Credit: Carlos Baiz/University of Chicago
The optical layout of the infrared microscope used to carry out the experiments (left). Micrograph and chemical map of a single polystyrene microbead embedded with a marker molecule, Mn2(CO)10 (center). Ultrafast two-dimensional infrared spectrum of the marker molecule inside the bead (right). The amplitude and shape of the two-dimensional peaks is used to map the concentration and chemical environment of the marker species at different locations in the sample.