K
Krupa Ramasesha
Researcher at Sandia National Laboratories
Publications - 34
Citations - 1955
Krupa Ramasesha is an academic researcher from Sandia National Laboratories. The author has contributed to research in topics: Infrared spectroscopy & Spectroscopy. The author has an hindex of 16, co-authored 29 publications receiving 1664 citations. Previous affiliations of Krupa Ramasesha include Massachusetts Institute of Technology & University of California, Berkeley.
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Journal ArticleDOI
Attosecond band-gap dynamics in silicon
Martin Schultze,Martin Schultze,Krupa Ramasesha,Chaitanya Das Pemmaraju,Shunsuke A. Sato,Desire Whitmore,Andrey Gandman,James S. Prell,Lauren J. Borja,David Prendergast,Kazuhiro Yabana,Daniel M. Neumark,Daniel M. Neumark,Stephen R. Leone,Stephen R. Leone +14 more
TL;DR: Attosecond extreme ultraviolet (XUV) spectroscopy is used to resolve the electron transfer from valence to conduction band states in semiconductors, and distinguished the electron dynamics—which proceed faster than a quadrillionth of a second after laser excitation—from the comparatively slower lattice motion of the silicon atomic nuclei.
Journal ArticleDOI
Ultrafast 2D IR spectroscopy of the excess proton in liquid water
Martin Thämer,Luigi De Marco,Luigi De Marco,Krupa Ramasesha,Aritra Mandal,Aritra Mandal,Andrei Tokmakoff +6 more
TL;DR: Time-resolved vibrational spectra spanning a broad region of the mid-infrared elucidate how water accommodates the protons in acid and suggest a key role for the Zundel complex in aqueous proton transfer.
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Water vibrations have strongly mixed intra- and intermolecular character.
Krupa Ramasesha,Krupa Ramasesha,Luigi De Marco,Aritra Mandal,Andrei Tokmakoff,Andrei Tokmakoff +5 more
TL;DR: These spectra reveal vibrational transitions at all frequencies simultaneous to the excitation, including pronounced cross-peaks to the bend vibration and a continuum of induced absorptions to combination bands that are not present in linear spectra, which provide evidence for strong mixing of inter- and intramolecular vibrations in liquid H2O.
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Structural Rearrangements in Water Viewed Through Two-Dimensional Infrared Spectroscopy
TL;DR: This Account reviews recent ultrafast 2D IR studies at MIT that provide new information on the mechanism of hydrogen-bond rearrangements in liquid water, and demonstrates a more general, unique characteristic of the spectroscopy: if a spectral signature of the transition state exists, then 2DIR can effectively serve as a transition-state spectroscope.
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Real-Time Probing of Electron Dynamics Using Attosecond Time-Resolved Spectroscopy
TL;DR: This review provides an overview of recentAttosecond measurements, focusing on the wealth of knowledge obtained by the application of isolated attosecond pulses in studying dynamics in gases and solid-state systems.