nonlinear spectroscopy

nonlinear spectroscopy

[′nän‚lin·ē·ər spek′träs·kə·pē]
(spectroscopy)
The study of energy levels not normally accessible with optical spectroscopy, through the use of nonlinear effects such as multiphoton absorption and ionization.
References in periodicals archive ?
in nonlinear microscopy of living cells, or nonlinear spectroscopy of com-bustion processes).
Another 27 studies consider such topics as fluctuations and relaxation dynamics of liquid water revealed by linear and nonlinear spectroscopy, charge transport at the metal-organic interface, ultrafast photochemistry in liquids, single-molecule fluorescence imaging in living cells, dynamic nuclear polarization methods in solids and solutions to explore membrane proteins and membrane systems, and molecular switches and motors on surfaces.
The combination of classical TR acoustics and nonlinear spectroscopy brings about a significant enhancement of imaging localized areas of microdamage and is one of the only techniques known today to discriminate between a linear (void) and a nonlinear scatterer (crack).
Other topics covered include dynamics of light harvesting in photosynthesis, quantum coherent control for nonlinear spectroscopy and microscopy, chirality in nonlinear optics, and active biological materials.
For the uninitiated, Cina explains wavepacket interferometry as "a form of nonlinear spectroscopy using sequences of ultrashort pulses with specified optical phase relationships, to gain direct experimental information at the level of time-dependent quantum mechanical wave functions.
Experimental methods and instrumentation are described with topics ranging from the most widely used methods (electronic and vibrational CD) to frontier areas such as nonlinear spectroscopy and photoelectron CD, as well as the theory of chiroptical methods and techniques for simulating chiroptical properties.

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