What is IR spectroscopy useful for identifying?
Infrared spectroscopy is a particular technique that can be used to help identify organic (carbon-based) compounds. The troughs in the spectrum are caused by the absorption of infrared frequencies by chemical bonds – often, these are characteristic of particular combinations of atoms, or functional groups.
Which region is mostly used in IR spectroscopy?
The ordinary infrared region 2.5–15 μ (4000–667 cm−1) is of greatest practical use to organic chemists. The region 0.8–2.5 μ (12,500–4000 cm−1) is called the near infrared and the region 15–200 μ (667–50 cm−1) the far infrared.
What is the most useful range of IR?
between 4000 – 670cm-1
The term “infra red” covers the range of the electromagnetic spectrum between 0.78 and 1000 mm. In the context of infra red spectroscopy, wavelength is measured in “wavenumbers”, which have the units cm-1. The most useful I.R. region lies between 4000 – 670cm-1.
How is IR spectroscopy used in forensics?
Because much of the evidence that is left at a crime scene consists of organic compounds, infrared spectroscopy is useful in forensic investigations. Infrared spectroscopy can be used to identify forged or altered documents by shining a beam of infrared light on the document’s ink.
How does IR spectroscopy identify functional groups?
Vibrating bonds in functional groups absorb energy at a frequency that corresponds to the vibrational frequency of the bond. Within a narrow range, each type of bond vibrates at a characteristic wavenumber. This makes infrared spectroscopy useful for identifying functional groups in a molecule.
Which IR region most widely used for qualitative analysis?
The most commonly used is the middle infrared region, since molecules can absorb radiations in this region to induce the vibrational excitation of functional groups. Recently, applications of near infrared spectroscopy have also been developed.
Can IR spectroscopy identify a molecule?
We can use infrared (IR) spectroscopy as a tool to help identify molecules and determine their molecular structure.