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- Attenuated_total_reflectance abstract "Attenuated total reflection (ATR) is a sampling technique used in conjunction with infrared spectroscopy which enables samples to be examined directly in the solid or liquid state without further preparation.ATR uses a property of total internal reflection resulting in an evanescent wave. A beam of infrared light is passed through the ATR crystal in such a way that it reflects at least once off the internal surface in contact with the sample. This reflection forms the evanescent wave which extends into the sample. The penetration depth into the sample is typically between 0.5 and 2 micrometres, with the exact value being determined by the wavelength of light, the angle of incidence and the indices of refraction for the ATR crystal and the medium being probed. The number of reflections may be varied by varying the angle of incidence. The beam is then collected by a detector as it exits the crystal. Most modern infrared spectrometers can be converted to characterise samples via ATR by mounting the ATR accessory in the spectrometer's sample compartment. The accessibility of ATR-FTIR has led to substantial use by the scientific community.This evanescent effect only works if the crystal is made of an optical material with a higher refractive index than the sample being studied. Otherwise light is lost to the sample. In the case of a liquid sample, pouring a shallow amount over the surface of the crystal is sufficient. In the case of a solid sample, it is pressed into direct contact with the crystal. Because the evanescent wave into the solid sample is improved with a more intimate contact, solid samples are usually firmly clamped against the ATR crystal, so that trapped air is not the medium through which the evanescent wave travels, as that would distort the results. The signal to noise ratio obtained depends on the number of reflections but also on the total length of the optical light path which dampens the intensity. Therefore, a general claim that more reflections give better sensitivity cannot be made.Typical materials for ATR crystals include germanium, KRS-5 and zinc selenide, while silicon is ideal for use in the Far-IR region of the electromagnetic spectrum. The excellent mechanical properties of diamond make it an ideal material for ATR, particularly when studying very hard solids, but its much higher cost means it is less widely used. The shape of the crystal depends on the type of spectrometer and nature of the sample. With dispersive spectrometers, the crystal is a rectangular slab with chamfered edges, seen in cross-section in the illustrations. Other geometries use prisms, half-spheres, or thin sheets.".
- Attenuated_total_reflectance thumbnail ATR_path-en.svg?width=300.
- Attenuated_total_reflectance wikiPageExternalLink index.html.
- Attenuated_total_reflectance wikiPageID "5398131".
- Attenuated_total_reflectance wikiPageLength "6924".
- Attenuated_total_reflectance wikiPageOutDegree "26".
- Attenuated_total_reflectance wikiPageRevisionID "695437782".
- Attenuated_total_reflectance wikiPageWikiLink Atmosphere_of_Earth.
- Attenuated_total_reflectance wikiPageWikiLink Category:Scientific_techniques.
- Attenuated_total_reflectance wikiPageWikiLink Category:Spectroscopy.
- Attenuated_total_reflectance wikiPageWikiLink Diamond.
- Attenuated_total_reflectance wikiPageWikiLink Dispersion_(optics).
- Attenuated_total_reflectance wikiPageWikiLink Electromagnetic_spectrum.
- Attenuated_total_reflectance wikiPageWikiLink Evanescent_field.
- Attenuated_total_reflectance wikiPageWikiLink Forensic_science.
- Attenuated_total_reflectance wikiPageWikiLink Fourier_transform_infrared_spectroscopy.
- Attenuated_total_reflectance wikiPageWikiLink Germanium.
- Attenuated_total_reflectance wikiPageWikiLink Infrared.
- Attenuated_total_reflectance wikiPageWikiLink Infrared_spectroscopy.
- Attenuated_total_reflectance wikiPageWikiLink Light.
- Attenuated_total_reflectance wikiPageWikiLink Liquid.
- Attenuated_total_reflectance wikiPageWikiLink Microfluidics.
- Attenuated_total_reflectance wikiPageWikiLink Micrometre.
- Attenuated_total_reflectance wikiPageWikiLink Polyhistidine-tag.
- Attenuated_total_reflectance wikiPageWikiLink Refractive_index.
- Attenuated_total_reflectance wikiPageWikiLink Silicon.
- Attenuated_total_reflectance wikiPageWikiLink Solid.
- Attenuated_total_reflectance wikiPageWikiLink Thallium_halides.
- Attenuated_total_reflectance wikiPageWikiLink Total_internal_reflection.
- Attenuated_total_reflectance wikiPageWikiLink Trace_evidence.
- Attenuated_total_reflectance wikiPageWikiLink Zinc_selenide.
- Attenuated_total_reflectance wikiPageWikiLink File:ATR-Halterung.jpg.
- Attenuated_total_reflectance wikiPageWikiLink File:ATR_path-en.svg.
- Attenuated_total_reflectance wikiPageWikiLinkText "ATR-IR".
- Attenuated_total_reflectance wikiPageWikiLinkText "ATR-cell".
- Attenuated_total_reflectance wikiPageWikiLinkText "Attenuated total reflectance".
- Attenuated_total_reflectance wikiPageWikiLinkText "attenuated total reflectance".
- Attenuated_total_reflectance wikiPageWikiLinkText "reflectance".
- Attenuated_total_reflectance wikiPageUsesTemplate Template:Cite_book.
- Attenuated_total_reflectance subject Category:Scientific_techniques.
- Attenuated_total_reflectance subject Category:Spectroscopy.
- Attenuated_total_reflectance hypernym Technique.
- Attenuated_total_reflectance type TopicalConcept.
- Attenuated_total_reflectance type Physic.
- Attenuated_total_reflectance type Technique.
- Attenuated_total_reflectance comment "Attenuated total reflection (ATR) is a sampling technique used in conjunction with infrared spectroscopy which enables samples to be examined directly in the solid or liquid state without further preparation.ATR uses a property of total internal reflection resulting in an evanescent wave. A beam of infrared light is passed through the ATR crystal in such a way that it reflects at least once off the internal surface in contact with the sample.".
- Attenuated_total_reflectance label "Attenuated total reflectance".
- Attenuated_total_reflectance sameAs Q300035.
- Attenuated_total_reflectance sameAs Zeslabený_úplný_odraz.
- Attenuated_total_reflectance sameAs ATR-Infrarotspektroskopie.
- Attenuated_total_reflectance sameAs Riflettanza_totale_attenuata.
- Attenuated_total_reflectance sameAs Attenuatie_van_de_totale_reflectie.
- Attenuated_total_reflectance sameAs ATR_(spektroskopia).
- Attenuated_total_reflectance sameAs m.0dk0sx.
- Attenuated_total_reflectance sameAs Q300035.
- Attenuated_total_reflectance wasDerivedFrom Attenuated_total_reflectance?oldid=695437782.
- Attenuated_total_reflectance depiction ATR_path-en.svg.
- Attenuated_total_reflectance isPrimaryTopicOf Attenuated_total_reflectance.