Second harmonic generation is a nonlinear optical process, in which photons interacting with a nonlinear material are effectively "combined" to form new photons with twice the energy, and therefore twice the frequency and half the wavelength of the initial photons. It is a special case of Sum frequency generation.
This technique has been used to study the interface between two mediums, in this work the liquid/air interface. A number of organic compounds have been investigate, determining the surface orientation of the molecoles and the Gibbs free energy of adsorption at the interface.
Produced by Stephen Wilson, 2008
For details on development, please email sw1703@me.com