Advanced Spectroscopy Techniques
Explore advanced spectroscopy techniques such as third-order spectroscopy, transient grating, pump-probe methods, coherence, and more in this detailed presentation by Andrei Tokmakoff from MIT Department of Chemistry. Learn about nonlinear spectroscopy applications and principles in the field of chemistry.
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Presentation Transcript
Nonlinear Spectroscopy: Third Order Spectroscopy Andrei Tokmakoff MIT Department of Chemistry 2009
3rd-order spectroscopy in box geometry k sig sample bk ak top-down view = + + k k k k ck sig a b c k c sig + ck bk a b + ak
3rd-order spectroscopy in box geometry NR E E 1 sample 2 E k sig 3 + 3k 2k + 1k R = + + NR sig = + + R k k k k k k k k 1 2 3 1 2 3 sig k sig R NR + 3k 3 1 2 1k + 2k
Transient grating ( ) 2 I P sig Population relaxation ( ) + exp exp 2 2 I sig bb aa Acoustic waves Thermal diffusion ( ) exp 2 2 I D sig
Coherence and wavepackets in pump-probe 1 R R 2 E 2 c a d b 3 2 E a a a a 1 E d d b b c c a a i i e e 2 2 2 2 ca ca db db Quantum Beats ( ) I Population Relaxation e 2 bb
CARS (coherent anti-Stokes Raman scattering)
