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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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IR Spectroscopy: Molecular Vibration Overview01:24

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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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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks
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Las bandas interestelares difusas infrarrojas en la región del Centro Galáctico.

T R Geballe1, F Najarro, D F Figer

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Nature
|November 4, 2011
PubMed
Resumen

Los investigadores descubrieron 13 nuevas bandas interestelares difusas (BID) en el centro galáctico. Estas características de absorción cósmica, probablemente moléculas basadas en carbono, aparecen en un entorno más duro que los DIBs previamente observados.

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Área de la Ciencia:

  • La astronomía es la astronomía.
  • La astrofísica es la astrofísica.
  • La espectroscopia es una técnica de espectroscopia.

Sus antecedentes:

  • Las bandas interestelares difusas (DIB) son características de absorción observadas en los espectros estelares debido al material interestelar.
  • Se conocen más de 500 DIB, principalmente en longitudes de onda visibles e infrarrojas cercanas.
  • Se sospecha que los portadores de DIBs son moléculas poliatómicas que contienen carbono, pero ninguna ha sido definitivamente identificada.

Objetivo del estudio:

  • Buscar y caracterizar nuevos DIB en longitudes de onda infrarrojas más largas (1.5-1.8 micrómetros).
  • Investigar el origen y el entorno de estos DIB recién descubiertos.
  • Para comparar las propiedades del DIB en el Centro Galáctico con las de otras nubes difusas.

Principales métodos:

  • Observaciones espectroscópicas de alta resolución de estrellas con alta extinción hacia el Centro Galáctico.
  • Análisis de espectros en el intervalo de longitud de onda de 1,5-1,8 micrómetros. análisis de espectros en el intervalo de longitud de onda de 1,5-1,8 micrómetros.
  • Comparación de las fuerzas de DIB con los valores de extinción interestelar.

Principales resultados:

  • Descubrimiento de 13 nuevas bandas interestelares difusas en el rango de 1,5-1,8 micrómetros.
  • Estos DIB se observan predominantemente hacia el Centro Galáctico, lo que sugiere un origen en esta región.
  • Las fuerzas relativas de estos DIBs se correlacionan con la extinción interestelar, similar a DIBs previamente conocidos.

Conclusiones:

  • El Centro Galáctico alberga bandas interestelares difusas previamente desconocidas, originadas en un entorno más cálido y áspero.
  • Es probable que los portadores de estos nuevos DIB sean similares a los de los DIB conocidos, posiblemente moléculas de carbono poliatómicas.
  • La intensidad del DIB generalmente aumenta con la cantidad de material interestelar difuso, independientemente del entorno específico.