The helium-neon laser in a FTIR has a wavelength of 632.8 nm. The dielectric layer needs to be 167 nm thick fused quartz. Give two advantages of a FTIR over a conventional scanning infrared spectrophotometer. Explain how the FTIR is able to achieve these two advantages. All wavelengths from the light source continuously irradiate the detector.
Resolution is determined by the length of the mirror travel.
Thus 10 cm or travel yields 0.1 cm resolution. All wavelengths are simultaneously hitting the detector. In the time that the signal is obtained at one wavelength in a scanning spectrometer, an FT instrument has acquired the entire spectrum. Be sure to use atomic theory in your explaination. In fluorescence, an electron is promoted to an excited state by an excitation light source and the electron's spin is unchanged When the electron returns to a lower energy state, it gives of light.