Principles Of - Nonlinear Optical Spectroscopy A Practical Approach Or Mukamel For Dummies Fixed

In linear spectroscopy (absorption), you poke once, the polarization wiggles, and you measure the wiggle decay. Boring.

| | What it means practically | Mukamel term to ignore | | --- | --- | --- | | Exponential decay of echo vs ( t_1 ) | Homogeneous broadening (fast dephasing) | ( T_2^* ) vs ( T_2 ) confusion | | Nonexponential decay (blip at zero delay) | Inhomogeneous broadening (ensemble disorder) | Spectral diffusion function | | Oscillations in 2D spectrum along ( t_1 ) | Quantum beats between coupled states | Coherent artifact from ( \rho_eg^(1) ) | | Diagonal elongation in 2D spectrum | Strong coupling (exciton delocalization) | Redfield relaxation tensor | | Cross-peak appears only after ( t_2 > 0 ) | Energy transfer | Forster rate ( k_ET ) | In linear spectroscopy (absorption), you poke once, the

[ k_signal = -k_1 + k_2 + k_3 ]

A laser pulse hits your molecule. The electric field pushes the electrons around. Your molecule gets a temporary dipole moment. This is called polarization (P) . The electric field pushes the electrons around

Ignoring the rotating wave approximation (RWA). Fix: The RWA means you drop terms that oscillate at optical frequencies (they average to zero). Without RWA, you will cry. With RWA, you get simple exponentials. Ignoring the rotating wave approximation (RWA)