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  1. Article ; Online: Quantum optics: Controlling the light.

    Adams, Bernhard W

    Nature

    2012  Volume 482, Issue 7384, Page(s) 169–170

    Language English
    Publishing date 2012-02-08
    Publishing country England
    Document type Comment ; News
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/482169a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 26: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)
    Zs.MG 9: Show issues
    Zs.MO 244: Show issues

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  2. Article ; Online: Simulation of a Compton-based detector for low-dose high-resolution time-of-flight positron emission tomography.

    Domurat-Sousa, Kepler / Poe, Cameron M / McDaniel, Maya S / Spieglan, Eric / Shida, Joao F / Angelico, Evan / Adams, Bernhard W / Riviere, Patrick J La / Frisch, Henry J / Squires, Allison H

    ArXiv

    2024  

    Abstract: Two major challenges in time-of-flight positron emission tomography (TOF-PET) are low spatial resolution and high radioactive dose to the patient, both of which result from limitations in detection technology rather than fundamental physics. A new type ... ...

    Abstract Two major challenges in time-of-flight positron emission tomography (TOF-PET) are low spatial resolution and high radioactive dose to the patient, both of which result from limitations in detection technology rather than fundamental physics. A new type of TOF-PET detector employing low-atomic number (low-Z) scintillation media and large-area, high-resolution photodetectors to record Compton scattering locations in the detector has been proposed as a promising alternative, but the minimum technical requirements for such a system have not yet been established. Here we present a simulation study evaluating the potential of a proposed low-Z detection medium, linear alkylbenzene (LAB) doped with a switchable molecular recorder, for next-generation TOF-PET detection. We developed a custom Monte Carlo simulation of full-body TOF-PET using the TOPAS Geant4 software package. By quantifying contributions and tradeoffs for energy, spatial, and timing resolution of the detector, we show that at reasonable combination of specifications, our likelihood-based identification of pairs of first interaction locations in the simulated detector identifies 87.1% of pairs with zero or negligible error, and correctly rejects 90% of all in-patient scatters. The same specifications give TOF-PET sensitivity of ~66.7% and PSF width 4.6 mm with clear contrast. A detector with these specifications provides a clear image of a brain phantom simulated at less than 1% of a standard radiotracer dose.
    Language English
    Publishing date 2024-01-03
    Publishing country United States
    Document type Preprint
    ISSN 2331-8422
    ISSN (online) 2331-8422
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: X-ray Transient Absorption Studies of Exciton Self-Trapping

    Turner, Nathan A. / Mance, Jason G. / Attenkofer, Klaus / Adams, Bernhard W. / Zhang, Xiaoyi / Dexheimer, Susan L.

    Journal of physical chemistry. 2021 Dec. 24, v. 126, no. 1 p.349-355

    2021  

    Abstract: We present optical pump/X-ray absorption probe studies to probe changes in electronic distribution and local structure upon formation of a self-trapped exciton. The experiments were carried out on the mixed-valence halide-bridged transition metal linear ... ...

    Abstract We present optical pump/X-ray absorption probe studies to probe changes in electronic distribution and local structure upon formation of a self-trapped exciton. The experiments were carried out on the mixed-valence halide-bridged transition metal linear chain charge density wave material [Pt(en₂)][Pt(en₂)Cl₂]·(ClO₄)₄. Photoinduced changes in the Pt LIII XANES spectrum were measured on a picosecond time scale following generation of excitons via optical excitation of the intervalence charge transfer transition. Ab initio FEFF9 modeling of the spectra and the associated angular momentum projected density of states was used to interpret the response. We find photoinduced changes reflecting electronic redistribution and local lattice distortions that correspond to strong localization of the self-trapped state.
    Keywords X-radiation ; X-ray absorption spectroscopy ; absorption ; electron transfer ; momentum
    Language English
    Dates of publication 2021-1224
    Size p. 349-355.
    Publishing place American Chemical Society
    Document type Article ; Online
    ISSN 1932-7455
    DOI 10.1021/acs.jpcc.1c07270
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Ultrafast X-ray measurements of the glass-like, high-frequency stiffness of aqueous solutions.

    Jiao, Yishuo / Adams, Bernhard / Rose-Petruck, Christoph

    Physical chemistry chemical physics : PCCP

    2017  Volume 19, Issue 31, Page(s) 21095–21100

    Abstract: The ultrafast dynamics of the domains surrounding solutes in aqueous solution were measured using laser-generating GHz phonons inside of 30 mM ferrocyanide solutions and the resulting molecular motions of the solutes and their hydrogen-bonded solvation ... ...

    Abstract The ultrafast dynamics of the domains surrounding solutes in aqueous solution were measured using laser-generating GHz phonons inside of 30 mM ferrocyanide solutions and the resulting molecular motions of the solutes and their hydrogen-bonded solvation shells were detected using ultrafast X-ray absorption spectroscopy (UXAS). The measurements of the phonon dynamics around the solutes showed that the domains had a glass-like stiffness on a timescale of tens of picoseconds.
    Language English
    Publishing date 2017-08-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c7cp02747h
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Book: Impulse für Bibliotheken

    Adams, Bernhard / Helal, Ahmed H.

    Festschrift für Bernhard Adams zum 65. Geburtstag

    (Veröffentlichungen der Universitätsbibliothek Essen ; 19)

    1995  

    Author's details hrsg. von Ahmed H. Helal
    Series title Veröffentlichungen der Universitätsbibliothek Essen ; 19
    Collection
    Keywords Information Storage and Retrieval / trends ; Libraries / trends ; Deutschland ; Bibliothek ; Adams, Bernhard
    Subject Bibliotheken ; Allgemeinbibliothek ; Bibliothekswesen ; Bücherei ; Universalbibliothek ; Gebrauchsbibliothek
    Language German
    Size X, 186 S. : Ill.
    Publisher Univ.-Bibliothek
    Publishing place Essen
    Document type Book
    Note Bibliogr. B. Adams S. 179 - 183
    HBZ-ID HT006772877
    ISBN 3-922602-20-7 ; 978-3-922602-20-0
    Database Catalogue ZB MED Nutrition, Environment, Agriculture

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    In stock of ZB MED Bonn / Germany

    Shelf markLoan statusLocation
    958/2398 available for loan (reading room) Freihandmagazin (U1)

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  6. Article ; Online: X-ray focusing scheme with continuously variable lens.

    Adams, Bernhard W / Rose-Petruck, Christoph

    Journal of synchrotron radiation

    2015  Volume 22, Issue 1, Page(s) 16–22

    Abstract: A novel hybrid X-ray focusing scheme was developed for operation of the X-ray streak camera at the Advanced Photon Source: an X-ray lens focuses vertically from a long distance of 16 m and produces an extended focus that has a small footprint on an ... ...

    Abstract A novel hybrid X-ray focusing scheme was developed for operation of the X-ray streak camera at the Advanced Photon Source: an X-ray lens focuses vertically from a long distance of 16 m and produces an extended focus that has a small footprint on an inexpensive sagittal mirror. A patented method is used to continuously adjust the focal length of the lens and compensate for chromatic dispersion in energy scans.
    Language English
    Publishing date 2015-01
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2021413-3
    ISSN 1600-5775 ; 0909-0495
    ISSN (online) 1600-5775
    ISSN 0909-0495
    DOI 10.1107/S1600577514020451
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Picosecond-resolved X-ray absorption spectroscopy at low signal contrast using a hard X-ray streak camera.

    Adams, Bernhard W / Rose-Petruck, Christoph / Jiao, Yishuo

    Journal of synchrotron radiation

    2015  Volume 22, Issue 4, Page(s) 1022–1029

    Abstract: A picosecond-resolving hard-X-ray streak camera has been in operation for several years at Sector 7 of the Advanced Photon Source (APS). Several upgrades have been implemented over the past few years to optimize integration into the beamline, reduce the ... ...

    Abstract A picosecond-resolving hard-X-ray streak camera has been in operation for several years at Sector 7 of the Advanced Photon Source (APS). Several upgrades have been implemented over the past few years to optimize integration into the beamline, reduce the timing jitter, and improve the signal-to-noise ratio. These include the development of X-ray optics for focusing the X-rays into the sample and the entrance slit of the streak camera, and measures to minimize the amount of laser light needed to generate the deflection-voltage ramp. For the latter, the photoconductive switch generating the deflection ramp was replaced with microwave power electronics. With these, the streak camera operates routinely at 88 MHz repetition rate, thus making it compatible with all of the APS fill patterns including use of all the X-rays in the 324-bunch mode. Sample data are shown to demonstrate the performance.
    Language English
    Publishing date 2015-07
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2021413-3
    ISSN 1600-5775 ; 0909-0495
    ISSN (online) 1600-5775
    ISSN 0909-0495
    DOI 10.1107/S1600577515007912
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Time-dependent Takagi-Taupin eikonal theory of X-ray diffraction in rapidly changing crystal structures.

    Adams, Bernhard W

    Acta crystallographica. Section A, Foundations of crystallography

    2004  Volume 60, Issue Pt 2, Page(s) 120–133

    Abstract: The Takagi-Taupin theory is extended by synthesizing it with the eikonal theory in a unified space-time approach based upon microscopic electromagnetism. The principal goal is the description of X-ray diffraction in a crystal undergoing subpicosecond and ...

    Abstract The Takagi-Taupin theory is extended by synthesizing it with the eikonal theory in a unified space-time approach based upon microscopic electromagnetism. The principal goal is the description of X-ray diffraction in a crystal undergoing subpicosecond and few-femtosecond changes.
    Language English
    Publishing date 2004-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2020844-3
    ISSN 2053-2733 ; 1600-5724 ; 0108-7673
    ISSN (online) 2053-2733 ; 1600-5724
    ISSN 0108-7673
    DOI 10.1107/S0108767303025881
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Book: Nonlinear optics, quantum optics, and ultrafast phenomena with X-rays

    Adams, Bernhard W

    physics with X-ray free-electron lasers

    2003  

    Author's details ed. by Bernhard W. Adams
    Keywords Free electron lasers ; Laser pulses, Ultrashort ; Nonlinear optics ; Quantum optics ; X-ray lasers
    Language English
    Size XXIII, 330 S., Ill., graph. Darst.
    Publisher Kluwer Acad. Publ
    Publishing place Boston u.a.
    Document type Book
    Note Literaturverz. S. 303 - 326
    Accompanying material 1 CD-ROM (12 cm)
    ISBN 1402074751 ; 9781402074752
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  10. Article: An active-optic x-ray fluorescence analyzer with high energy resolution, large solid angle coverage, and a large tuning range.

    Adams, Bernhard W / Attenkofer, Klaus

    The Review of scientific instruments

    2008  Volume 79, Issue 2 Pt 1, Page(s) 23102

    Abstract: A crystal-optic x-ray fluorescence energy analyzer has been designed and tested, which combines the features of electron-volt energy resolution, large solid angle coverage, and tunability over several kilo-electron-volts. The design is based upon the ... ...

    Abstract A crystal-optic x-ray fluorescence energy analyzer has been designed and tested, which combines the features of electron-volt energy resolution, large solid angle coverage, and tunability over several kilo-electron-volts. The design is based upon the principle of active optics, with ten actuators available to optimally adjust the shape of a silicon crystal used in the Bragg geometry. In most applications the shape is that of a logarithmic spiral for high energy resolution with a spatially nonresolving detector, but a wide range of other shapes is also possible for applications such as imaging or single-shot spectroscopy in a spectral range of the operator's choosing.
    Language English
    Publishing date 2008-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/1.2823527
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 46/112: Show issues

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