Tuesday, October 4, 2011

Light Spectroscopy

CD-stpectroscopy

Circular dichroism

Circular dichroism (CD) refers to the differential absorption of left and right circularly polarized light (wikipedia)
Circularly polarized light, For left circularly polarized light (LCP) with propagation towards the observer, the electric vector rotates counterclockwise.[2] For right circularly polarized light (RCP), the electric vector rotates clockwise. 
The absorption differential of media between LCP and RCP defines CD-spectroscopy.
Circular dichroism (CD) spectroscopy measures differences in the absorption of left-handed polarized light versus right-handed polarized light which arise due to structural asymmetry. The absence of regular structure results in zero CD intensity, while an ordered structure results in a spectrum which can contain both positive and negative signals. 

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