Question

What is Fourier Transform Infrared Spectoscopy (FTIR) and how dose it work?

What is Attenuated Total Reflection (ATR) and how does it work?

please give me the answer about this in details with your OWN WORDS! Thank you :)

Answer 1

Fourier Transform Infrared Spectoscopy is a technique used to obtain an infraed spectrum of absorption or emission of a gas, liquid or solid, which collects high spectral resolution data over a spectral range that confers measures intensity over a narrow range of wavelengths at a time. IN EASIER WORDS you can obtain the absorption or emission of sample matter by infrared spectoscopy, and the machine will give you a convertion of the values using Fourier Transform as a mathematic method for the interferogram obtain by the superposition of both beam light. The fundament of the method is the Michelson interferometer that is generated by making measurements of the signal at many discrete positions of the moving mirror.

Attenuated total reflection is a technique used to determine the infrared spectroscopy a sample in liquid or solid state without a special preparation The way it function:

1)  A beam of infrared light is passed through the ATR crystal in such a way that it reflects at least once off the internal surface in contact with the sample.

2) The reflection forms the evanescent wave which extends into the sample (0.5 to 2micrometres).

3) The beam is then collected by a detector as it exits the crystal.