Scattering Summary

∂α/∂q

Polarisability

Scattering Theory Quantum Picture

Raman

●---●

Rotational Raman Spectroscopy

http://www.grc.nasa.gov/WWW/RT/2006/RT/RTB-nguyen3.html

-iħ ∂/∂q

Schrödinger Recipe

H = ½ω(p2 + q2)

The Harmonic Oscillator QM

αα

βα ββ

αβ

Spin

Double monochromater

Example

[p,q] = iħ

So p the momentum and q the coordinate of a quantum system may not be measured precisely simultanoesly

From this we deduce Heisenberg’s Uncertainty Principle

∆p∆q ~ ħ

and

∆E∆t ~ ħ

Which indicates that we can measure the energy of a molecule but when it had that energy