Tracking intramolecular energy redistribution dynamics in aryl halides: the effect of halide mass.Selective excitation of C-H, C-C, CX1 and CX2 stretching vibrational modes in an orderly manner, detection of intramolecular energy redistribution and vibrational coupling in the electronic ground state of aryl halides are performed by time- and frequency-resolved Coherent Anti-Stokes Raman Scattering (CARS) spectroscopy. 
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