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Videos de Conceptos Relacionados

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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.
Different compounds display unique properties due to their...
IR Spectrometers01:25

IR Spectrometers

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...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
IR Spectrum01:19

IR Spectrum

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.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...

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Video Experimental Relacionado

Updated: Jul 12, 2026

Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS)
11:04

Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS)

Published on: May 3, 2011

Astronomía infrarroja después de IRAS.

G H Rieke, M W Werner, R I Thompson

    Science (New York, N.Y.)
    |February 21, 1986
    PubMed
    Resumen

    El catálogo del satélite de astronomía infrarrojo (IRAS) presenta un desafío para los astrónomos. Las futuras observaciones con el Space Infrared Telescope Facility (SIRTF) son cruciales para el estudio de estas fuentes cósmicas.

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    Área de la Ciencia:

    • La astronomía es la astronomía.
    • La astrofísica es la astrofísica.
    • Cosmología Cosmología.

    Sus antecedentes:

    • El catálogo del satélite de astronomía infrarroja (IRAS) contiene 250.000 fuentes infrarrojas.
    • Muchas fuentes IRAS son difíciles de estudiar con la tecnología actual, ya que IRAS ya no está operativo.

    Objetivo del estudio:

    • Para resaltar la necesidad de la Instalación del Telescopio Espacial Infrarrojo (SIRTF) para el estudio de las fuentes IRAS.
    • Para enfatizar el potencial de SIRTF en la comprensión del nacimiento y la evolución cósmica.

    Principales métodos:

    • Análisis de los desafíos planteados por el catálogo IRAS.
    • Propuesta para el uso de la Instalación del Telescopio Espacial Infrarrojo (SIRTF).

    Principales resultados:

    • SIRTF es esencial para estudiar muchas fuentes IRAS que ya no son detectables.
    • SIRTF ofrece un aumento de miles de veces en la sensibilidad en comparación con IRAS y los telescopios existentes.

    Conclusiones:

    • El Space Infrared Telescope Facility (SIRTF) es fundamental para avanzar en nuestra comprensión de los objetos y fenómenos celestes.
    • Las capacidades avanzadas de SIRTF permitirán nuevos descubrimientos en la formación de planetas, estrellas y galaxias.