Zobrazeno 1 - 10
of 799
pro vyhledávání: '"Stephen R. Leone"'
Autor:
Valeriu Scutelnic, Shota Tsuru, Mátyás Pápai, Zheyue Yang, Michael Epshtein, Tian Xue, Eric Haugen, Yuki Kobayashi, Anna I. Krylov, Klaus B. Møller, Sonia Coriani, Stephen R. Leone
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021)
Radiationless relaxation is ubiquitous in natural processes and often involves excited states that are difficult to observe. Here the authors, combining X-ray transient absorption spectroscopy and computations, provide insight into the photoinduced d
Externí odkaz:
https://doaj.org/article/e298089c6d1247a986e5ca1f47b760ae
Autor:
Hugo J. B. Marroux, Ashley P. Fidler, Aryya Ghosh, Yuki Kobayashi, Kirill Gokhberg, Alexander I. Kuleff, Stephen R. Leone, Daniel M. Neumark
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020)
Here the authors report a study measuring lifetimes of core-hole states of ICl molecule using attosecond transient absorption spectroscopy. They find that lifetimes depend on the alignment of the orbital relative to the molecular axis.
Externí odkaz:
https://doaj.org/article/01a200b6b8e247eea36001caf272ba77
Autor:
Kristina F. Chang, Maurizio Reduzzi, Han Wang, Sonia M. Poullain, Yuki Kobayashi, Lou Barreau, David Prendergast, Daniel M. Neumark, Stephen R. Leone
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-7 (2020)
The reaction trajectories of photoexcited molecules may involve transitions through conical intersections, which are ubiquitous in nature but challenging to characterize. Here the authors provide a complete mapping of molecular dissociation of two mo
Externí odkaz:
https://doaj.org/article/9c266f5f9e174f2693696b865dbc3d20
Autor:
Florian Rott, Maurizio Reduzzi, Thomas Schnappinger, Yuki Kobayashi, Kristina F. Chang, Henry Timmers, Daniel M. Neumark, Regina de Vivie-Riedle, Stephen R. Leone
Publikováno v:
Structural Dynamics, Vol 8, Iss 3, Pp 034104-034104-12 (2021)
Attosecond extreme ultraviolet (XUV) and soft x-ray sources provide powerful new tools for studying ultrafast molecular dynamics with atomic, state, and charge specificity. In this report, we employ attosecond transient absorption spectroscopy (ATAS)
Externí odkaz:
https://doaj.org/article/66c0e165b25d4a5180bc929ab270fd41
Autor:
Henry Timmers, Xiaolei Zhu, Zheng Li, Yuki Kobayashi, Mazyar Sabbar, Maximilian Hollstein, Maurizio Reduzzi, Todd J. Martínez, Daniel M. Neumark, Stephen R. Leone
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-8 (2019)
Excited-state molecular dynamics may be too complex to be resolved by femtosecond spectroscopic studies. Here the authors resolve the competing pathways in the excited state dynamics of methyl bromide by attosecond transient absorption spectroscopy,
Externí odkaz:
https://doaj.org/article/35b746a78ffa453a9e82605ed7f35e81
Autor:
Ashley P. Fidler, Seth J. Camp, Erika R. Warrick, Etienne Bloch, Hugo J. B. Marroux, Daniel M. Neumark, Kenneth J. Schafer, Mette B. Gaarde, Stephen R. Leone
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-8 (2019)
Ultrafast dynamics following light-matter interaction are governed by nonlinear processes. Here the authors show that initial nonlinear signal time-evolution is a consequence of phase grating accumulation using transient grating measurements with att
Externí odkaz:
https://doaj.org/article/1cbad5783a974b988a52955e214d70aa
Autor:
Alexander Britz, Andrew R. Attar, Xiang Zhang, Hung-Tzu Chang, Clara Nyby, Aravind Krishnamoorthy, Sang Han Park, Soonnam Kwon, Minseok Kim, Dennis Nordlund, Sami Sainio, Tony F. Heinz, Stephen R. Leone, Aaron M. Lindenberg, Aiichiro Nakano, Pulickel Ajayan, Priya Vashishta, David Fritz, Ming-Fu Lin, Uwe Bergmann
Publikováno v:
Structural Dynamics, Vol 8, Iss 1, Pp 014501-014501-10 (2021)
Femtosecond carrier dynamics in layered 2H-MoTe2 semiconductor crystals have been investigated using soft x-ray transient absorption spectroscopy at the x-ray free-electron laser (XFEL) of the Pohang Accelerator Laboratory. Following above-bandgap op
Externí odkaz:
https://doaj.org/article/713d72345ae044cba625bf49adbd7685
Autor:
Benjamin W. Toulson, Mario Borgwardt, Han Wang, Florian Lackner, Adam S. Chatterley, C. D. Pemmaraju, Daniel M. Neumark, Stephen R. Leone, David Prendergast, Oliver Gessner
Publikováno v:
Structural Dynamics, Vol 6, Iss 5, Pp 054304-054304-14 (2019)
UV pump–extreme UV (XUV) probe femtosecond transient absorption spectroscopy is used to study the 268 nm induced photodissociation dynamics of bromoform (CHBr3). Core-to-valence transitions at the Br(3d) absorption edge (∼70 eV) provide an atomic
Externí odkaz:
https://doaj.org/article/137e86934efc4658801379417b431b68
Autor:
Romain Géneaux, Iurii Timrov, Christopher J. Kaplan, Andrew D. Ross, Peter M. Kraus, Stephen R. Leone
Publikováno v:
Physical Review Research, Vol 3, Iss 3, p 033210 (2021)
In Peierls-distorted materials, photoexcitation leads to a strongly coupled transient response between structural and electronic degrees of freedom, always measured independently of each other. Here we use transient reflectivity in the extreme ultrav
Externí odkaz:
https://doaj.org/article/53e6e314516c4e37a9f89738d17b4192
Autor:
Marc Rebholz, Thomas Ding, Victor Despré, Lennart Aufleger, Maximilian Hartmann, Kristina Meyer, Veit Stooß, Alexander Magunia, David Wachs, Paul Birk, Yonghao Mi, Gergana Dimitrova Borisova, Carina da Costa Castanheira, Patrick Rupprecht, Georg Schmid, Kirsten Schnorr, Claus Dieter Schröter, Robert Moshammer, Zhi-Heng Loh, Andrew R. Attar, Stephen R. Leone, Thomas Gaumnitz, Hans Jakob Wörner, Sebastian Roling, Marco Butz, Helmut Zacharias, Stefan Düsterer, Rolf Treusch, Günter Brenner, Jonas Vester, Alexander I. Kuleff, Christian Ott, Thomas Pfeifer
Publikováno v:
Physical Review X, Vol 11, Iss 3, p 031001 (2021)
In this work, we use an extreme-ultraviolet (XUV) free-electron laser (FEL) to resonantly excite the I: 4d_{5/2}–σ^{*} transition of a gas-phase di-iodomethane (CH_{2}I_{2}) target. This site-specific excitation generates a 4d core hole located at
Externí odkaz:
https://doaj.org/article/64b424a18119400eb2c7746afff63f50