A5091733007- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Advanced MRI Techniques and Applications
- Diamond and Carbon-based Materials Research
- NMR spectroscopy and applications
- High-pressure geophysics and materials
- Molecular spectroscopy and chirality
- Force Microscopy Techniques and Applications
- Quantum, superfluid, helium dynamics
- Advanced Chemical Physics Studies
- Advanced Materials Characterization Techniques
- Advanced Fiber Laser Technologies
- Solid-state spectroscopy and crystallography
- Mechanical and Optical Resonators
- Atomic and Molecular Physics
- Business Process Modeling and Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Molecular Spectroscopy and Structure
- Electron Spin Resonance Studies
- Spectroscopy and Quantum Chemical Studies
- Astrophysics and Star Formation Studies
University of Basel
2023
University of California, Berkeley
2015-2021
Helmholtz Institute Mainz
2020
Johannes Gutenberg University Mainz
2020
Lawrence Berkeley National Laboratory
2015-2020
Jagiellonian University
2020
Berkeley College
2017
University of Gothenburg
2009
We review instrumentation for nuclear magnetic resonance (NMR) in zero and ultra-low field (ZULF, below 0.1 $\mu$T) where detection is based on a low-cost, non-cryogenic, spin-exchange relaxation free (SERF) $^{87}$Rb atomic magnetometer. The typical sensitivity 20-30 fT/Hz$^{1/2}$ signal frequencies 1 kHz NMR linewidths range from Hz all the way down to tens of mHz. These features enable precision measurements chemically informative spin-spin couplings as well spin precession fields.
Photodetachment spectroscopy of the FH2(-) and FD2(-) anions allows for direct observation reactive resonances in benchmark reaction F + H2 → HF H. Using cooled anion precursors a high-resolution electron spectrometer, we observe several narrow peaks not seen previous experiments. Theoretical calculations, based on highly accurate potential energy surface, convincingly assign these to associated with quasibound states H DF D product arrangements state transition region reaction. The...
Nuclear magnetic resonance (NMR) spectroscopy is a well-established analytical technique used to study chemicals and their transformations. However, high-field NMR necessitates advanced infrastructure, even cryogen-free benchtop spectrometers cannot be readily assembled from commercially available components. We demonstrate construction of portable zero-field spectrometer employing magnetometer investigate its applications in chemistry. In particular, J-spectra small representative...
Zero- to ultra-low-field nuclear magnetic resonance (ZULF NMR) provides a new regime for the measurement of spin-spin interactions free from effects large fields, such as truncation terms that do not commute with Zeeman Hamiltonian. One interaction, dipole-dipole coupling, is valuable source spatial information in NMR, though many are unobservable high-field and coupling averages zero under isotropic molecular tumbling. Under partial alignment, this retained form so-called residual dipolar...
Abstract Solid state spins have demonstrated significant potential in quantum sensing with applications including fundamental science, medical diagnostics and navigation. The schemes showing best performance under ambient conditions all utilize microwave or radio-frequency driving, which poses a limitation for miniaturization, energy efficiency, non-invasiveness of sensors. We overcome this by demonstrating purely optical approach to coherent sensing. Our scheme involves the 15 N nuclear...
Radiative association of CN is simulated using a quantum dynamical as well semiclassical approach. A comparison the resulting energy-resolved cross sections reveals striking effects that are due to shape resonances. These, in turn, arise because states quasibound by centrifugal barrier. The quantal rate coefficient for temperatures from 40 1900 K has been computed Breit–Wigner theory account Comparison with results obtained Singh and Andreazza [Astrophys. J. 537, 261 (2000)] shows method,...
Here we demonstrate that a term in the nuclear spin Hamiltonian, antisymmetric J-coupling, is fundamentally connected to molecular chirality. We propose and simulate magnetic resonance (NMR) experiment observe this interaction differentiate between enantiomers without adding any additional chiral agent sample. The J-coupling may be observed presence of orientation by an external electric field. opposite parity coupling tensor dipole moment yields sign change enantiomers. show how influences...
We present a two-dimensional method for obtaining 13C-decoupled, 1H-coupled nuclear magnetic resonance (NMR) spectra in zero field using coherent spin-decoupling. The result is spectrum determined only by the proton–proton J-coupling network. Detection of NMR signals requires at least two different spin species, but proton J-spectrum independent isotopomer, thus potentially simplifying and thereby improving analytical capabilities zero-field NMR. protocol does not rely on difference Larmor...
We use low-amplitude, ultralow frequency pulses to drive nuclear spin transitions in zero and magnetic fields. In analogy high-field NMR, a range of sophisticated experiments becomes available as these allow narrow-band excitation. As first demonstration, with excitation bandwidths 0.5-5 Hz are used for population redistribution, selective excitation, coherence filtration. These methods helpful when interpreting zero- ultralow-field NMR spectra that contain large number transitions.
This paper proposes a mechanism to detect molecular parity nonconservation. The authors use theoretical analysis of the effect and conceptual experimental design using unconventional zero- ultralow-field (ZULF) NMR regime that enables direct measurement antisymmetric J-coupling interactions are truncated in high-field experiments
We describe the construction of a fast field cycling device capable sweeping 4-order-of-magnitude range magnetic fields, from ∼1 mT to 7 T, in under 700 ms, and which is further extendable 1 nT-7 T range. Central this system high-speed sample shuttling mechanism between superconducting magnet shield, with capability access arbitrary fields high resolution. Our instrument serves as versatile platform harness inherent dichotomy spin dynamics on offer at low fields—in particular, anisotropy,...
Nuclear magnetic resonance (NMR) spectroscopy is a well-established analytical technique used to study chemicals and their transformations. However, high-eld NMR necessitates advanced infrastructure even cryogen-free benchtop spectrometers cannot be readily assembled from commercially available components. We demonstrate construction of portable zero-field spectrometer employing magnetometer investigate its applications in chemistry. In particular, J -spectra small representative...
Here we demonstrate that a term in the nuclear spin Hamiltonian, antisymmetric \textit{J}-coupling, is fundamentally connected to molecular chirality. We propose and simulate magnetic resonance (NMR) experiment observe this interaction differentiate between enantiomers without adding any additional chiral agent sample. The \textit{J}-coupling may be observed presence of orientation by an external electric field. opposite parity coupling tensor dipole moment yields sign change enantiomers....
We describe the construction of a fast field cycling device capable sweeping 4-order-of-magnitude range magnetic fields, from ~1mT to 7T, in under 700ms. Central this system is high-speed sample shuttling mechanism between superconducting magnet and shield, with capability access arbitrary fields high resolution. Our instrument serves as versatile platform harness inherent dichotomy spin dynamics on offer at low - particular, anisotropy, manipulation, rapid entanglement growth well long...
<p>Nuclear magnetic resonance (NMR) spectroscopy is a well-established analytical technique used to study chemicals and their transformations. However, high-eld NMR necessitates advanced infrastructure even cryogen-free benchtop spectrometers cannot be readily assembled from commercially available components. We demonstrate construction of portable zero-field spectrometer employing magnetometer investigate its applications in chemistry. In particular, <i>J</i>-spectra small...