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Infrared (IR) spectroscopy by ATR is applicable to the same chemical or biological systems as the transmission method. One advantage of ATR-IR over transmission-IR is the limited path length into the sample. This avoids the problem of strong attenuation of the IR signal in highly absorbing media such as aqueous solutions.
Fourier transform infrared spectroscopy (FTIR) [1] 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.
An interferogram from an FTIR measurement. The horizontal axis is the position of the mirror, and the vertical axis is the amount of light detected. This is the "raw data" which can be Fourier transformed to get the actual spectrum. Fourier transform infrared (FTIR) spectroscopy is a
Serine/threonine-protein kinase ATR, also known as ataxia telangiectasia and Rad3-related protein (ATR) or FRAP-related protein 1 (FRP1), is an enzyme that, in humans, is encoded by the ATR gene. [5] [6] It is a large kinase of about 301.66 kDa. [7] ATR belongs to the phosphatidylinositol 3-kinase-related kinase protein family.
Vibrational spectroscopy in the terahertz (THz) frequency range, 0.1–10 THz, is a fast emerging technique for fingerprinting biological molecules and species. For more than 20 years, theoretical studies predicted multiple resonances in absorption (or transmission) spectra of biological molecules in this range.
This difficulty can alternatively be overcome by using an attenuated total reflectance (ATR) device rather than transmission. In the near-infrared range liquid water has absorption bands around 1950 nm (5128 cm −1), 1450 nm (6896 cm −1), 1200 nm (8333 cm −1) and 970 nm, (10300 cm −1).
nano-FTIR absorption and far-field FTIR (ATR modality) spectra measured on the same polymer sample show great agreement. Placement of the sample stage into one of the interferometer's arms (instead of outside of the interferometer as typically implemented in conventional FTIR) is a key element of nano-FTIR.
There are two main approaches to two-dimensional spectroscopy, the Fourier-transform method, in which the data is collected in the time-domain and then Fourier-transformed to obtain a frequency-frequency 2D correlation spectrum, and the frequency domain approach in which all the data is collected directly in the frequency domain.