Part 2, NMR/MRI-education: Simple spin dynamics explored using the Bloch Simulator

Part 2, NMR/MRI-education: Simple spin dynamics explored using the Bloch Simulator

Teaching and understanding of basic NMR and MRI techniques can be quite challenging. This video illustrates on- and off-resonance dynamics as well as relaxation using the Bloch Simulator that is freely available software made for educational purposes. The software executes directly in a browser from www.drcmr.dk Additional short videos demonstrating example uses are also available.
Video Rating: 5 / 5

A single source femtosecond-millisecond broadband spectrometer

A single source femtosecond-millisecond broadband spectrometer EC Carroll, MP Hill, D. Madsen, KR Malley, and DS Larsena Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, USA Time-resolved measurement of population dynamics extending over femtosecond to millisecond time scales typically requires a combination of transient absorption techniques involving different laser systems and detection schemes. The spectrometer design presented here facilitates transient absorption measurements over 12 decades with a single ultrafast laser system by picking pump and probe pulses independently from the laser oscillator pulse train. Unamplified pulses seed a photonic crystal fiber to a supercontinuum probe source for spectrally resolved measurements. The utility of the system is demonstrated by measuring triplet state dynamics following photoexcitation of vitamin B6 in aqueous solution. Time-resolved transient absorption TA, or optical pump-probe, spectroscopy has become an indispensable technique for characterizing photoinduced population dynamics in biological, chemical, and solid-state chromophores. Dynamics in such samples often occur over multiple time scales ranging from femtoseconds eg photoisomerization to milliseconds eg protein conformational changes. In a TA experiment, a pulsed light source excites a subpopulation of the sample into an electronic excited state and its relaxation dynamics is subsequently probed by ...
Video Rating: 4 / 5

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