دانلود گزارش کارورزی و کار آموزی

چکیده : 

Nonlinear laser spectroscopies in the deep UV spectral range are motivated by studies of biological systems

and elementary processes in small molecules. This perspective article discusses recent technical

advances in this area with a particular emphasis on diffractive optic based approaches to four-wave mixing

spectroscopies. Applications to two classes of systems illustrate present experimental capabilities.

First, experiments on DNA components at cryogenic temperatures are used to uncover features of excited

state potential energy surfaces and vibrational cooling mechanisms. Second, sub-200 fs internal conversion

processes and coherent wavepacket motions are investigated in cyclohexadiene and a-terpinene.

Finally, we propose new experimental directions that combine methods for producing few-cycle UV laser

pulses in noble gases with incoherent detection methods (e.g., photoionization) in experiments with time

resolution near a singlefemtosecond. These measurements are motivated by knowledge of extremely fast

non-adiabatic dynamics and the resolution of electronic wavepacket motions in molecules.