What is a near-infrared correlation chart used for?

Near-infrared spectroscopy is used in astronomy for studying the atmospheres of cool stars where molecules can form. The vibrational and rotational signatures of molecules such as titanium oxide, cyanide, and carbon monoxide can be seen in this wavelength range and can give a clue towards the star’s spectral type.

What does NIR measure?

NIR spectroscopy measures light that is scattered off and through sample material, and this can rapidly determine the material’s properties. This process has no effect on the material itself.

What do IR peaks mean?

Basically IR peaks are the result of dipole radiation interactions for a compound, and stronger IR peak indicates stronger coupling between the light source and the dipole effect in the compound being studied.

What is NIR I range?

Near-infrared light generally refers to light within the wavenumber range of 12,500 to 4,000 cm-1 (wavelengths from 800 to 2,500 nm) (see Fig. 1).

What are NIR wavelengths?

Near Infrared (NIR) is a subset of the infrared band of the electromagnetic spectrum, covering the wavelengths ranging from 0.7 to 1.4 microns. This wavelength is just outside the range of what humans can see and can sometimes offers clearer details than what is achievable with visible light imaging.

How do you explain an IR spectrum?

Infrared Spectroscopy is the analysis of infrared light interacting with a molecule. This can be analyzed in three ways by measuring absorption, emission and reflection. The main use of this technique is in organic and inorganic chemistry. It is used by chemists to determine functional groups in molecules.

What is infrared spectroscopy correlation table?

Infrared spectroscopy correlation table. An infrared spectroscopy correlation table (or table of infrared absorption frequencies) is a list of absorption peaks and frequencies, typically reported in wavenumber, for common types of molecular bonds and functional groups.

Why are NIR spectra more complicated than other spectra?

Although NIR spectra are more complicated it is possible to make some general observations. As a fundamental O–H stretching absorption is different to a fundamental C–H stretch then the series of overtones generated by these absorptions will also be different. The same goes for combination bands.

Is the NIR spectrum of chloroform dominated by hydrogen?

Figure 2 is an NIR spectrum of chloroform, CHCl 3, the molecule contains only one hydrogen atom but all the absorption in its spectrum are caused by this single atom. Figure 2. The NIR spectrum of chloroform. It is an important generalisation that NIR spectroscopy is dominated by hydrogen.

What is absorption in the NIR region?

Absorptions in the NIR region (780–2500 nm) are generated from fundamental vibrations by two processes; overtones and combinations. Overtones can be thought of as harmonics.