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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Espectómetro óptico criogénico de onda continua para frecuencias inferiores a THz

L Rogić1, N Somun1, S Griffitt1,2

  • 1Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia.

The Review of scientific instruments
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Desarrollamos un espectrómetro óptico sensible para frecuencias de ondas milimétricas (50-1000 GHz) que sobresale a temperaturas criogénicas. Este instrumento permite mediciones precisas de absorción, incluso para materiales reflectantes difíciles, y es ideal para estudiar las propiedades magnéticas.

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Área de la Ciencia:

  • La física
  • Espectroscopia
  • Ciencias de los materiales

Sus antecedentes:

  • La espectroscopia de ondas milimétricas es crucial para caracterizar los materiales, particularmente sus propiedades magnéticas y electrónicas.
  • Los instrumentos existentes a menudo se enfrentan a limitaciones en la sensibilidad, el rango dinámico y las condiciones de funcionamiento, especialmente a temperaturas criogénicas.

Objetivo del estudio:

  • Diseñar y presentar un nuevo espectrómetro óptico de onda continua de alta sensibilidad para frecuencias de onda milimétrica (50-1000 GHz).
  • Lograr un rendimiento óptimo a temperaturas criogénicas para mejorar las capacidades de medición.
  • Permitir mediciones precisas del coeficiente de absorción para una amplia gama de materiales, incluidos los altamente reflectantes.

Principales métodos:

  • Utiliza la foto mezcla de luz infrarroja cercana para generar radiación de ondas milimétricas a través de un amplio espectro de frecuencias.
  • Determina la absorción de potencia óptica mediante la medición directa de la temperatura de la muestra.
  • Diseñados para un rendimiento óptimo a temperaturas criogénicas, incluidas las de helio líquido.

Principales resultados:

  • Alcanza un rango dinámico de hasta 10^6 para el coeficiente de absorción a temperaturas criogénicas.
  • Demuestra la idoneidad para mediciones en muestras altamente reflectantes.
  • Rendimiento validado a través de mediciones de resonancia ferromagnética en YTiO3, resonancia de espín de electrones en un compuesto de referencia y resonancia antiferromagnética en un material magnético de van der Waals.

Conclusiones:

  • El espectrómetro óptico desarrollado ofrece una sensibilidad y un rango dinámico sin precedentes para mediciones de ondas milimétricas a temperaturas criogénicas.
  • El instrumento es versátil, aplicable a diversos materiales magnéticos y compatible con entornos de alto campo magnético.
  • Esta tecnología avanza en el estudio de la física de la materia condensada y la ciencia de los materiales al permitir la caracterización detallada de las resonancias magnéticas.