[Jlab-seminars] Today's Physics Seminar: Timothy Gay; Electron Circular Dichroism and the Origin of Life On Earth

[Stephanie Tysor]

*Physics Seminar*

*Timothy Gay*

*Department of Physics and Astronomy University of Nebraska*

*Electron Circular Dichroism and the Origin of Life On Earth*

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*Abstract:*

We have bombarded chiral halocamphor molecules in the gas phase with 
low-energy (< 1 eV), longitudinally-spin-polarized electrons, and 
investigated dissociative electron attachment (DEA) reactions:

e^- + HA → H^- + A,

where H is a halogen atom (Br or I) and A is the residual camphor 
fragment.We observe that for a given target handedness, the total DEA 
cross section depends on the helicity of the incident electron.In the 
case of iodocamphor at the lowest incident electron energies, this 
effect can be as large as two parts in 1000.The observation of chiral 
sensitivity in a break-up reaction is important because, among other 
things, it validates the premise of the Vester-Ulbricht hypothesis 
regarding the origins of biological homochirality.The sordid history of 
previous attempts to demonstrate such effects will be briefly reviewed.

*Thursday, August 25, 2016*

*11:00am*

*CEBAF Auditorium*

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