Bubble Chamber (IMAGE) University of Chicago Caption Bell jars in the Chicagoland Observatory for Underground Particle Physics consist of a steel vessel that contains the fire-extinguishing liquid iodotrifluoromethane (CF3I). Scientists would expect to see a weakly interacting massive particle leave a single bubble, like the one at right, when it hits the nucleus of an atom in the CF3I molecule. Other types of charged particles would leave multiple bubbles, like the ones at left. Credit Fermilab Usage Restrictions News organizations may use this image in connection with reports about the work of Juan Collar and his colleagues. 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.