What is Ftir: Definition and 15 Discussions

Fourier-transform infrared spectroscopy (FTIR) is a technique used to obtain an infrared spectrum of absorption or emission of a solid, liquid or gas. An FTIR spectrometer simultaneously collects high-resolution spectral data over a wide spectral range. This confers a significant advantage over a dispersive spectrometer, which measures intensity over a narrow range of wavelengths at a time.
The term Fourier-transform infrared spectroscopy originates from the fact that a Fourier transform (a mathematical process) is required to convert the raw data into the actual spectrum.

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  1. C

    Looking for help with interpretation of FTIR transmission plot

    I've had an oil sample analysed by 2 separate labs; one of the labs came back with the analysis stating large amount of contamination with element X (sorry, I won't prejudice any responses with the element name for now). Unfortunately one lab used transmission FTIR and the other used absorbtion...
  2. mgkii

    Frustrated Total Internal Reflection

    I've been reading into - and watching videos on - FTIR as an explanation of Quantum Tunnelling. The articles and videos I've watched switch between classical and quantum systems so frequently its left me with a question I can't find an answer to - the texts that seem like they might answer it...
  3. hilbert2

    IR transmission through a very thin liquid-filled cell

    Hi, does anyone know if it's possible, with a Nicolet is50 FTIR spectrometer or similar, to measure the transmittance of IR radiation through a cell filled with a liquid sample with thickness in the range of about 10 microns and accurately adjustable? The reason for doing this would be because...
  4. A

    Understanding Infrared Spectroscopy: Analysis of a Recorded Spectrum

    I do attach a plot (pdf and Matlab) of a recorded spectrum where I do not manage to find the gas specie overlapping CO2 Could you help me? Best Alain
  5. P

    Understanding FTIR Peaks of PO4 Compounds

    why on ftir graph there are several peaks for the same compound but at different wavelengths? what causes the different modes of vibration for the same compound (PO4), what causes the v1 ,v3,v4 for PO4... help me please:frown:
  6. L

    A Does Matching FTIR Peaks Indicate Sample Purity?

    I collected FTIR spectrum (using an ATR stage) on a sample and a standard and noticed the following: (1) all the peaks in the spectrum matched, and (2) the standard had several peaks that absorbed more light than the sample (see 2nd page on attachment). Does this mean that the sample is not as...
  7. S

    Optics: Design of Beamsplitter Ge on KBr substrate

    Hi there, I am making a beam splitter for an FTIR, but I do not know the anatomy of a beamsplitter of this type, does anybody have information on the design of these? I plan to order KBr crystal windows and apply the Ge coating myself using physical vapor deposition and assuring quality with a...
  8. G

    Suggestions for FTIR Experiment

    Hi guys, I am going to get a shot to perform a short experiment of my choosing with an FTIR device. Do you have any suggestions/seen any interesting things I could use it for? (Please keep in mind my knowledge in FTIR in very limited so I would really appreciate interesting suggestions which...
  9. E

    Which FTIR preparation for polystyrene?

    If I have some polystyrene and want to analyze it using FTIR for trace elements, what type of sample preparation should I look into? If I were to use a liquid sample preparation, I wouldn't be able to use say, toluene, because the two structures are similar, correct (aromatic)? On the other...
  10. P

    Negative absorption peak in FTIR

    What does it mean if one found negative absorption in uv-vis absorption graph?
  11. P

    Silicon Dioxide (SiO2) FTIR peaks

    Hi, i am looking for the SiO2 FTIR peaks. Thanks
  12. T

    FTIR of Succinic Anhydride in Polymer Synthesis

    I'm working with succinic anhydride and the FTIR spectra shows an anhydride peak. I'm wonder what this peak means and how I can learn more about it. Note I'm working on polymer synthesis.
  13. U

    Understanding Resolution in FTIR Spectroscopy

    Hi, Can anyone help to explain the term of resolution in FTIR spectrocopy machine and... 1) If a sample A show a band centered 1650cm-1 and after some modify, the sample A show a band centered at 1652cm-1, can we consider the sample change in its molecular structure because it has a band...
  14. P

    How does a FTIR machine operate?

    I know the basics about the interferometer and how this causes intereference patterns in a broadband spectrum to occur but I need to clarify a few things and I can't find the answer in any textbook: 1. The detector receives information on the intensity of radiation being received and I have...
  15. P

    FTIR Machine: Interference of Blackbody Radiation Source

    Homework Statement Hi there sorry to keep bombarding you all with these stupid questions but I just can't picture it in my head. In a FTIR machine when the blackbody radiation source is split at the beam splitter and half the frequencies are retarded before making a resultant wave and passing...