Illustration - fluorine knock-on chemistry (IMAGE) University of Toronto Caption An artist's interpretation of the energy barrier that a reagent fluorine atom must cross upon colliding with a fluoromethyl molecule on its way to forming a product as a result of a chemical reaction. Researchers at the University of Toronto observed the 'knock-on' collinear ejection of the reaction product (encircled in blue) in the continuation of the direction of the incoming reagent molecule (encircled in red). Credit Illustration: Lydie Leung Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.