Study Set Content:
position of the atom changes relative to the original bond axis
Bending (deformation)
generally require less energy and take place at longer wavelength than the corresponding stretching vibrations
Bending vibrations
Provides infrared radiation across a range of frequencies.
IR Source
A reference beam that bypasses the sample, used for baseline correction and normalization.
Reference:
Selects specific wavelengths of infrared light for analysis.
Monochromator:
Where the sample is placed for analysis.
Sample Compartment
Divides the infrared beam into the sample and reference beams
Splitter:
Measures the intensity of infrared light transmitted through or reflected by the sample.
Detector
Displays the spectral data obtained from the detector
Readout:
THREE COMMON TYPES OF INFRARED SPECTROSCOPY
- Dispersive Infrared Spectroscopy (DS)
- Fourier Transform Instruments (FTIR)
- Near Infrared Spectroscopy (NIR)
“Grating or scanning spectrometers”
Dispersive Infrared Spectroscopy (DS)
Which use a monochromator to select each wavenumber in turn in order to monitor its intensity after the radiation has passed through the sample
Dispersive Infrared Spectroscopy (DS)
Key components are the
source, entrance slit, grating (monochromator) and detector.
