An easily constructed, tuning free, ultra-broadband probe for NMR

Murphree, D.; Cahn, S. B.; Rahmlow, David; DeMille, David

doi:10.1016/j.jmr.2007.05.025

Cited by 23 publications

(13 citation statements)

References 12 publications

(24 reference statements)

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“…Using non-tuned coils for NMR spectroscopy has been considered in the 60s of last century 21,22 ; however, it has remained unexploited in the following decades of developments of ever higher field spectrometers. During the last decade, the 'non-resonant' NMR concept has been picked-up again, and shown useful for lowfrequency and/or low-resolution NMR applications, already corroborating the validity of this approach [23][24][25][26] . However, none of these report on high-resolution high-field applications, and advanced homo-and heteronuclear two-dimensional (2D) NMR applications of non-tuned coils.…”

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confidence: 89%

Multinuclear nanoliter one-dimensional and two-dimensional NMR spectroscopy with a single non-resonant microcoil

Fratila

Gómez

Sýkora³

et al. 2014

Nat Commun

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Nuclear magnetic resonance (NMR) spectroscopy is a powerful analytical technique, but its low sensitivity and highly sophisticated, costly, equipment severely constrain more widespread applications. Here we show that a non-resonant planar transceiver microcoil integrated in a microfluidic chip (detection volume 25 nl) can detect different nuclides in the full broad-band range of Larmor frequencies (at 9.4 T from 61 to 400 MHz). Routine one-dimensional (1D) and two-dimensional (2D), homo-and heteronuclear experiments can be carried out using the broad-band coil set-up. Noteworthy, heteronuclear 2D experiments can be performed in a straightforward manner on virtually any combination of nuclides (from classical 1 H-13 C to more exotic combinations like 19 F-31 P) both in coupled and decoupled mode. Importantly, the concept of a non-resonant system provides magnetic fieldindependent NMR probes; moreover, the small-volume alleviates problems related to field inhomogeneity, making the broad-band coil an attractive option for, for example, portable and table-top NMR systems.

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confidence: 89%

Multinuclear nanoliter one-dimensional and two-dimensional NMR spectroscopy with a single non-resonant microcoil

Fratila

Gómez

Sýkora³

et al. 2014

Nat Commun

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“…The field is shimmed for homogeneity using a set of 5 SC and 14 room temperature (RT) gradient coils. Initially, the field is mapped with an array of 32 NMR probes [24] surrounding the IR; each measures B with precision δB/B ∼ 10 −8 . Next, currents are applied to the shim coils to minimize the r.m.s.…”

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confidence: 99%

Zeeman-Tuned Rotational Level-Crossing Spectroscopy in a Diatomic Free Radical

et al. 2014

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Rotational levels of molecular free radicals can be tuned to degeneracy using laboratory-scale magnetic fields. Because of their intrinsically narrow width, these level crossings of opposite-parity states have been proposed for use in the study of parity-violating interactions and other applications. We experimentally study a typical manifestation of this system using 138 BaF. Using a Stark-mixing method for detection, we demonstrate level-crossing signals with spectral width as small as 6 kHz. We use our data to verify the predicted lineshapes, transition dipole moments, and Stark shifts, and to precisely determine molecular magnetic g-factors. Our results constitute an initial proof-ofconcept for use of this system to study nuclear spin-dependent parity violating effects.PACS numbers: 32.80. Ys, 12.15.Mm, 21.10.Ky It has been suggested that diatomic molecules could be used as a system to measure classes of parity-violating (PV) electroweak interactions that are difficult to access through other means [1][2][3]. The level structure of diatomic free radicals systematically makes it possible to tune states of opposite parity to near degeneracy, using a magnetic field such that the Zeeman shift of the electron spin matches the rotational splitting. Near such a level crossing, the mixing of these long-lived states due to nuclear spin-dependent (NSD) PV interactions is greatly enhanced [4]. This should make it feasible to measure small, poorly understood effects such as those due to nuclear anapole moments and axial hadronic-vector electronic electroweak couplings [3,5,6]. This type of level crossing has also been identified as an attractive system for quantum simulations of conical intersections [7] or magnetic excitons [8], and for sensitive detection of electric fields [9].Here we report an experimental study of Zeeman-tuned rotational level crossings in 138 BaF. Using an electric field pulse to induce transitions between the near-degenerate levels, we demonstrate the ability to understand and control the system with energy resolution at the kHz scale, as desired for the measurement of nuclear spin-dependent PV effects in similar systems. By measuring the magnetic field at several crossings, we extract precise values for poorly known magnetic g-factors; also, by studying transfer efficiency vs. electric field, we deduce values for electric dipole matrix elements between the crossing levels, and for off-resonant Stark shifts not previously con- * e-mail: sidney.cahn@yale. 138 Ba is spinless. In the absence of external fields, the lowest energy levels are described by the Hamiltonianwhere N is the rotational angular momentum, S = 1/2 is the electron spin, and n is a unit vector along the internuclear axis ( = 1 throughout) [11,12]. All parameters of H 0 have been precisely measured [13][14][15]. The rotational constant B is much larger than the spin-rotation (SR) constant γ, the hyperfine (HF) constants b and c, and the centrifugal correction constant D; thus N is a good quantum number, with eigenstates of energ...

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“…Although not prevalent, non-resonant transmission line probes have been used in place of tuned circuits [1][2][3][4][5][6][7][8][9][10], primarily in zero external field studies on ferromagnetic materials [1,6,7,10]. In this communication we show that in addition to its use in zero external field NMR, a simple non-resonant circuit can be applied to a variety of single and double channel experiments on non-ferromagnetic materials.…”

Section: Introductionmentioning

confidence: 99%