![]() ![]() Some of the infrared radiation is absorbed by the sample and some of it is passed through. But imagine if the movable mirror moves away from the beamsplitter, the light beam which strikes the movable mirror will travel a longer distance than the light beam which strikes the stationary mirror. In infrared spectroscopy, IR radiation is passed through a sample. If the distances travelled by two beams are the same which means the distances between two mirrors and the beamsplitter are the same, the situation is defined as zero path difference (ZPD). This makes FTIR microscopy ideal for sample. Each functional group has its own discrete vibrational energy which can be used to identify a molecule through the combination of all of the functional groups. When reflected back by the mirrors, two beams of light recombine with each other at the beamsplitter. FTIR Spectroscopy, Fourier-transform infrared spectroscopy, is concerned with the vibration of molecules. Subsequently, the transmitted light and the reflected light strike the stationary mirror and the movable mirror, respectively. The beamsplitter is designed to transmit half of the light and reflect half of the light. The IR spectral range expands from 14,000 cm-1 to 10 cm-1 and corresponds to vibrational transitions of molecules, therefore an FTIR spectrum contains vibrational information on the sample studied. ![]() One of the mirror is a stationary mirror and another one is a movable mirror. Fourier Transform Infrared (FTIR) is a spectroscopic technique to measure the infrared (IR) absorption spectrum of materials. Schematic of the Michelson interferometerĪ typical Michelson interferometer consists of two perpendicular mirrors and a beamsplitter. ![]()
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