FTIR - Fourier Transform Infrared Spectroscopy

I. Introduction Fourier Transform Infrared Spectroscopy (FTIR) is a powerful analytical technique. It plays a crucial role in various fields such as chemistry, materials science, and biochemistry.

II. Principle - When infrared radiation interacts with a sample, different chemical bonds absorb specific frequencies of the infrared light. FTIR measures the intensity of the absorbed light as a function of frequency. By using a Fourier transform algorithm, it converts the raw data into a spectrum.

III. Instrumentation - Source: Emits infrared radiation over a broad range of wavelengths, typically an infrared lamp. - Interferometer: Modulates the infrared beam, which is essential for the Fourier transform process. - Sample Compartment: Where the sample is placed. Samples can be in different forms like solids (e.g., pressed into pellets), liquids (between salt plates), or gases. - Detector: Detects the intensity of the infrared radiation after it has passed through the sample.

IV. Applications - Chemical Analysis: Identifies functional groups in organic compounds, helping in the determination of molecular structure. - Quality Control: Ensures the consistency of products by analyzing the chemical composition. - Environmental Monitoring: Detects pollutants and contaminants in air, water, and soil samples.

V. Advantages - High sensitivity, allowing for the detection of trace amounts of substances. - Wide range of applications due to its ability to analyze different types of samples. - Fast analysis time compared to some other spectroscopic techniques.