K
Keith A. Nelson
Researcher at Massachusetts Institute of Technology
Publications - 750
Citations - 30478
Keith A. Nelson is an academic researcher from Massachusetts Institute of Technology. The author has contributed to research in topics: Terahertz radiation & Femtosecond. The author has an hindex of 85, co-authored 727 publications receiving 26755 citations. Previous affiliations of Keith A. Nelson include Harvard University & Philips.
Papers
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Journal ArticleDOI
Real-time observation of a coherent lattice transformation into a high-symmetry phase
Samuel W. Teitelbaum,Taeho Shin,Johanna W. Wolfson,Yu-Hsiang Cheng,Ilana J. Porter,M. Kandyla,Keith A. Nelson +6 more
TL;DR: In this article, the photoinduced phase transition from the semimetallic, low-symmetry phase of crystalline bismuth into a high symmetry phase whose existence at high electronic excitation densities was predicted based on earlier measurements at moderate excitation density below the damage threshold.
Journal ArticleDOI
Impulsive stimulated scattering study of the structural relaxation dynamics of liquid triphenylphosphite
TL;DR: In this paper, the results of a study of the glass-forming liquid triphenylphosphite covering the normal liquid, supercooled liquid, and glass regimes by a picosecond time-domain light scattering technique are reported.
Journal ArticleDOI
Temperature dependence of low-lying phonon dephasing by ultrafast spectroscopy (optical Kerr effect) in Ag β-alumina and Tl β-alumina
O. Kamishima,Benjamin J. Paxton,Thomas Feurer,Keith A. Nelson,Yoshiki Iwai,Junichi Kawamura,Toshiaki Hattori +6 more
TL;DR: In this article, the dephasing dynamics associated with the time evolution of the vibrational coherence state can be directly identified with the phonon decay in the femtosecond transient.
Journal ArticleDOI
Nonlinear rotational spectroscopy reveals many-body interactions in water molecules.
TL;DR: In this paper, the rotational correlations measured in 2D terahertz rotational spectroscopy were used to reveal the presence of previously unseen metastable water complexes with lifetimes of 100 ps or longer.
Book ChapterDOI
Spatiotemporal femtosecond pulse shaping using a MEMS-based micromirror SLM
TL;DR: In this paper, 2D pulse shaping with a MEMS micromirror SLM allows IR-UV operation at kHz repetition rates at wavelengths longer than the maximum optical delay of the device.