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Alexander B. Barnes
Researcher at ETH Zurich
Publications - 72
Citations - 2528
Alexander B. Barnes is an academic researcher from ETH Zurich. The author has contributed to research in topics: Magic angle spinning & Gyrotron. The author has an hindex of 24, co-authored 61 publications receiving 2180 citations. Previous affiliations of Alexander B. Barnes include Massachusetts Institute of Technology & Whitman College.
Papers
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Journal ArticleDOI
High-Field Dynamic Nuclear Polarization for Solid and Solution Biological NMR
Alexander B. Barnes,G. De Paëpe,P. C. A. van der Wel,Kan-Nian Hu,Chan-Gyu Joo,Vikram S. Bajaj,Melody L. Mak-Jurkauskas,Jagadishwar R. Sirigiri,Judith Herzfeld,Richard J. Temkin,Robert G. Griffin +10 more
TL;DR: This review covers the applications, hardware, polarizing agents, and theoretical descriptions that were developed at the Francis Bitter Magnet Laboratory at Massachusetts Institute of Technology for high-field DNP experiments.
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Continuous-Wave Operation of a Frequency-Tunable 460-GHz Second-Harmonic Gyrotron for Enhanced Nuclear Magnetic Resonance
Antonio C. Torrezan,Seong-Tae Han,Ivan Mastovsky,Michael A. Shapiro,Jagadishwar R. Sirigiri,Richard J. Temkin,Alexander B. Barnes,Robert G. Griffin +7 more
TL;DR: The design, operation, and characterization of a continuous-wave (CW) tunable second-harmonic 460-GHz gyrotron are reported, intended to be used as a submillimeter-wave source for 700-MHz nuclear magnetic resonance experiments with sensitivity enhanced by dynamic nuclear polarization.
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Dynamic nuclear polarization-enhanced solid-state NMR spectroscopy of GNNQQNY nanocrystals and amyloid fibrils
Galia T. Debelouchina,Marvin J. Bayro,Patrick C.A. van der Wel,Marc A. Caporini,Alexander B. Barnes,Melanie Rosay,Werner Maas,Robert G. Griffin +7 more
TL;DR: It is demonstrated that DNP can be used to obtain assignments and site-specific structural information very efficiently and the influence of temperature on the resolution, molecular conformation, structural integrity and dynamics in these two systems.
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THz Dynamic Nuclear Polarization NMR
TL;DR: In this article, the authors describe the dynamic nuclear polarization (DNP) NMR process and illustrate the THz systems needed for this demanding spectroscopic application, including a low loss transmission line; an optimized antenna; and a holder for efficient coupling of THz radiation to the sample.
Journal ArticleDOI
Cryogenic sample exchange NMR probe for magic angle spinning dynamic nuclear polarization
Alexander B. Barnes,Melody L. Mak-Jurkauskas,Melody L. Mak-Jurkauskas,Yoh Matsuki,Yoh Matsuki,Vikram S. Bajaj,Patrick C.A. van der Wel,Ronald DeRocher,Jeffrey A. Bryant,Jagadishwar R. Sirigiri,Richard J. Temkin,Johan Lugtenburg,Judith Herzfeld,Robert G. Griffin +13 more
TL;DR: In this paper, the authors describe a sample exchange system that dramatically improves the efficiency of magic angle spinning (MAS) dynamic nuclear polarization (DNP) experiments by reducing the time required to change samples and by improving longterm instrument stability.