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NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Transmission Electron Microscopy01:15

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400 keV in...
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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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El transistor de un solo electrón de radiofrecuencia (RF-SET): Un electrómetro rápido y ultrasensible.

Schoelkopf1, Wahlgren, Kozhevnikov

  • 1R. J. Schoelkopf, A. A. Kozhevnikov, D. E. Prober, Departments of Applied Physics and Physics, Yale University, New Haven, CT 06520-8284, USA. P. Wahlgren and P. Delsing, Department of Microelectronics and Nanoscience, Chalmers Uni.

Science (New York, N.Y.)
|June 5, 1998
PubMed
Resumen

Un novedoso electrómetro de transistor de un solo electrón (SET) logra altas velocidades y sensibilidad de carga mediante la medición de la amortiguación del circuito de resonancia. Este avance ofrece una operación significativamente más rápida y una mayor sensibilidad en comparación con los dispositivos anteriores de un solo electrón.

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Área de la Ciencia:

  • Física Física es la física de las cosas.
  • Ingeniería Eléctrica Ingeniería Eléctrica.
  • La computación cuántica es la computación cuántica.

Sus antecedentes:

  • Los electrómetros tradicionales tienen limitaciones en cuanto a velocidad y sensibilidad.
  • Los transistores de un solo electrón (SET) ofrecen un potencial para mediciones de carga de alto rendimiento.
  • Los SET existentes a menudo están limitados por el ruido 1/f y velocidades de funcionamiento más lentas.

Objetivo del estudio:

  • Introducir un nuevo diseño de electrómetro utilizando un transistor de un solo electrón (SET).
  • Para lograr velocidades de funcionamiento significativamente mejoradas y sensibilidad a la carga en comparación con los dispositivos de un solo electrón existentes.
  • Explorar la dualidad electrostática entre el nuevo electrómetro SET y los dispositivos de interferencia cuántica superconductores de radiofrecuencia (RF-SQUID).

Principales métodos:

  • El electrómetro emplea un transistor de un solo electrón (SET) como el elemento de detección central.
  • La lectura se logra mediante la medición de la amortiguación de un circuito de resonancia de 1.7 gigahertz incrustado.
  • El dispositivo funciona como un "doble" electrostático a los dispositivos de interferencia cuántica superconductores de radiofrecuencia (RF-SQUID).

Principales resultados:

  • El nuevo electrómetro demuestra velocidades de funcionamiento más de dos órdenes de magnitud más rápidas que los dispositivos SET anteriores.
  • Se mantiene una ganancia constante desde la corriente continua hasta frecuencias superiores a 100 megahertz.
  • Un dispositivo no optimizado logró una sensibilidad de carga de 1.2 x 10^-5 e/Hz a 1.1 MHz, superando las SET típicas por un orden de magnitud.

Conclusiones:

  • El electrómetro SET desarrollado representa un avance significativo en la medición de carga de alta velocidad y alta sensibilidad.
  • Sus características de rendimiento sugieren aplicaciones potenciales donde la detección rápida y precisa de la carga es crítica.
  • El diseño y el rendimiento del dispositivo ofrecen una nueva vía para mediciones electrónicas sensibles, lo que podría impactar en campos como la computación cuántica y la física de la materia condensada.