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Topic: Fourier transform spectroscopy


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In the News (Thu 20 Jun 19)

  
  Fourier transform spectroscopy
Fourier transform spectroscopy is a measurement technique whereby spectra are collected based on the response from a pulse of electromagnetic radiation.
Fourier transform spectroscopy is more sensitive and has a much shorter sampling time than conventional spectroscopic techniques.
Instead of varying the energy of the electromagnetic radiation, Fourier Transform spectroscopy exposes the sample to a single pulse of radiation and measures the response.
www.ebroadcast.com.au /lookup/encyclopedia/ft/FTIR.html   (527 words)

  
 Infrared spectroscopy - Wikipedia, the free encyclopedia
Infrared spectroscopy (IR Spectroscopy) is the subset of spectroscopy that deals with the Infrared part of the electromagnetic spectrum.
The resonant frequencies or vibrational frequencies are determined by the shape of the molecular potential energy surfaces, the masses of the atoms and, eventually by the associated vibronic coupling.
Performing a mathematical Fourier Transform on this signal results in a spectrum identical to that from conventional (dispersive) infrared spectroscopy.
en.wikipedia.org /wiki/Infrared_spectroscopy   (1407 words)

  
 [No title]
Fourier transform infrared attenuated total reflection spectroscopy provided evidence that the protein is composed of 44% -helices, 25% -sheets, 16% -turns, and 15% random structures, notably the proportion of -helices is greater than that corresponding to the transmembrane domains predicted by exchanger hydropathy profile.
The signals are first Fourier transformed in the X direction to extract the frequency domain information and then in the phase encoding direction to extract information about the locations in the phase encoding gradient direction.
The Fourier transforms of the interferograms obtained by the FTS are performed by the observatory staff in Tucson following the observing run.
www.lycos.com /info/fourier-transform--miscellaneous.html   (494 words)

  
 Entangled photon fourier transform spectroscopy patent invention   (Site not responding. Last check: 2007-10-13)
[0058] In equation (17),.sub.c is the Fourier cosine transform.
The signal-to-noise ratio for a corresponding conventional (non-entangled-photon) Fourier transform spectrometer is estimated presently for the purposes of comparison with the embodiment of FIG.
[0065] In contrast, the signal-to-noise ratio when.tau.=0 of the entangled-photon Fourier transform spectrometer embodiment of FIG.
www.freshpatents.com /Entangled-photon-fourier-transform-spectroscopy-dt20050922ptan20050206904.php?type=description   (7670 words)

  
 III
R.A. Komoroski and G.C. Levy, "Fourier Transform NMR Spectroscopy," Magn.
Fourier Transforms in Chemistry and Spectroscopy," J. Chem.
D.K. Graff, "Fourier and Hadamard: Transforms in Spectroscopy," J. Chem.
wulfenite.fandm.edu /NMRspectroscopy/iii.htm   (963 words)

  
 Fourier transform spectroscopy - Wikipedia, the free encyclopedia
Fourier transform spectroscopy is a measurement technique whereby spectra are collected based on measurements of the temporal coherence of a radiative source, using time-domain measurements of the electromagnetic radiation or other type of radiation.
The Fourier transform spectrometer is just a Michelson interferometer but one of the two fully-reflecting mirrors is movable, allowing a variable delay (in the travel-time of the light) to be included in one of the beams.
A pulsed Fourier transform spectrometer is usually used to measure the spectrum of the light transmitted through a laboratory sample.
en.wikipedia.org /wiki/Fourier_transform_spectroscopy   (916 words)

  
 Fourier Transform Infrared Spectroscopy - A Tool for Understanding the Deterioration of Plastics   (Site not responding. Last check: 2007-10-13)
One of the most potent analytical techniques being employed to search for chemical clues is Fourier transform infrared (MR) spectroscopy, which allows researchers to measure accurately the proportions of chemical groups in the affected plastics and so track the degradation.
Warwick-based company Nicolet Instruments was among the pioneers of FTIR spectroscopy in the early 1970’s and its technology is now used by both industry and museum conservators in the battle against plastic breakdown.
FTIR spectroscopy showed that the crystals were in fact triphenyl phosphate.’ This information merely enhanced the mystery, though.
www.azom.com /details.asp?ArticleID=1513   (1036 words)

  
 Transmembrane Helix Stability: The Effect of Helix-Helix Interactions Studied by Fourier Transform Infrared ...
A Fourier transform infrared spectroscopy study of the structure and conformational changes of the human erythrocyte glucose transporter.
Polarized Fourier transform infrared spectroscopy of bacteriorhodopsin: transmembrane alpha helices are resistant to hydrogen/deuterium exchange.
Subtraction of atmospheric water contribution in Fourier transform infrared spectroscopy of biological membranes and proteins.
www.biophysj.org /cgi/content/full/74/2/988   (4352 words)

  
 Fourier transform infrared spectroscopy   (Site not responding. Last check: 2007-10-13)
Fourier Transform Infrared spectroscopy (FTIR) is a non-destructive technique for determination of chemical compounds in liquids, gases, powders and films.
FTIR spectroscopy is used within a broad range of applications including; biomedical research, foodstuff analysis, gas and solid surface analysis.
We develop new analytical methods, broadening the range of applications and moreover, develop and test instrumentation for the purpose of pushing the detection limits.
www.risoe.dk /ofd/ftir   (64 words)

  
 Fourier Transform Infrared Spectroscopy (FT-IR)
Infrared spectroscopy is useful for the identification of both organic and inorganic compounds.
Thus, infrared spectroscopy is ideal for the identification of functional groups present within a sample.
In Attenuated Total Reflectance (ATR) spectroscopy all that is required for analysis is that the sample of interest be brought into contact with the ATR crystal.
www.mri.psu.edu /mcl/techniques/ftir.asp   (1168 words)

  
 Wiley::Spectroscopy and the Fourier Transform
The growth of Fourier Transform spectroscopy over the last two decades has been nothing short of astounding especially since it lay dormant for the 8 decades prededing this development.
As a result many Fourier transform spectrometers are placed in labs and used by people who do not understand their operation.
Similarly the Fourier transform itself is presented in a graphical rather than mathematical fashion so that it is easily grasped.
www.wiley.com /WileyCDA/WileyTitle/productCd-0471185744.html   (282 words)

  
 FTIR - Fourier Transform Infrared Spectroscopy
Fourier Transform Infrared Spectroscopy (FTIR) is a powerful tool for identifying types of chemical bonds in a molecule by producing an infrared absorption spectrum that is like a molecular "fingerprint".
The term Fourier Transform Infrared Spectroscopy (FTIR) refers to a fairly recent development in the manner in which the data is collected and converted from an interference pattern to a spectrum.
To identify less common materials, IR will need to be combined with nuclear magnetic resonance, mass spectrometry, emission spectroscopy, X-ray diffraction, and/or other techniques.
www.wcaslab.com /tech/tbftir.htm   (683 words)

  
 Fourier Transform Infrared Spectroscopy at Aberystwyth home page
Fourier transform infrared (FT-IR) spectroscopy measures dominantly vibrations of functional groups and highly polar bonds.
Within Microbiology, FT-IR has been shown to allow the chemically-based discrimination of intact microbial cells, without their destruction, and produces complex biochemical fingerprints which are reproducible and distinct for different bacteria.
Helm, D., Labischinski, H., Schallehn, G. and Naumann, D. Classification and identification of bacteria by Fourier transform infrared spectroscopy.
qbab.aber.ac.uk /roy/ftir/ftirhome.htm   (438 words)

  
 Fourier-Transform Microwave Spectroscopy for Chemical Analysis
One such instrument suggested to have significant potential for gas analysis is the Fourier-transform microwave (FTMW) spectrometer, which uses microwave radiation and the time-domain techniques of nuclear-magnetic-resonance (NMR) spectroscopy to record the rotational spectrum of a molecule in the microwave spectral region, i.e., between approximately 6 GHz and 40 GHz.
FTMW spectroscopy was developed approximately 20 years ago to measure the rotational spectra of molecules and exotic chemical species such, as dimers, hydrogen-bonded complexes, and free radicals, to extract fundamental molecular properties.
The technique operates by injecting a pulse of a gas sample into a high-Q microwave cavity situated in a vacuum chamber, where it is interrogated by microwave radiation.
physics.nist.gov /Divisions/Div844/facilities/ftmw/ftmw.html   (593 words)

  
 Applications of Fourier Transform Raman Spectroscopy in Forensic Science
Raman spectroscopy was not only able to distinguish between the types of polymers employed in the manufacture of the lenses but, was also found to be sensitive to the thermal history imparted to the item during its production.
A number of possible new applications for the use of Fourier Transform Raman spectroscopy (FT-Raman) in forensic science have been investigated.
The FT-Raman technique is useful in forensic document examination of paper because of its ability to identify mineral components and some of the minor components which are associated with the origin of the cellulose and technology of paper production.
www.astm.org /JOURNALS/FORENSIC/PAGES/2355.htm   (402 words)

  
 Fourier Transform Spectroscopy Group Activity Report
The group has continued its work in the areas of atomic and molecular spectroscopy, and the development of Fourier transform spectrometers that operate in the ultra-violet and vacuum ultra-violet regions of the spectrum.
These instruments, of uniquely high resolving power, efficiency and range, are being used to provide the data needed for the better understanding of the atmospheres both of stars and of the earth.
Projects funded by ESA and NERC (with University College London and the Molecular Spectroscopy Facility at Rutherford Appleton Laboratory, (RAL) investigate the water vapour spectra in the near-infrared and visible spectral regions aiming to provide precise spectral line parameters, as well as data on weak, previously unobserved, spectral absorptions.
www.sp.ph.ic.ac.uk /~jpickering/FTS/ftsrepor.htm   (739 words)

  
 FTIR Fourier Transform - Infrared Spectroscopy - Innovatech Labs
Fourier transform infrared spectroscopy (FTIR) is an analytical technique used to identify organic (and in some cases inorganic) materials.
Materials can be quantified using FTIR as long as a standard curve of known concentrations of the component of interest can be created.
Innovatech Labs offers a broad range of cleanliness testing, surface analytical techniques, organic spectroscopies, bulk testing methods, and consulting services.
www.innovatechlabs.com /analytical-services-ftir.htm   (233 words)

  
 Amazon.com: Fundamentals of Fourier Transform Infrared Spectroscopy: Books: Brian C. Smith   (Site not responding. Last check: 2007-10-13)
Fundamentals of Fourier Transform Infrared Spectroscopy teaches the basics of FTIR spectroscopy to those new to the field and serves as an excellent reference for experienced users.
The purpose of this book is to introduce the reader to the fundamental concepts of Fourier Transform Infrared (FTIR) spectroscopy.
Fourier Transform Infrared: A Constantly Evolving Technology (Ellis Horwood Series in Analytical Chemistry) by Sean F. Johnston on page 13, page 53, and page 86
www.amazon.com /Fundamentals-Fourier-Transform-Infrared-Spectroscopy/dp/0849324610   (1081 words)

  
 FT-IR Spectroscopy - Raman Spectroscopy - UV-VIS Spectroscopy - Near Infrared Spectroscopy - Molecular Spectroscopy ...   (Site not responding. Last check: 2007-10-13)
Ideal for investigative analysis or QC applications, spectroscopy is used to determine the molecular composition of a wide range of complex samples, including liquids, solids, and gases.
A series of FREE Spectroscopic Solutions Seminars will be hosted this fall, providing useful information on the theories and applications of FT-IR, Raman, IR imaging, IR microscpectroscopy and sampling techniques that will benefit everyone in your laboratory.
Raman is particularly useful in the analysis of molecular structure and geometries, and is complementary to FT-IR.
www.nicolet.com   (290 words)

  
 Failure Analysis - Non-Destructive Evaluation (NDE) - Fourier Infrared Transform Spectroscopy (FTIR)   (Site not responding. Last check: 2007-10-13)
Fourier transform infrared (FTIR) spectroscopy is a powerful analytical tool for characterizing and identifying organic molecules.
Using the IR spectrum, chemical bonds and the molecular structure of organic compounds can be identified.
To perform FTIR, CALCE uses a NICOLET Magna-IR 550 FTIR Spectrometer with a SPECTRA-TECH FTIR Microscope.
www.calce.umd.edu /general/Facilities/ftirnde.htm   (115 words)

  
 Fourier Transform Spectroscopy Instrumentation Engineering
This course teaches the fundamentals of Fourier transform spectroscopy instrumentation (Michelson interferometer-based spectrometers).
The first part provides an introduction to the design of Fourier transform spectrometers, which include the optical, mechanical and the electrical design elements.
He recently developed a highly sensitive Fourier transform spectrometer for noninvasive biomedical applications.
spie.org /web/meetings/programs/pw01/courses/SC314.html   (275 words)

  
 Fourier transform mechanical spectroscopy
A powerful new experimental method of determining the dynamic mechanical behaviour of viscoelastic materials is described.
The method, Fourier transform mechanical spectroscopy (FTMS), consists of superposing and deconvoluting discrete Fourier transforms obtained from a single stress relaxation experiment using a novel sampling scheme.
The theory of the sampling scheme and the superposition of the transforms is described elsewhere.
stacks.iop.org /0022-3727/19/L89   (282 words)

  
 Time resolved Fourier transform spectroscopy
High-sensitivity time-resolved intracavity laser Fourier transform spectroscopy with vertical cavity surface emitting multiple quantum well lasers, Nathalie Picqué, Guy Guelachvili, A.A Kachanov, Optics Letters 28, 313-315, 2003.
Time-Resolved Fourier Transform Spectroscopy applied to collisional relaxation study of the B
High information time-resolved Fourier transform spectroscopy at work, N. Picqué, G. Guelachvili, Appl.
www.laser-fts.org /trfts.html   (138 words)

  
 A Measurement of Human Hair Oxidation by Fourier Transform Infrared Spectroscopy
by Fourier transform infrared spectroscopy (FTIR) in hair samples from 135 whites and found to provide a degree of discrimination in treated and untreated hairs.
Human scalp hair samples were oxidized to determine the sulfonic acid absorption peak.
The effects of moisture, laboratory storage, natural hair color, and variation over time were also studied.
www.astm.org /JOURNALS/FORENSIC/PAGES/590.htm   (222 words)

  
 Fourier transform spectroscopy   (Site not responding. Last check: 2007-10-13)
3.4 Response to a p/2 pulse and Fourier transform spectroscopy
We find the same temporal dependence as that of m(t).
Therefore the Fourier transform of Mx(t), which is the response to a
dpwww.epfl.ch /cours/spin_dyn_final/fourier_transf_spectro.htm   (304 words)

  
 Fourier transform spectroscopy FTS
Guelachvili and N. Picqué, in Handbook of Vibrational Spectroscopy, J.M. Chalmers and P.R.Griffiths (Eds), John Wiley and Sons, Ltd, Volume 1, 150 – 164, 2002.
Sensitive instrumental developments in high-resolution laser and Fourier transform spectroscopies
Fast phase-selective detection of transient species with step-scan Fourier transform spectroscopy
www.laser-fts.org /fouriertransformspectroscopy.html   (85 words)

  
 Fourier Transform Infrared Spectroscopy   (Site not responding. Last check: 2007-10-13)
Specialized experiments to simulate process conditions can be designed.
At CAMMP FTIR Spectroscopy is used to determine a variety of materials' properties including structural details, the nature of OH groups in zeolites, and the type, strength, and distribution of acid sites in zeolites as well as other porous materials.
IR Spectra of USML-2 (Flight) and control (Terrestrial) zeolite beta acquired at ambient conditions.
www.coe.neu.edu /Research/cammp/CAMMP_FTIR.htm   (194 words)

  
 Fourier Transform Infrared Spectroscopy Group
Miroslaw Handke, Ph.D. eslawa Paluszkiewicz, Ph.D. Anna Stoch, Ph.D. The group consists of the IR Division of the Regional Laboratory and the Group of Silicate Chemistry at the Faculty of Materials Science and Ceramics of the Academy of Mining and Metallurgy.
Maka, Determination of Hydrocarbons in the Gases from Vehicle Exhausts by FTIR Spectroscopy, Microchimica Acta, 14, 1997, 565.
Kwiatek, A. Parczewski, S. Walas, Renal Stone Studies Using Vibrational Spectroscopy and Trace Analysis, Biospectroscopy, 3, 1997, 403.
www2.uj.edu.pl /RegLab/infrared   (229 words)

  
 ISO 17025 accredited/ISO 9001:2000 certified Ovonic Central Analytical Lab specializes in materials preparation & ...
ISO 17025 accredited/ISO 9001:2000 certified Ovonic Central Analytical Lab specializes in materials preparation & characterization using electron & optical microscopy, energy & wavelength spectroscopy, ICP, surface analysis, UV-VIS-IR, x-ray diffract
Fourier Transform Infrared Spectroscopy (FT-IR): Useful for identifying organic and inorganic compounds by analysis of vibrational properties of the sample.
To learn more about our proprietary cutting-edge technological systems solutions.
www.ovonic.com /se_ovonic_fourier_transform_infrared_spectroscopy.cfm   (119 words)

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