Results 31 to 40 of about 1,787,488 (253)

Identification of lead vacancy defects in lead halide perovskites

Nature Communications, 2021
Point defects compromise the electronic performance of hybrid perovskites, yet no experimental identifications have been reported. Here, the authors, for the first time, identify lead monovacancy defect in MAPbI3 using positron annihilation lifetime ...
David J. Keeble, Julia Wiktor, Sandeep K. Pathak, Laurie J. Phillips, Marcel Dickmann, Ken Durose, Henry J. Snaith, Werner Egger   +7 more
doaj   +1 more source

Precipitation processes in Al–Mg–Si extending down to initial clustering revealed by the complementary techniques of positron lifetime spectroscopy and dilatometry

Journal of Materials Science, 2018
The design of specific material properties of aluminum alloys demands for a detailed understanding of clustering and precipitation processes occurring during heat treatments.
L. Resch, G. Klinser, E. Hengge, R. Enzinger, M. Luckabauer, W. Sprengel, R. Würschum   +6 more
semanticscholar   +1 more source

A single shot gamma-induced positron spectroscopy based on laser wakefield accelerator

AIP Advances, 2021
Single shot gamma-induced positron annihilation spectroscopy (GiPS) based on a laser wakefield accelerator is proposed. In this spectroscopy, a large number of gamma rays generated by laser-wakefield accelerated electrons are injected into a sample in a ...
Yonghong Yan, Minghai Yu, Shaoyi Wang, Fang Tan, Yue Yang, Xiaohui Zhang, Yuchi Wu, Jingqin Su, Weimin Zhou, Yuqiu Gu   +9 more
doaj   +1 more source

Studies on healthy and neoplastic tissues using positron annihilation lifetime spectroscopy and focused histopathological imaging

Scientific Reports, 2020
Samples of healthy and neoplastic myometrial tissues were investigated using Positron Annihilation Lifetime Spectroscopy (PALS). Meaningful differences between normal and diseased tissues were observed for each patient.
B. Zgardzińska, G. Chołubek, Bożena Jarosz, K. Wysogląd, M. Gorgol, M. Goździuk, M. Chołubek, B. Jasińska   +7 more
semanticscholar   +1 more source

Systematics of positron lifetime spectroscopy measurements in ferroelectrics

Journal of Physics: Conference Series, 2020
Abstract In the paper is demonstrated the use of positron lifetime spectroscopy (PLS) in a comparative study of the results in ferroelectrics. The first part is devoted to the application of PLS as a probe for measurements of ferroelectrics.
Peneva, S, Troev, T, Kolev, B
openaire   +1 more source

Positron annihilation spectroscopy in polymers

, 2022
S.219-223During the last decades positron annihilation has become a very powerful tool for the investigation of polymers. In particular, positron annihilation lifetime spectroscopy (PALS) yields valuable information on free volume and other properties ...
Günther-Schade, K., Kögel, G., Kanzow, J., Sperr, P., Nagel, C., Faupel, F.   +5 more
core   +1 more source

Position-resolved Positron Annihilation Lifetime Spectroscopy [PDF]

Journal of Physics: Conference Series, 2013
A new method which allows for position-resolved positron lifetime spectroscopy studies in extended volume samples is presented. In addition to the existing technique of in-situ production of positrons inside large (cm3) bulk samples using high-energy photons up to 16 MeV from bremsstrahlung production, granular position-sensitive photon detectors have ...
Wagner, A., Butterling, M., Fiedler, F., Fritz, F., Kempe, M., Cowan, T. E.   +5 more
openaire   +1 more source

Positron beam lifetime spectroscopy at Lawrence Livermore National Laboratory [PDF]

, 1996
Defect analysis is needed for samples ranging in thickness from thin films to large engineering parts. We are meeting that need with two positron beam lifetime spectrometers: on on a 3 MeV electrostatic accelerator and the second on our high current ...
Thomas E. Cowan, Richard H. Howell, Jay H. Hartley, Philip A. Sterne, Hartley, J. H., Howell, R. H., Stern, P. A., Cowan, T. E.   +7 more
core   +1 more source

Characterization of imperfections in scintillator crystals using gamma-ray induced positron annihilation lifetime spectroscopy

Optical Materials: X, 2022
Gamma-ray-induced positron annihilation lifetime spectroscopy (GiPALS) was used to characterize pristine and codoped Lu3Al5O12 (LuAG) crystals grown using Czochralski (Cz) and micropulling-down (mPD) methods.
Mamoru Kitaura, Yoshitaka Taira, Shinta Watanabe   +2 more
doaj   +1 more source

DLTPulseGenerator: A library for the simulation of lifetime spectra based on detector-output pulses

SoftwareX, 2018
The quantitative analysis of lifetime spectra relevant in both life and materials sciences presents one of the ill-posed inverse problems and, hence, leads to most stringent requirements on the hardware specifications and the analysis algorithms. Here we
Danny Petschke, Torsten E.M. Staab
doaj   +1 more source