BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Tim Gay\, University of Nebraska\n\n
We have bombarded chiral halocamphor molecules in the gas phase with low-energy (<\; 1 eV)\, lon gitudinally-spin-polarized electrons\, and investigated dissociative elect ron attachment (DEA) reactions:
\n\ne- + HA &rarr\; H- + A\,
\n\nwhere H is a halogen atom (Br or I) and A is the residual camphor fragm ent. \; 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 ef fect can be as large as two parts in 1000. \; The observation of chira l sensitivity in a break-up reaction is important because\, among other th ings\, it validates the premise of the Vester-Ulbricht hypothesis regardin g the origins of biological homochirality. \; The sordid history of pr evious attempts to demonstrate such effects will be briefly reviewed.
\ n DTSTART:20160826T193000Z LOCATION:Physics Building\, Room 204 SUMMARY:Electron Circular Dichroism and the Origin of Life On Earth END:VEVENT END:VCALENDAR