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Articoli di riviste sul tema "Photo-Dynamics"

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Autore: Grafiati

Pubblicato: 22 giugno 2024

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1

KRASILNIKOV, MIKHAIL. "BEAM DYNAMICS OPTIMIZATION FOR THE XFEL PHOTO INJECTOR". International Journal of Modern Physics A 24, n. 05 (20 febbraio 2009): 879–92. http://dx.doi.org/10.1142/s0217751x0904436x.

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The main challenge for the European XFEL photo injector is the production of 1 nC electron beams with a normalized transverse emittance of 0.9 mm mrad. The photo injector setup consists of a 1.5-cell L-band rf gun cavity supplied with solenoids for beam focusing and emittance compensation and the first accelerating section with 8 TESLA superconducting cavities. The first 4 cavities are used as a booster to provide by proper choice of its position, gradient and phase matching conditions for the emittance conservation. For optimization of the beam dynamics in the photo injector, a staged algorithm, based on ASTRA simulations, has been developed. The first stage considers the emission of electrons from a photo cathode. The cathode laser energy and its transverse parameters are adjusted to produce a bunch charge of 1 nC in presence of space charge forces (including image charge at the cathode) and Schottky-like effects. The second stage contains rf gun cavity and solenoid optimization. The booster position, gradient and initial phase are optimized at the third stage yielding the minimum emittance at the photo injector exit. Results of the XFEL photo injector optimization will be presented. Besides simulations experimental studies towards XFEL photo injector are carried out. The photo injector test facility at DESY in Zeuthen (PITZ) develops photo injectors for FELs, including FLASH and the European XFEL. A thorough comparison of measured data with results of beam dynamics simulations is one of the main PITZ goals. Detailed experimental studies on photo emission processes, thermal emittance, transverse and longitudinal phase space of the electron beam are being performed together with beam dynamics simulations. This aims to result in better understanding of beam dynamics in high brightness photo injectors. Experimentally obtained photo injector characteristics (like thermal emittance) have to be used in an additional optimization of the photo injector resulting in more realistic beam dynamics simulations. Results of these studies will be reported as well.

2

Gnodtke, Christian, Ulf Saalmann e Jan-Michael Rost. "Dynamics of photo-activated Coulomb complexes". New Journal of Physics 13, n. 1 (21 gennaio 2011): 013028. http://dx.doi.org/10.1088/1367-2630/13/1/013028.

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3

Kimura, Yoshifumi, Tsuyoshi Yamaguchi e Noboru Hirota. "Photo-excitation dynamics of Phenol Blue". Physical Chemistry Chemical Physics 2, n. 7 (2000): 1415–20. http://dx.doi.org/10.1039/a909485g.

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4

Masuhara, Hiroshi, Akira Itaya e Hiroshi Fukumura. "Photo-excitation dynamics of polymeric materials." Kobunshi 38, n. 8 (1989): 832–35. http://dx.doi.org/10.1295/kobunshi.38.832.

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5

Jacobson, Michele L., e Kathy L. Rowlen. "Photo-dynamics on thin silver films". Chemical Physics Letters 401, n. 1-3 (gennaio 2005): 52–57. http://dx.doi.org/10.1016/j.cplett.2004.11.018.

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6

Gratz, H., A. Penzkofer, C. Abels, R. M. Szeimies, M. Landthaler e W. Bäumler. "Photo-isomerisation, triplet formation, and photo-degradation dynamics of indocyanine green solutions". Journal of Photochemistry and Photobiology A: Chemistry 128, n. 1-3 (novembre 1999): 101–9. http://dx.doi.org/10.1016/s1010-6030(99)00174-4.

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7

Kumazoe, Hiroyuki, Aravind Krishnamoorthy, Lindsay Bassman, Fuyuki Shimojo, Rajiv K. Kalia, Aiichiro Nakano e Priya Vashishta. "Photo-induced Contraction of Layered Materials". MRS Advances 3, n. 6-7 (2018): 333–38. http://dx.doi.org/10.1557/adv.2018.127.

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ABSTRACTUltrafast atomic dynamics induced by electronic and optical excitation opens new possibilities for functionalization of two-dimensional and layered materials. Understanding the impact of perturbed valence band populations on both the strong covalent bonds and relatively weaker van der Waals interactions is important for these anisotropic systems. While the dynamics of strong covalent bonds has been explored both experimentally and theoretically, relatively fewer studies have focused on the impact of excitation on weak bonds like van der Waals and hydrogen-bond interactions. We perform non-adiabatic quantum molecular dynamics (NAQMD) simulations to study photo-induced dynamics in MoS2 bilayer. We observe photo-induced non-thermal contraction of the interlayer distance in the MoS2 bilayer within 100 femtoseconds after photoexcitation. We identify a large photo-induced redistribution of electronic charge density, whose Coulombic interactions could explain the observed inter-layer contraction.

8

Hashimoto, Hiroshi, Hiroaki Matsueda, Hitoshi Seo e Sumio Ishihara. "Photo-Induced Dynamics in Charge-Frustrated Systems". Journal of the Physical Society of Japan 83, n. 12 (15 dicembre 2014): 123703. http://dx.doi.org/10.7566/jpsj.83.123703.

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9

Miah, M. Idrish, e Lubna Naheed. "Photo-induced excitonic spin dynamics in GaAs". Optical and Quantum Electronics 47, n. 5 (13 agosto 2014): 1239–44. http://dx.doi.org/10.1007/s11082-014-9981-4.

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10

Asham, Mina D., Walid A. Zein e Adel H. Phillips. "Photo-Induced Spin Dynamics in Nanoelectronic Devices". Chinese Physics Letters 29, n. 10 (ottobre 2012): 108502. http://dx.doi.org/10.1088/0256-307x/29/10/108502.

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11

Ilnytskyi, J., A. Slyusarchuk e M. Saphiannikova. "Photo-controllable percolation of decorated nanoparticles in a nanopore: molecular dynamics simulation study". Mathematical Modeling and Computing 3, n. 1 (1 luglio 2016): 33–42. http://dx.doi.org/10.23939/mmc2016.01.033.

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12

ANIJA, M., SUNIL KUMAR, N. KAMARAJU, NEHA TIWARI, S. K. KULKARNI e A. K. SOOD. "ULTRAFAST DYNAMICS OF GOLD NANORODS: TUNING BETWEEN PHOTO-BLEACHING AND PHOTO-INDUCED ABSORPTION". International Journal of Nanoscience 10, n. 04n05 (agosto 2011): 687–91. http://dx.doi.org/10.1142/s0219581x11009179.

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We report ultrafast electron dynamics in gold nanorods investigated using 80 fs laser pulses centered at 1.57 eV. Five types of nanorod colloidal suspensions in water having their longitudinal surface plasmon peak (E LSP ) on either side of the laser photon energy (EL) have been studied. For E LSP > EL, photo-induced absorption with single decay time constant is observed. On the other hand, for E LSP < EL, photo-bleaching is observed having bi-exponential decay dynamics; the faster one between 1–3 ps and slower one between 7 ps to 22 ps both of them increasing almost linearly with the difference |EL – E LSP |. These time constants increase linearly with the pump intensity. Simulations have been carried out to understand the interplay between photo-bleaching and photo-induced absorption.

13

Takaishi, Shinya, e Masahiro Yamashita. "Solitons, polarons and their dynamics in mixed-valence halogen-bridged MX-chains". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 366, n. 1862 (7 settembre 2007): 93–100. http://dx.doi.org/10.1098/rsta.2007.2142.

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This article describes the photo-generation processes of elementary excitations such as solitons and polarons, and their dynamics in the one-dimensional (1D) halogen-bridged Pt compound [Pt(en) 2 Br](ClO 4 ) 2 . Spin-solitons were photo-generated via relaxation processes of CT excitons and self-trapped excitons, made evident by photo-induced absorption and photo-induced electron spin resonance spectra. Polarons were not generated from CT excitons. Diffusion of spin-solitons on the 1D chain was studied quantitatively by analysing 1 H NMR spin-lattice relaxation times ( T 1 ).

14

Ohnishi, Hiromasa, e Norikazu Tomita. "Two Topics of Optical Excitation Dynamics, Newly Unveiled by the Time- and Momentum-Resolved Photo-Electron Emission from the Conduction Band of GaAs: A Theoretical Review". Applied Sciences 8, n. 10 (1 ottobre 2018): 1788. http://dx.doi.org/10.3390/app8101788.

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We review the recent two topics of optical excitation and relaxation dynamics, newly unveiled by the time- and momentum-resolved photo-electron emission from the conduction band of GaAs. One is the real-time collective relaxation dynamics, resulting in the Fermi degeneracy formation in the Γ valley. We show that it takes almost infinite time to realize the exact Fermi degeneracy, due to a restricted selection rule for the intravalley transition of the photo-excited electrons. The other is the spontaneous and instantaneous intervalley transition from the Γ valley to the L one. By considering the electron-phonon coupling before the photo-excitation, such spontaneous intervalley transition is realized within the framework of the Franck–Condon principle of the photo-excitation.

15

Liu, Qianchen, Yutong Zhang, Qi Zhang, Qianshun Wei, Dexia Zhou, Guorong Wu, Kaicong Cai, Kaijun Yuan e Hongtao Bian. "Understanding the intramolecular vibrational energy transfer and structural dynamics of anionic ligands in a photo-catalytic CO2 reduction catalyst". Physical Chemistry Chemical Physics 21, n. 41 (2019): 23026–35. http://dx.doi.org/10.1039/c9cp05029a.

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The knowledge of intramolecular vibrational energy redistribution (IVR) and structural dynamics of rhenium photo-catalysts is essential for understanding the mechanism of the photo-catalytic process of CO₂ reduction.

16

YAWO, Hiromu, Saki TANIMOTO, Toru ISHIZUKA e Tetsuo TAKAHASHI. "Molecular Dynamics of Photo-electrical Transducing Proteins, Channelrhodopsins". Seibutsu Butsuri 52, n. 5 (2012): 226–29. http://dx.doi.org/10.2142/biophys.52.226.

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17

Gao, C.-Z., P. Wopperer, P. M. Dinh, E. Suraud e P.-G. Reinhard. "On the dynamics of photo-electrons in C60". Journal of Physics B: Atomic, Molecular and Optical Physics 48, n. 10 (14 aprile 2015): 105102. http://dx.doi.org/10.1088/0953-4075/48/10/105102.

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18

Leitner, T., F. Buchner, A. Luebcke, A. Rouzée, L. Rading, P. Johnsson, M. Odelius, H. O. Karlsson, M. Vrakking e Ph Wernet. "Coherent wave packet dynamics in photo-excited Nal". EPJ Web of Conferences 41 (2013): 02027. http://dx.doi.org/10.1051/epjconf/20134102027.

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19

Harper, P. G., e J. Pfab. "Fragmentation dynamics of the photo-dissociated triatomic molecule". Molecular Physics 78, n. 6 (20 aprile 1993): 1337–50. http://dx.doi.org/10.1080/00268979300100891.

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20

Werdehausen, Daniel, Tomohiro Takayama, Gelon Albrecht, Yangfan Lu, Hidenori Takagi e Stefan Kaiser. "Photo-excited dynamics in the excitonic insulator Ta2NiSe5". Journal of Physics: Condensed Matter 30, n. 30 (5 luglio 2018): 305602. http://dx.doi.org/10.1088/1361-648x/aacd76.

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21

Shimosako, Naoki, Yuta Inose, Kazuhiro Ema, Yusuke Igawa e Katsumi Kishino. "Photo-generated Carrier Dynamics of InGaN/GaN Nanocolumns". Physics Procedia 76 (2015): 42–46. http://dx.doi.org/10.1016/j.phpro.2015.10.008.

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22

Qian, Tingting, Mei Wang, Jiao Wang, Rongrong Zhu, Xiaolie He, Xiaoyu Sun, Dongmei Sun, Qingxiu Wang e ShiLong Wang. "Transient spectra study on photo-dynamics of curcumin". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 166 (settembre 2016): 38–43. http://dx.doi.org/10.1016/j.saa.2016.04.051.

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23

Hashimoto, Masafumi, Kazuya Fukunaga, Kazuaki Kouyama, Jumpei Kamimura, Hideyuki Kunugita, Kazuhiro Ema, Akihiko Kikuchi e Katsumi Kishino. "Photo-excited carrier relaxation dynamics in InN films". Journal of Physics: Conference Series 193 (1 novembre 2009): 012053. http://dx.doi.org/10.1088/1742-6596/193/1/012053.

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24

Harriman, Anthony. "(Photo)isomerization dynamics of merocyanine dyes in solution". Journal of Photochemistry and Photobiology A: Chemistry 65, n. 1-2 (aprile 1992): 79–93. http://dx.doi.org/10.1016/1010-6030(92)85034-r.

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25

Hunsche, S., e H. Kurz. "Coherent lattice dynamics of highly photo-excited tellurium". Applied Physics A: Materials Science & Processing 65, n. 3 (1 settembre 1997): 221–29. http://dx.doi.org/10.1007/s003390050570.

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26

Hobley, Jonathan, Ursula Pfeifer-Fukumura, Michael Bletz, Tsuyoshi Asahi, Hiroshi Masuhara e Hiroshi Fukumura. "Ultrafast Photo-Dynamics of a Reversible Photochromic Spiropyran†". Journal of Physical Chemistry A 106, n. 10 (marzo 2002): 2265–70. http://dx.doi.org/10.1021/jp012564a.

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27

Miah, M. Idrish. "Photo-Induced Spin Dynamics in Semiconductor Quantum Wells". Nanoscale Research Letters 4, n. 4 (17 gennaio 2009): 385–88. http://dx.doi.org/10.1007/s11671-008-9241-2.

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28

Shim, Je-Ho, Chul-Hoon Kim, Hong-Guang Piao, Sang-Hyuk Lee, Kyung Min Lee, Jong-Ryul Jeong, Seung-Young Park, Yeon Suk Choi, Dong Eon Kim e Dong-Hyun Kim. "Intriguing Hysteresis Dynamics in Ultrafast Photo‐Induced Magnetization". physica status solidi (b) 257, n. 3 (20 settembre 2019): 1900307. http://dx.doi.org/10.1002/pssb.201900307.

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29

Spinlove, K. Eryn, Gareth W. Richings, Michael A. Robb e Graham A. Worth. "Curve crossing in a manifold of coupled electronic states: direct quantum dynamics simulations of formamide". Faraday Discussions 212 (2018): 191–215. http://dx.doi.org/10.1039/c8fd00090e.

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30

Jiang, Xiantao, Weichun Huang, Rui Wang, Hongbo Li, Xuefeng Xia, Xuemei Zhao, Lanping Hu, Tingting Chen, Yanfeng Tang e Han Zhang. "Photocarrier relaxation pathways in selenium quantum dots and their application in UV-Vis photodetection". Nanoscale 12, n. 20 (2020): 11232–41. http://dx.doi.org/10.1039/c9nr10235c.

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Abstract (sommario):

Selenium, as one of the chain-like materials, has attracted significant attention recently. Here, we investigated the photo-carrier dynamics in Se quantum dots and demonstrated its use for fast photo-detecting in visible regime.

31

Zhao, Mingming, Yan Wang, Niannian Wu, Jun Zhang e Bo Liu. "Photo-assisted synthesis of inorganic polyoxovanadate". Dalton Transactions 49, n. 28 (2020): 9662–67. http://dx.doi.org/10.1039/d0dt01945c.

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We report a photo-assisted synthesis of inorganic mixed-valence polyoxovanadate, [C₉H₁₄N]₆[V₁₅O₃₆Cl], and reveal the kinetics of oxovanadate formation and the dynamics of crystal growth under photo irradiation.

32

MATSUMOTO, Yoshiyasu. "Molecular Beam Scattering and Desorption Dynamics. Dynamics of Photo-Induced Desorption and Dissociation." Hyomen Kagaku 16, n. 9 (1995): 557–63. http://dx.doi.org/10.1380/jsssj.16.557.

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33

Woo, Kyung Chul, e Sang Kyu Kim. "Mode-specific excited-state dynamics of N-methylpyrrole". Physical Chemistry Chemical Physics 21, n. 26 (2019): 14387–93. http://dx.doi.org/10.1039/c9cp00113a.

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34

Gerlinger, Kathinka, Bastian Pfau, Martin Hennecke, Lisa-Marie Kern, Ingo Will, Tino Noll, Markus Weigand et al. "Pump–probe x-ray microscopy of photo-induced magnetization dynamics at MHz repetition rates". Structural Dynamics 10, n. 2 (marzo 2023): 024301. http://dx.doi.org/10.1063/4.0000167.

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We present time-resolved scanning x-ray microscopy measurements with picosecond photo-excitation via a tailored infrared pump laser at a scanning transmission x-ray microscope. Specifically, we image the laser-induced demagnetization and remagnetization of thin ferrimagnetic GdFe films proceeding on a few nanoseconds timescale. Controlling the heat load on the sample via additional reflector and heatsink layers allows us to conduct destruction-free measurements at a repetition rate of 50 MHz. Near-field enhancement of the photo-excitation and controlled annealing effects lead to laterally heterogeneous magnetization dynamics which we trace with 30 nm spatial resolution. Our work opens new opportunities to study photo-induced dynamics on the nanometer scale, with access to picosecond to nanosecond time scales, which is of technological relevance, especially in the field of magnetism.

35

Munjal, Pooja, e Kamal P. Singh. "Optically probing picometer-resolved photo-dynamics of solid surfaces". URSI Radio Science Bulletin 2019, n. 370 (settembre 2019): 12–16. http://dx.doi.org/10.23919/ursirsb.2019.8956139.

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36

Goldie, David. "Trap Generation Dynamics in Photo-Oxidised DEH Doped Polymers". Coatings 5, n. 3 (3 luglio 2015): 263–77. http://dx.doi.org/10.3390/coatings5030263.

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37

SHIBUYA, Kazuhiko, e Kazuhide TSUJI. "Photo-Excited State Dynamics of van der Waals Molecules." Journal of the Spectroscopical Society of Japan 48, n. 5 (1999): 193–206. http://dx.doi.org/10.5111/bunkou.48.193.

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38

FUJII, K., T. TOMARU, T. OHYAMA e E. OTSUKA. "DYNAMICS OF ELECTRON-EXCITON SYSTEM IN PHOTO-EXCITED Ge". Journal of the Magnetics Society of Japan 11, S_1_ISMO (1987): S1_125–128. http://dx.doi.org/10.3379/jmsjmag.11.s1_125.

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39

Gao, Yan, Christine C. Pemberton, Yao Zhang e Peter M. Weber. "On the ultrafast photo-induced dynamics of α-terpinene". Journal of Chemical Physics 144, n. 19 (21 maggio 2016): 194303. http://dx.doi.org/10.1063/1.4948629.

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40

Xie, Haochen, Saurabh Basu e Edward C. DeMeter. "Molecular Dynamics Simulations of Photo-Induced Free Radical Polymerization". Journal of Chemical Information and Modeling 60, n. 12 (1 dicembre 2020): 6314–27. http://dx.doi.org/10.1021/acs.jcim.0c01156.

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41

Matsumoto, Yoshiyasu. "Photochemistry and Photo-Induced Ultrafast Dynamics at Metal Surfaces". Bulletin of the Chemical Society of Japan 80, n. 5 (15 maggio 2007): 842–55. http://dx.doi.org/10.1246/bcsj.80.842.

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42

Handayani, I. P., R. I. Tobey, J. Janusonis, D. A. Mazurenko, N. Mufti, A. A. Nugroho, M. O. Tjia, T. T. M. Palstra e P. H. M. van Loosdrecht. "Dynamics of photo-excited electrons in magnetically ordered TbMnO3". Journal of Physics: Condensed Matter 25, n. 11 (19 febbraio 2013): 116007. http://dx.doi.org/10.1088/0953-8984/25/11/116007.

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43

Yeh, A. T. "Ultrafast Electron Localization Dynamics Following Photo-Induced Charge Transfer". Science 289, n. 5481 (11 agosto 2000): 935–38. http://dx.doi.org/10.1126/science.289.5481.935.

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44

Stolow, Albert. "The three pillars of photo-initiated quantum molecular dynamics". Faraday Discussions 163 (2013): 9. http://dx.doi.org/10.1039/c3fd90021e.

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45

Hovhannisyan, Vladimir, Wen Lo, Chieh Hu, Shean-Jen Chen e Chen Yuan Dong. "Dynamics of femtosecond laser photo-modification of collagen fibers". Optics Express 16, n. 11 (19 maggio 2008): 7958. http://dx.doi.org/10.1364/oe.16.007958.

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46

Terpugov, E. L., e O. V. Degtyareva. "Photo-induced processes and the reaction dynamics of bacteriorhodopsin". Biophysics 60, n. 2 (marzo 2015): 232–43. http://dx.doi.org/10.1134/s0006350915020189.

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47

Liu, H. T., J. P. Müller, M. Beutler, M. Ghotbi, F. Noack, W. Radloff, N. Zhavoronkov, C. P. Schulz e I. V. Hertel. "Ultrafast photo-excitation dynamics in isolated, neutral water clusters". Journal of Chemical Physics 134, n. 9 (2 marzo 2011): 094305. http://dx.doi.org/10.1063/1.3556820.

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48

Sasaki, Minoru, Guang Xun Tai, Satoru Tamura e Masasi Inoue. "Photo-induced carrier dynamics of high Tc oxide superconductors". Physica C: Superconductivity 185-189 (dicembre 1991): 959–60. http://dx.doi.org/10.1016/0921-4534(91)91703-7.

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49

Bai, Huiyu, Jing Xu, Yanxia Zhang, Xiaoya Liu e Orlando J. Rojas. "Dynamics of cyclodimerization and viscoelasticity of photo-crosslinkable PVA". Journal of Polymer Science Part B: Polymer Physics 53, n. 5 (24 novembre 2014): 345–55. http://dx.doi.org/10.1002/polb.23634.

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50

Tachibana, Yasuhiro. "Photo-Generated Charge Carrier Dynamics in Metal Oxide Photocatalysts". ECS Meeting Abstracts MA2023-02, n. 47 (22 dicembre 2023): 2335. http://dx.doi.org/10.1149/ma2023-02472335mtgabs.

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Abstract (sommario):

Solar water splitting is one of the most attractive energy carrier generation processes to utilize solar energy. Light generated hydrogen is a clean energy carrier, since their consumption for energy generation produces only water. Moreover, generated hydrogen can be stored and used whenever required. Hydrogen is mostly used as a feedstock in the chemical and petrochemical industries, e.g. production of ammonia, methanol and fertilisers.[1] The photocatalytic solar water splitting process has been studied extensively over the last half century. However, despite the efforts, no ideal photocatalyst has yet been identified to meet three main requirements for commercialisation: (1) low cost, (2) high solar to hydrogen (STH) efficiency and (3) durability. Over the last two decades, considerable efforts have focused on developing visible light active photocatalysts, and some promising photocatalysts with relatively high water splitting efficiency were discovered.[2] In contrast to search of appropriate photocatalyst (nano)materials, mechanisms of photocatalytic water splitting reactions, in particular charge carrier dynamics of photocatalysts, were little studied. Understanding charge carrier dynamics in photocatalysts will certainly provide an opportunity to design high efficiency photocatalysts. In this presentation, we will show dynamics of photo-generated charge carries in metal oxide photocatalyst by employing a series of transient absorption spectroscopies covering from 150 fs to 100 s over UV-VIS-NIR wavelength ranges.[2] Correlation of the charge carrier dynamics with photocatalysis reactions will be discussed. This work was partly supported by ARC DP fund (DP180103815) and ARC LIEF funds (LE170100235 and LE200100051), Australia, and the Collaborative Research Program of Institute for Chemical Research, Kyoto University (grant number 2023-45 and 2022-99), Japan. We also acknowledge supports from School of Engineering, RMIT University, and Forefront Research Center, Faculty of Science, Osaka University. References [1] N. Armaroli and V. Balzani, ChemSusChem 4 (2011) 21-36. [2] H. Mai, D. Chen, Y. Tachibana, H. Suzuki, R. Abe, Rachel A. Caruso, Chem. Soc. Rev., 50(24) 13692-13729 (2021). [3] H. Liu, M. Liu, R. Nakamura, Y. Tachibana, Appl. Catal. B-Environ., 296 (2021) 120226.