ColloquiaAll colloquia are held in the Cunniff lecture hall, which is room 199 of the Science Center. Wednesday colloquia begin at 4:30 p.m. Refreshments are served at 4:00 p.m. just outside the hall. There are also some lunchtime colloquia held on Fridays. For questions regarding the speakers and topics, please contact Prof. Peter Collings (pcollin1 at swarthmore dot edu) at (610) 328-7790. Useful links
Dynamics on the Nanoscale: Light Emission from Single Semiconductor NanorodsCatherine Crouch, Department of Physics and Astronomy, Swarthmore CollegeFriday, February 22, 12:50 PM How do single quantum objects, such as molecules and semiconductor nanoparticles, emit light? One intriguing feature of the fluorescence observed from a wide variety of single fluorophores is intermittency, colloquially called “blinking”. Under steady excitation, single fluorophores do not emit light steadily, but turn on and off, remaining on or off for milliseconds to minutes at a time. Intermittency is fairly well understood in many molecular systems, but it is still poorly understood in semiconductor nanocrystals, tiny crystalline particles of a semiconductor such as cadmium selenide that are only a few nanometers across. Such nanocrystals are the subject of extensive study, both for the prospect of optoelectronic applications and for the fundamental physics of light emission from quantum particles. This talk will introduce the general field of single-nanocrystal fluorescence and present our results on fluorescence intermittency in single rod-shaped nanocrystals. More information on Professor Crouch's research can be found on her website. The COMPLETE View of Star FormationAlyssa Goodman, Harvard-Smithsonian Center for AstrophysicsDate TBA Abstract coming soon. More information on Professor Goodman's COMPLETE survey can be found on the project website.
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