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Physics Seminar Series

Using Doppler-Free Spectroscopy to Probe Hyperfine Transitions in Rubidium Vapor

presented by Daniel Rosales Girón, C'17

Wednesday, Feb. 22, 7:30 - 8:30pm, Woods Labs 216


Precision in time and spatial resolution are increasingly important for global positioning systems, communications, nanotechnology, and many other areas. Spectroscopy is used not only to better understand the structure of atoms and molecules, but also to create metrology standards for time and space. For example, the second is defined from atomic clocks using the 9,192,631,770 Hz hyperfine transition frequency in atomic cesium, and the meter is defined as the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second. In this talk, I will present methods and results for directly observing the hyperfine transitions in rubidium vapor by means of saturated absorption spectroscopy (also called Doppler-free saturated spectroscopy).


Daniel Rosales Girón, C’17, is a senior at the University of the South pursuing a B.S. degree in Physics and Mathematics. He was born and raised in Tegucigalpa, Honduras, before coming to the United States for his undergraduate education. In Prof. Donev's laboratory at Sewanee, Daniel has been doing experimental and computational research on plasmonic nanostructures and Raman spectroscopy for three years. He has competed twice in the international University Physics Competition, is a member of Sigma Pi Sigma (The Physics Honor Society), and has served as president of the Sewanee chapter of the Society of Physics Students.


For more information: Prof. Eugene Donev (931) 598-3154 | eudonev@sewanee.edu