ESPECTROSCOPIA INFRARROJA TRANSFORMADA FOURIER PDF

The central peak is at the ZPD position "zero path difference" or zero retardation , where the maximal amount of light passes through the interferometer to the detector. The most straightforward way to do this, the "dispersive spectroscopy" technique, is to shine a monochromatic light beam at a sample, measure how much of the light is absorbed, and repeat for each different wavelength. This is how some UV—vis spectrometers work, for example. Fourier-transform spectroscopy is a less intuitive way to obtain the same information.

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Diffuse Reflectance Each technique has strengths and weaknesses which motivate their use for specific samples Watch the tutorial for a short look at the four main ways samples are examined in FT-IR. With the FTIR configured to use a specific sampling device — transmission or ATR for instance — the spectrometer can provide a wide range of information: Most commonly, the identification of an unknown Quantitative information, such as additives or contaminants Kinetic information through the growth or decay of infrared absorptions Or more complex information when coupled with other devices such as TGA, GC or Rheometry Ultimately, FTIR can be a cost-effective answer machine.

Examples are shown and discussed giving an overview of what is possible. Now go into the lab to see the effects of apodization applied to the FTIR spectrum. Introducing Mike Dr. Michael Bradley received his B. He taught graduate and undergraduate chemistry for 15 years, prior to becoming a field applications scientist with Thermo Nicolet, subsequently Thermo Fisher Scientific, in Infrared is a powerful identification tool for functional groups because of the similar absorption frequencies for those groups in different molecules.

The actual frequency is affected by the environment, so the reference chart shows wide bands rather than specific frequencies. The identification of functional groups is a cornerstone of IR spectroscopy and organic chemistry. A part of this is spectral range as shown in this chart, where certain combinations of components provide high performance in specific ranges. There are often trade-offs, such as between high sensitivity using an MCT-A liquid-nitrogen cooled detector versus the wider spectral range but lower sensitivity of the DLaTGS room temperature detector.

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Espectrómetro infrarrojo con transformada de Fourier InfraLUM FT-08

Para comprender cabalmente la espectroscopнa IR, primeramente usted deberб entender los principios del movimiento armуnico simple. Imagine dos esferas, o masas, conectadas por medio de un resorte. En caso de confusiуn, lo que usted estб imaginando debe verse asн. Esto es lo que se conoce como un oscilador armуnico simple. Una vez puestas en movimiento, las esferas comenzarбn a oscilar, o vibrar de aquн para allб a lo largo del resorte, a una cierta frecuencia que dependerб de las masas de las esferas y de la rigidez del resorte. Una esfera de masa pequeсa se moverб con mayor facilidad que otra de masa mayor. Por lo tanto, las masas mбs pequeсas oscilan a mayor frecuencia que las masas mбs grandes.

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