like liquid water, metal hydrogen systems and organic compounds has been reported on where a striking effect of a strong neutron proton scattering cross section shortfall has been found. This effect—which has been very recently confirmed using electron–proton Compton scattering on organic polymers—was attributed...

article

Short lived protonic quantum entanglement and coupling to the electronic environment in LaH2 and LaH3

T. Abdul-Redah, P. Georgiev, D.K. Ross, M. Krzystyniak, more

Journal of Alloys and Compounds > 2005 > 404-406 > Complete > 787-789

Very recently, a temperature dependent decrease of the protonic neutron scattering cross section σH in LiH using neutron Compton scattering (NCS) has been reported. The decrease of σH – which has been found in various materials using different experimental methods – is attributed to short-lived protonic quantum entanglement and it was suggested that the novel temperature dependence is due to the different...

article

Anomalous neutron Compton scattering cross section in zirconium hydride

T. Abdul-Redah, M. Krzystyniak, J. Mayers, C.A. Chatzidimitriou-Dreismann

Journal of Alloys and Compounds > 2005 > 404-406 > Complete > 790-793

In the last few years we observed a shortfall of intensity of neutrons scattered from protons in various materials including metal hydrogen systems using neutron Compton scattering (NCS) on the VESUVIO instrument (ISIS, UK). This anomaly has been attributed to the existence of short-lived quantum entangled states of protons in these materials. Here we report on results of very recent NCS measurements...

article

Anomalous pulse angle dependence of the single and double quantum echoes in a photoinduced spin-correlated coupled radical pair

M. Krzystyniak

Applied Magnetic Resonance > 2003 > 24 > 3-4 > 447-465

In this work the response of a spin-correlated coupled radical pair to the sequence flash-t-P _ζ-τ-P _2ζ-T is investigated. For the theoretical analysis, the density operator formalism is used. Analytical expressions are derived for the electron spin single (SQ ESE) and double-quantum echoes (DQ ESE) as a function of pulse flip angle and singlet-triplet mixing angle. To illustrate the theoretical results,...

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