The Design of Resonator Probes with Homogeneous Radiofrequency Fields

Link, J.

doi:10.1007/978-3-642-45697-8_1

Cited by 3 publications

(4 citation statements)

References 32 publications

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“…While there are many potential configurations of the separation capillary and the rf coil that could be pursued to achieve this goal, two such possibilities are described in the following. Over the years, many different rf coil geometries have been developed for a wide range of applications . Figure contains schematic diagrams of solenoidal and saddle coils.…”

Section: Resultsmentioning

confidence: 99%

Monitoring Temperature Changes in Capillary Electrophoresis with Nanoliter-Volume NMR Thermometry

2000

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Nanoliter-volume proton nuclear magnetic resonance (NMR) spectroscopy is used to monitor the electrolyte temperature during capillary electrophoresis (CE). By measuring the shift in the proton resonance frequency of the water signal, the intracapillary temperature can be recorded noninvasively with subsecond temporal resolution and spatial resolution on the order of 1 mm. Thermal changes of more than 65 degrees C are observed under both equilibrium and nonequilibrium conditions for typical CE separation conditions. Several capillary and buffer combinations are examined with external cooling by both liquid and air convection. Additionally, NMR thermometry allows nonequilibrium temperatures in analyte bands to be monitored during a separation. As one example, a plug of 1 mM NaCl is injected into a capillary filled with 50 mM borate buffer. Upon reaching the NMR detector, the temperature in the NaCl band is more than 20 degrees C higher than the temperature in the surrounding buffer. Such observations have direct applicability to a variety of studies, including experiments which utilize sample stacking and isotachophoresis.

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Section: Resultsmentioning

confidence: 99%

Monitoring Temperature Changes in Capillary Electrophoresis with Nanoliter-Volume NMR Thermometry

2000

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“…A high The resistive terms in the above equations are identical to those described in Equations (3), (5), (6), (10), and (11) above, value of R L implies that B 1 is well concentrated within the sample space, whereas high values of R D and R L are undesirable because depending on coil geometry, while L is the value of the inductance of the coil. Typical Q values for microscopy coils are listed in the loss pathways do not contribute to spin excitation [10]. Therefore, SNR enhancement can be achieved by reducing both coil Table I.…”

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confidence: 90%

“…Because images are generally tric field losses. To achieve maximum magnetic fields while reducing electric fields within the coil, it is desirable to use large presented as the magnitude of the transformed data, an adjustment must be made to account for the change in the value of the values of capacitance to achieve resonance [10]. One method for increasing the capacitance in a given coil is through the use of standard deviation of the noise that results when phase information is discarded.…”

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confidence: 98%

“…The birdcage resonator [9] is used for many MR applications because of its uniform B 1 magwhile combining Equations (1), (3), (4), and (7) yields the netic field, and because the rf coil in this case is coaxial with overall SNR: the main magnetic field, allowing for greater accessibility to the sample. The birdcage approximates the ideal current distribution desired to produce a transverse B 1 field for a coaxial cylindrical geometry, as described by the equation It Å I 0 cos(w)ẑ [10],…”

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confidence: 99%

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