Time-Dependent Pair Correlations in Liquid Lead

Brockhouse, B. N.; Pope, N. K.

doi:10.1103/physrevlett.3.259

Cited by 73 publications

(21 citation statements)

References 10 publications

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“…So e.g. in the experiment of Brockhouse and Pope (see [4] and also [5], p. 429, Fig. 3.86) in neutron scatteririg on liquid lead a negative mean value of the Correlation function for the crystal density fluctuation and t = 0 has been found indeed.…”

Section: Cql(k T ) = ( a -K ( O ) Ak(0) A I ( T ) A ? K ( T ) )mentioning

confidence: 88%

On the Nonstationary Processes in Exciton Systems

Hadžiselimović

Marinković²,

Tošić

1980

Physica Status Solidi (b)

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HADSISELMOVIC: (a), 31. M. MARINKOVI~ (b), and B. S. TOSIC: (c)I n consequence of the nonconservation of excitons, the excitation number operator as well as the exciton pair creation and annihilation operators are expressed as functions of time and of the corresponding stationary operators. The nonstationary pair correlation processes and the nonstationary excitation density fluctuation processes are analysed using the nonstationary operators. It is found that the nonstationary pair correlations are characterized by a specific kind of dissipation that is linearly proportional with time. In contradistinction to Stationary processes, the corresponding nonstationary ones, lead to elementary excitations having a double energy: E (nonstationary) = = 2E (stationary). It is shown that in contrast to exciton density fluctuations, pair correlations have a tendency of localization related to a lattice point. It is also shown that the exciton nonstatinwry pair correlations are in many respect similar to the density fluctuations that take place in the crystal due to a near slow neutron passage. Finally, a general method for the evaluation of the correlation function, applicable even in the case when the Green's function has a n-th order pole, is developed in the -4ppendix.A1s Folge der Nichtkonservativitat der Exzitonen, werden sowohl der Exzitonenzahloperator als such der Exzitonenpaar-Erzeugungs-und Vernichtungsoperator als Funktion der Zeit und der entsprechenden stationiiren Operatoren ausgedriickt. Die nichtstationaren Paarkorrelationsprozesse und die nichtstationaren Anregungsdichte-Fluktuationsprozesse werden mit den nichtstationaren Operatoren analysiert. Es wird gefunden, daB die nichtstationaren Paar-Korrelationen durch eine spezifische Dissipationsart charakterisiert sind, die linear proportional zur Zeit ist. Im Gegensatz zu stationaren Prozessen fuhren die entsprechenden nichtstationaren zu elementaren h e g u n g e n mit doppelter Energie: E (nichtstationar) = 2E (stationar). Es wird gezeigt, daB im Gegensatz zu den Exziton-Dichtefluktuationen die Paarkorrelationen eine Tendenz zur Lokalisierung beziiglich eines Gitterpunktes haben. Es wird ebenfalls gezeigt, daB die nichtstationiiren Exziton-Paar-Korrelationen in vieler Hinsicht den Dichtefluktuationen ahnlich sind, die im Kristall in der NLhe des Durchgangs langsamer Neutronen stattfinden. SchlieBlich wird eine allgemeine Nethode zur Berechnung der Korrelationsfunktion im dnhang entwickelt, die sogar fur den Fall, in dem die Greensche Funktion einen Pol n-ter Ordnung besitzt, anwendbar ist.

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Section: Cql(k T ) = ( a -K ( O ) Ak(0) A I ( T ) A ? K ( T ) )mentioning

confidence: 88%

On the Nonstationary Processes in Exciton Systems

Hadžiselimović

Marinković²,

Tošić

1980

Physica Status Solidi (b)

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“…Historically, liquid metals were among the first fluid systems whose microscopic dynamics was investigated by neutron scattering [83] as early as the first three-axes neutron spectrometer became available in 1950s [84]. References to the first neutron experiments are found in [51].…”

Section: The Importance Of Collective Excitations In Liquids the Casmentioning

confidence: 99%

Future applications of the high-flux thermal neutron spectroscopy: the ever-green case of collective excitations in liquid metals

Petrillo

Sacchetti

2021

Advances in Physics: X

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The European landscape of neutron sources for research applications is changing and the major European joint effort, the European Spallation Source (ESS) currently under construction in Lund (Sweden), is progressing. The high flux source ESS is designed to deliver slow neutrons with a longpulse time structure, a rather unique feature, with characteristics optimised to maximise the instrument performances and the experimental throughput. This is expected to result in unprecedented scientific capability over broad research areas. Major breakthroughs are likely to take place in the understanding of complex, strongly interacting and disordered systems, more specifically on their dynamical response. This will have an impact on the development of novel theories to cover some of the presently existing knowledge gaps and will prompt advanced applications of the investigated materials. Liquid metals are a prototypical example of complex systems extensively studied from the sixties on, now re-emerging as powerful functional materials for unconventional and broad spectrum applications. Research on liquid metal composites will benefit of the new experimental possibilities available at the ESS. We review the status of the experiments on liquid metals dynamics, focusing on a selected set of systems, and discuss the perspectives for cutting-edge experiments at the new sources.

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“…[70][71][72] A vast amount of EPR spectroscopic studies have elucidated lipid, steroid and fatty acid dynamics in model membranes exhibiting lateral diffusion [73][74][75][76] appearing among the principal physical phenomenon of jump diffusion first detected in pure water and lead. [77][78][79] Several statistical mechanic considerations regarding rotational reorientation using the solution of the angular diffusion equation [80][81][82] lead to practical mathematical relationships to discern between Brownian diffusion, free diffusion, and jump diffusion. 34,81,83 We observed two bound spectral fractions F i,j,k (B), namely b 1 and b 2 , for polymers C 6 S 32 and C 11 S 14 (Fig.…”

Section: Duality Principle Of Fatty Acid Immobilizationproposal Of Thmentioning

confidence: 99%

Tunable dynamic hydrophobic attachment of guest molecules in amphiphilic core–shell polymers

et al. 2016

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In this study, synthesis and dynamic properties of amphiphilic core-shell polymers are reported as monitored through their interaction with small amphiphilic molecules. Brush-like structures are formed with a hydrophobic core surrounded by a hydrophilic shell utilizing controlled radical addition-fragmentation chain transfer (RAFT) polymerization of macromonomers consisting of linear polyglycerol chains attached to alkylene methacrylate. Continuous wave electron paramagnetic resonance (CW EPR) spectroscopy is employed to study how the amphiphilic, paramagnetic spin probe 16-DSA (16-doxyl stearic acid) interacts with polymers of different alkylene chain lengths in their hydrophobic cores and different polyglycerol chain lengths in their hydrophilic shells. The spin probe exhibits dynamic hydrophobic attachment to the polymers and reveals an indirect, dynamics-based view of polymer effects such as temperature response, aggregation and ligand binding properties. Increasing the hydrophobic alkylene chain length in the polymers alters the physical properties of the core region significantly. A large set of controllable functional polymer properties can be adjusted by the degree of polymerization and alkylene spacer length. Partial aggregation of the polymers further modifies the binding properties. Applying dynamic light scattering (DLS), transmission electron microscopy (TEM) and molecular dynamic (MD) simulations, the complex dynamic behavior found with EPR spectroscopy was further complemented and verified

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Time-Dependent Pair Correlations in Liquid Lead

Cited by 73 publications

References 10 publications

On the Nonstationary Processes in Exciton Systems

On the Nonstationary Processes in Exciton Systems

Future applications of the high-flux thermal neutron spectroscopy: the ever-green case of collective excitations in liquid metals

Tunable dynamic hydrophobic attachment of guest molecules in amphiphilic core–shell polymers

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