WM 3- Infrared Spectroscopy Flashcards
1
Q
What is IR spectroscopy used for?
A
To provide evidence of a substance in an unidentified mixture
2
Q
What principle does IR spectroscopy rely on?
A
- all molecules absorb IR radiation, cause changes in molecules by vibrational energy
- different molecules absorb different frequencies
3
Q
What is the unit used in IR spectroscopy?
A
Wavenumber=1/wavelength
4
Q
How can diatomic molecules vibrate?
A
By stretching
5
Q
Give some example of how complex molecules can vibrate when IR is absorbed
A
Rocking, bending, scissoring, twisting
6
Q
What is the fingerprint region on IR spectrum?
A
Below 1500cm-1, spectra is difficult to analyse, as peaks are not caused by functional groups
