Advanced Laser Technique (IMAGE) University of Chicago Caption This photograph shows part of the two-dimensional infrared spectroscopy instrument operating in the laboratory of University of Chicago chemistry Chemistry Professor Andrei Tokmakoff. The normally invisible infrared laser beam appears red in this image with the aid of dry ice. Credit Robert Kozloff, University of Chicago Usage Restrictions News organizations may use this image in connection with reports about the research of Andrei Tokmakoff and his associates. 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.