New Spectroscopy Methods (IMAGE) University of Würzburg Caption Laser pulse sequences (u.l.) cause 2D spectra (u.r.): In EEI2D spectroscopy (b.l.), two originally separate excitations meet. With 2D mass spectrometry (r.), ion photoproducts are detected. Credit (Graphic: Tobias Brixner, JMU) 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.