What is the principle of IR spectroscopy Slideshare?
PRINCIPLE OF IR SPECTROSCOPY When the energy in the form of IR is applied and if the applied IR frequency = Natural frequency of vibration, the absorption of IR takes place and a peak is observed.
What is IR spectroscopy instrumentation?
Infrared Spectrometry – Instrumentation An infrared spectrophotometer is an instrument that passes infrared light through an organic molecule and produces a spectrum that contains a plot of the amount of light transmitted on the vertical axis against the wavelength of infrared radiation on the horizontal axis.
What does the IR instrument measure?
It is used by chemists to determine functional groups in molecules. IR Spectroscopy measures the vibrations of atoms, and based on this it is possible to determine the functional groups. 5 Generally, stronger bonds and light atoms will vibrate at a high stretching frequency (wavenumber).
What is the principle and instrumentation of IR spectroscopy?
The IR spectroscopy theory utilizes the concept that molecules tend to absorb specific frequencies of light that are characteristic of the corresponding structure of the molecules. The energies are reliant on the shape of the molecular surfaces, the associated vibronic coupling, and the mass corresponding to the atoms.
Why is KBr used for IR?
KBr is used as a carrier for the sample in IR spectrum and it is optically transparent for the light in the range of IR measurement. So that no interference in absorbence would occur. KBr, has a transmittance of 100 % in the range of wave number (4000-400 cm-1). Therefore, it does not exhibit absorption in this range .
What are the three types of IR vibrations?
The infrared portion of the electromagnetic spectrum is usually divided into three regions; the near-, mid- and far- infrared, named for their relation to the visible spectrum. The higher energy near-IR, approximately 14000-4000 cm-1 (0.8-2.5 μm wavelength) can excite overtone or harmonic vibrations.
What is IR spectroscopy PPT?
Infrared spectroscopy (IR spectroscopy) is the spectroscopy that deals with the infrared region of the electromagnetic spectrum, that is light with a longer wavelength and lower frequency than visible light Infrared Spectroscopy is the analysis of infrared light interacting with a molecule.
Which lamp is used in IR spectroscopy?
A Globar is used as thermal light source for infrared spectroscopy. It is a silicon carbide rod of 5 to 10 mm width and 20 to 50 mm length which is electrically heated up to 1,000 to 1,650 °C (1,830 to 3,000 °F).
What is the principle of IR spectroscopy and its application?
What are the objectives of IR spectroscopy?
Simply, it is the absorption measurement of different IR frequencies by a sample positioned in the path of an IR beam. The main goal of IR spectroscopic analysis is to determine the chemical functional groups in the sample. Different functional groups absorb characteristic frequencies of IR radiation.