نتایج جستجو برای: photon fluence

تعداد نتایج: 74287  

Journal: :Physical review letters 2013
Enamul H Khan Marc H Weber Matthew D McCluskey

Positron annihilation spectra reveal isolated zinc vacancy (V(Zn)) creation in single-crystal ZnO exposed to 193-nm radiation at 100 mJ/cm(2) fluence. The appearance of a photoluminescence excitation peak at 3.18 eV in irradiated ZnO is attributed to an electronic transition from the V(Zn) acceptor level at ~100 meV to the conduction band. The observed V(Zn) density profile and hyperthermal Zn(...

Journal: :Physical review letters 2012
S P Hau-Riege A Graf T Döppner R A London J Krzywinski C Fortmann S H Glenzer M Frank K Sokolowski-Tinten M Messerschmidt C Bostedt S Schorb J A Bradley A Lutman D Rolles A Rudenko B Rudek

We used photon pulses from an x-ray free-electron laser to study ultrafast x-ray-induced transitions of graphite from solid to liquid and plasma states. This was accomplished by isochoric heating of graphite samples and simultaneous probing via Bragg and diffuse scattering at high time resolution. We observe that disintegration of the crystal lattice and ion heating of up to 5 eV occur within t...

Journal: :The journal of physical chemistry. B 2015
Sebastian R Beyer Lars Müller June Southall Richard J Cogdell G Matthias Ullmann Jürgen Köhler

We studied the time-resolved fluorescence of isolated RC-LH1 complexes from Rhodopseudomonas palustris as a function of the photon fluence and the repetition rate of the excitation laser. Both parameters were varied systematically over 3 orders of magnitude. On the basis of a microstate description we developed a quantitative model for RC-LH1 and obtained very good agreement between experiments...

Journal: :Science 2014
M Ackermann M Ajello K Asano W B Atwood M Axelsson L Baldini J Ballet G Barbiellini M G Baring D Bastieri K Bechtol R Bellazzini E Bissaldi E Bonamente J Bregeon M Brigida P Bruel R Buehler J Michael Burgess S Buson G A Caliandro R A Cameron P A Caraveo C Cecchi V Chaplin E Charles A Chekhtman C C Cheung J Chiang G Chiaro S Ciprini R Claus W Cleveland J Cohen-Tanugi A Collazzi L R Cominsky V Connaughton J Conrad S Cutini F D'Ammando A de Angelis M DeKlotz F de Palma C D Dermer R Desiante A Diekmann L Di Venere P S Drell A Drlica-Wagner C Favuzzi S J Fegan E C Ferrara J Finke G Fitzpatrick W B Focke A Franckowiak Y Fukazawa S Funk P Fusco F Gargano N Gehrels S Germani M Gibby N Giglietto M Giles F Giordano M Giroletti G Godfrey J Granot I A Grenier J E Grove D Gruber S Guiriec D Hadasch Y Hanabata A K Harding M Hayashida E Hays D Horan R E Hughes Y Inoue T Jogler G Jóhannesson W N Johnson T Kawano J Knödlseder D Kocevski M Kuss J Lande S Larsson L Latronico F Longo F Loparco M N Lovellette P Lubrano M Mayer M N Mazziotta J E McEnery P F Michelson T Mizuno A A Moiseev M E Monzani E Moretti A Morselli I V Moskalenko S Murgia R Nemmen E Nuss M Ohno T Ohsugi A Okumura N Omodei M Orienti D Paneque V Pelassa J S Perkins M Pesce-Rollins V Petrosian F Piron G Pivato T A Porter J L Racusin S Rainò R Rando M Razzano S Razzaque A Reimer O Reimer S Ritz M Roth F Ryde A Sartori P M Saz Parkinson J D Scargle A Schulz C Sgrò E J Siskind E Sonbas G Spandre P Spinelli H Tajima H Takahashi J G Thayer J B Thayer D J Thompson L Tibaldo M Tinivella D F Torres G Tosti E Troja T L Usher J Vandenbroucke V Vasileiou G Vianello V Vitale B L Winer K S Wood R Yamazaki G Younes H-F Yu S J Zhu P N Bhat M S Briggs D Byrne S Foley A Goldstein P Jenke R M Kippen C Kouveliotou S McBreen C Meegan W S Paciesas R Preece A Rau D Tierney A J van der Horst A von Kienlin C Wilson-Hodge S Xiong G Cusumano V La Parola J R Cummings

The observations of the exceptionally bright gamma-ray burst (GRB) 130427A by the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope provide constraints on the nature of these unique astrophysical sources. GRB 130427A had the largest fluence, highest-energy photon (95 GeV), longest γ-ray duration (20 hours), and one of the largest isotropic energy releases ever observed from a GRB....

Journal: :Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 2019

2018
S. Zhao G. Lioliou A. M. Barnett

A low-cost Commercial-Off-The-Shelf (COTS) 4H-SiC 0.06 mm2 UV p-n photodiode was coupled to a low-noise charge-sensitive preamplifier and used as photon counting X-ray spectrometer. The photodiode/spectrometer was investigated at X-ray energies from 4.95 keV to 21.17 keV: a Mo cathode X-ray tube was used to fluoresce eight high-purity metal foils to produce characteristic X-ray emission lines w...

Journal: :Physical chemistry chemical physics : PCCP 2017
Matías E Aguirre S Municoy M A Grela A J Colussi

The unique properties of semiconductor quantum dots (QDs) have found application in the conversion of solar to chemical energy. How the relative rates of the redox processes that control QD photon efficiencies depend on the particle radius (r) and photon energy (Eλ), however, is not fully understood. Here, we address these issues and report the quantum yields (Φs) of interfacial charge transfer...

Journal: :High Power Laser Science and Engineering 2022

Abstract We report on the design and characterization of plasma mirror system installed J-KAREN-P laser at Kansai Photon Science Institute, National Institutes for Quantum Technology. The reflectivity single exceeded 80%. In addition, temporal contrast was improved by two orders magnitude 1 ps before main pulse. Furthermore, near-field spatial distribution after kept constant fluence less than ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید