Hyper Rayleigh Scattering

Hyper Rayleigh Scattering (aka Harmonic Light Scattering) is one method for measuring β.

Overview

Schematic of the HRS setup. CL = collimating lenses; LPF = long-pass filter; FL = 300-mm focusing lens; S = solution of chromophore in solvent of choice; DO = detection optics; IF = interference filter (950 nm)

An incident laser generates a second harmonic signal, specifically the frequency double signal. This can be related to the beta of the sample using this formula:

<math>\frac {I_{sample}} {I_{solvent}} = \frac {N_{sample} \langle \beta^2 _{sample} \rangle + N_{solvent} \langle \beta^2_{solvent}\rangle} {N_{solvent} \langle \beta^2_{solvent}\rangle}\,\!</math>

HRS spectrum for 1.5 μm TCP1 in CHCl₃

See Firestone 2004 .

See Wikipedia on Rayleigh Scattering

See also Density Functional Theory

Technique

Video to come