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Emission Spectra02:39

Emission Spectra

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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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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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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

221
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
221
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
560
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

245
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
245
Nuclear Fusion02:45

Nuclear Fusion

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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
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Updated: Aug 18, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Emisión de gigaelectronvoltios de una fusión binaria compacta

Alessio Mei1,2, Biswajit Banerjee3,4, Gor Oganesyan3,4

  • 1Gran Sasso Science Institute, L'Aquila, Italy. alessio.mei@gssi.it.

Nature
|December 8, 2022
PubMed
Resumen

Un estallido de rayos gamma de larga duración (GRB) se relacionó con una fusión binaria compacta. Se observó una emisión inesperada de rayos gamma de alta energía, potencialmente por la dispersión inversa de Compton con fotones de kilonova.

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Área de la Ciencia:

  • La astrofísica
  • Astrofísica de alta energía
  • Astronomía de las ondas gravitacionales

Sus antecedentes:

  • Las explosiones de rayos gamma (GRB) se asocian típicamente con el colapso de estrellas masivas.
  • GRB 211211A, a pesar de su larga duración, mostró una emisión de kilonova de infrarrojo óptico, lo que sugiere un origen de fusión binario compacto.
  • Los modelos de resplandor estándar no explican completamente la emisión tardía de los GRB.

Objetivo del estudio:

  • Para investigar el origen de la emisión de rayos gamma de alta energía de GRB 211211A.
  • Determinar si la emisión observada puede explicarse mediante modelos estándar de posluz o si requiere explicaciones alternativas.
  • Explorar las implicaciones de estos hallazgos para comprender las fusiones binarias compactas.

Principales métodos:

  • Observaciones de múltiples longitudes de onda de GRB 211211A, incluidos datos públicos y dedicados.
  • Modelado detallado de la emisión de rayos gamma, comparando las observaciones con las predicciones teóricas de resplandor.
  • Análisis de los mecanismos de emisión potenciales, como la dispersión inversa de Compton.

Principales resultados:

  • Se detectó una emisión significativa de rayos gamma de alta energía (por encima de 0,1 GeV) de GRB 211211A, comenzando 1000 segundos después de la explosión.
  • El flujo de rayos gamma observado en los últimos tiempos superó las predicciones de los modelos de resplandor estándar.
  • La emisión de Kilonova fue identificada como una fuente potencial de fotones semilla para la dispersión inversa de Compton.

Conclusiones:

  • La emisión de alta energía de GRB 211211A probablemente no se deba únicamente a los procesos de resplandor estándar.
  • La emisión inversa de Compton de la interacción de un chorro tardío con fotones de kilonova ofrece una explicación plausible.
  • Este hallazgo proporciona nuevos conocimientos sobre los fenómenos asociados con las fusiones de estrellas de neutrones binarias.