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  • Quantum optics, physics of lasers, nonlinear optics, classical optics  (4)
  • Molecular motion  (3)
  • Atomic, Molecular, and Optical Physics  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    Carbon-13 NMR relaxation studies of some dicyclohexyl compounds (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 777-785 
    Details
    ISSN: 0749-1581
    Schlagwort(e): Carbon-13 relaxation ; Molecular motion ; Rotational barriers ; Dicyclohexyl compounds ; Traction fluids ; Molecular modelling ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Four dicyclohexyl compounds were studied, one of which is a traction fluid and the remainder have related structures in which the cyclohexane rings are separated by two or three carbon atoms. Carbon-13 NMR T1 and NOE data were obtained for the four compounds at 22.50 and 100.62 MHz over a wide temperature range. The data were fitted simultaneously to either a reduced Lorentzian spectral density or to a ‘model-free’ two-correlation time spectral density. For the first time it has been possible to observe the tracking from the full ‘model-free’ two-correlation time spectral density to the reduced Lorentzian spectral density. From the correlation times and activation energies derived from these fittings, it can be concluded that all the compounds have semi-rigid structures. Computer modelling of the structures and molecular mechanics calculations of the rotational barriers gave results in agreement with those from the NMR data. Similarly, it was found that the friction coefficients of the compounds correlate with the NMR and molecular mechanics conclusions, namely that the increased rigidity produced by the introduction of methyl groups into the linkage between the cyclohexane rings leads to a more effective traction fluids. Hence it seems to be feasible to design new traction fluids in the laboratory.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260290807
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  • 2
    Digitale Medien
    Digitale Medien
    Multi-frequency, variable-temperature and high-pressure study of carbon-13 spin - lattice relaxation in tetraoctyltin (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 1221-1225 
    Details
    ISSN: 0749-1581
    Schlagwort(e): High pressure ; Molecular motion ; Carbon-13 relaxation ; Octyl chains ; Tetraoctyltin ; Polydecene ; Model lubricants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Carbon-13 NMR spin-lattice relaxation times, T1, and nuclear Overhauser effect data were obtained for neat tetra-n-octyltin at 22.5 and 100.6 MHz over a wide temperature range. T1 values were also measured at 25.16 MHz at pressures up to 211 MPa. The ambient-pressure data were fitted to the ‘model-free’ two-correlation time spectral density with a temperature-dependent order parameter, S2. The pressure data were interpreted by assuming that internal motions of the octyl chain are independent of pressure while the overall (tumbling) motion and S2 are pressure dependent. The values of the motional parameters for tetra-n-octyltin lie in the ranges expected for compounds containing long n-alkyl chains. The results show that this approach is applicable to complex liquids such as synthetic lubricants of the polydecene type.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260291211
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  • 3
    Digitale Medien
    Digitale Medien
    Carbon-13 NMR relaxation study of the overall and internal motions in compounds containing n-octyl chains (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 273-281 
    Details
    ISSN: 0749-1581
    Schlagwort(e): Molecular motion ; Carbon-13 relaxation ; Octyl chains ; Polydecene ; Model lubricants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The 13C nuclear relaxation behaviour of n-alkyl chains in a variety of compounds can be described in terms of two relaxation times, one for tumbling (τc) and one for each carbon nucleus for the internal motions (τc). Relaxation data for the quaternary carbon nuclei of n-octylbenzene and n-octyl cyanide have been used to determine τc) and their activation energies [Ea(τc)]. These values have enabled τe and their associated activation energies [Ea(τe)] to be calculated for each carbon in the alkyl chains of the two compounds. In these compounds the values for C-6 appear to be invariant with τe(298) = 15 ± 2 ps and Ea(τc) = 15 ± 1 kJ mol-1. Assuming that these are universal values for all n-octyl chains, we have used them to calculate τe and Ea(τe) for other simple n-octyl compounds, thus allowing τc and E.a(τc) to be determined. It was found that Ea(τc) values correlate well with those for Ea(n/T) obtained from viscosity measurements. Di-n-octyl ether shows motional properties similar to those of the straightchain compounds.Simultaneous fitting of relaxation rate and NOE enhancement data measured over a range of radiofrequencies and temperatures permits a wealth of motional properties to be discerned when there is a suitable frequency dispersion. Both tri-n-octylamine and polydecene tumble sufficiently slowly to allow both relaxation rate and NOE data to be used to evaluate τc and τe and their activation energies without making any assumptions about C-6. The values of τc(298) and Ea(τc) obtained from C-6 for tri-n-octylamine are 314 ± 12 ps and 18.5 ± 0.4 kJ mol-1, respectively, and the corresponding values for polydecene are 576 ± 41 ps and 16.1 ± 1.3 kJ mol-1, respectively.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260290314
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  • 4
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    Phonon-Mediated Nonclassical Interference in Diamond (2016)
    American Physical Society (APS)
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    Publikationsdatum: 2016-08-12
    Beschreibung: Author(s): Duncan G. England, Kent A. G. Fisher, Jean-Philippe W. MacLean, Philip J. Bustard, Khabat Heshami, Kevin J. Resch, and Benjamin J. Sussman Quantum interference of single photons is a fundamental aspect of many photonic quantum processing and communication protocols. Interference requires that the multiple pathways through an interferometer be temporally indistinguishable to within the coherence time of the photon. In this Letter, we us… [Phys. Rev. Lett. 117, 073603] Published Thu Aug 11, 2016
    Schlagwort(e): Atomic, Molecular, and Optical Physics
    Print ISSN: 0031-9007
    Digitale ISSN: 1079-7114
    Thema: Physik
    Publiziert von American Physical Society (APS)
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  • 5
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    Raman-induced slow-light delay of THz-bandwidth pulses (2016)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2016-04-08
    Beschreibung: Author(s): Philip J. Bustard, Khabat Heshami, Duncan G. England, Michael Spanner, and Benjamin J. Sussman We propose and experimentally demonstrate a scheme to generate optically controlled delays based on off-resonant Raman absorption. Dispersion in a transparency window between two neighboring, optically activated Raman absorption lines is used to reduce the group velocity of broadband 765 nm pulses. … [Phys. Rev. A 93, 043810] Published Wed Apr 06, 2016
    Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Digitale ISSN: 1094-1622
    Thema: Physik
    Publiziert von American Physical Society (APS)
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  • 6
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    Generation of frequency sidebands on single photons with indistinguishability from quantum dots (2018)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2018-07-11
    Beschreibung: Author(s): Uttam Paudel, Alexander P. Burgers, Duncan G. Steel, Michael K. Yakes, Allan S. Bracker, and Daniel Gammon Generation and manipulation of the quantum state of a single photon is at the heart of many quantum information protocols. There has been growing interest in using phase modulators as quantum optics devices that preserve coherence. In this Rapid Communication, we have used an electro-optic phase mod... [Phys. Rev. A 98, 011802(R)] Published Tue Jul 10, 2018
    Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Digitale ISSN: 1094-1622
    Thema: Physik
    Publiziert von American Physical Society (APS)
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  • 7
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    Time-bin-to-polarization conversion of ultrafast photonic qubits (2017)
    American Physical Society (APS)
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    Publikationsdatum: 2017-11-07
    Beschreibung: Author(s): Connor Kupchak, Philip J. Bustard, Khabat Heshami, Jennifer Erskine, Michael Spanner, Duncan G. England, and Benjamin J. Sussman The encoding of quantum information in photonic time-bin qubits is apt for long-distance quantum communication schemes. In practice, due to technical constraints such as detector response time, or the speed with which copolarized time-bins can be switched, other encodings, e.g., polarization, are of... [Phys. Rev. A 96, 053812] Published Mon Nov 06, 2017
    Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Digitale ISSN: 1094-1622
    Thema: Physik
    Publiziert von American Physical Society (APS)
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  • 8
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    Quantum frequency conversion with ultra-broadband tuning in a Raman memory (2017)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2017-05-06
    Beschreibung: Author(s): Philip J. Bustard, Duncan G. England, Khabat Heshami, Connor Kupchak, and Benjamin J. Sussman Quantum frequency conversion is a powerful tool for the construction of hybrid quantum photonic technologies. Raman quantum memories are a promising method of conversion due to their broad bandwidths. Here we demonstrate frequency conversion of THz-bandwidth, fs-duration photons at the single-photon… [Phys. Rev. A 95, 053816] Published Fri May 05, 2017
    Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Digitale ISSN: 1094-1622
    Thema: Physik
    Publiziert von American Physical Society (APS)
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  • 9
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    Storage and Retrieval of THz-Bandwidth Single Photons Using a Room-Temperature Diamond Quantum Memory (2015)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2015-02-06
    Beschreibung: Author(s): Duncan G. England, Kent A. G. Fisher, Jean-Philippe W. MacLean, Philip J. Bustard, Rune Lausten, Kevin J. Resch, and Benjamin J. Sussman Diamond crystals enable new ways of storing single photons at room temperature and detecting their entanglement. [Phys. Rev. Lett. 114, 053602] Published Thu Feb 05, 2015
    Schlagwort(e): Atomic, Molecular, and Optical Physics
    Print ISSN: 0031-9007
    Digitale ISSN: 1079-7114
    Thema: Physik
    Publiziert von American Physical Society (APS)
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