|Application Note of Ultrafast Pump-Probe Spectroscopy (Quantronix)|
|ㆍ작성일: 2011-11-04 (금) 16:25||ㆍ조회: 190|
APPLICATION FOCUS: ULTRAFAST PUMP-PROBE SPECTROSCOPY
Ultrafast pump-probe spectroscopy is a common laser-based technique used by biologists, chemists and physicists to investigate the fundamental properties of matter on a timescale equivalent to electronic, vibrational and rotational energy redistribution with a system.
In this technique, an initial photoexcitation "pump" pulse interacts with the material sample, and a second time-delayed "probe" pulse provides information regarding transient species formed, and changes in steady-state populations as a result of the initial excitation over the specified time delay between the two pulses. The basic laser equipment necessary to do this type of measurement is a femtosecond Ti:Sapphire amplifier. For more involved studies, one or two optical parametric amplifiers are required for extension of the pump and probe to various wavelength regions.
The Quantronix inSpect-TA is a turnkey Transient Absorption Spectroscopy system. In the broadband probe/tunable pump configuration, the entire experimental system is integrated into a single compact enclosure. This includes the pump source (a Palitra-FS optical parametric amplifier capable of tuning from 230-22,000 nm), the probe source (a broadband white light continuum from 450-750 nm, basic version), the delay line (up to 4 ns in the basic system), detector for probe collection and sample space for both solid- and solution-phase differential reflection and absorption measurements. The inSpect-TA accepts a single 800 nm input beam and integrates with Quantronix's inSpect Commander software to provide fully computerized alignment, data acquisition and analysis.
Example data of molecular singlet to triplet relaxation over a time range of 1 ns. The absorptions of both species are clearly observed and correlated with each other.
Click here to read more about the Quantronix inSpect-TA.