Damage-Free Nanoscale Isotopic Analysis of Biological Materials with Vibrational Electron Spectroscopy. (August 2019) - Hachtel, Jordan A.; Huang, Jingsong; Popovs, Ilja; Jansone-Popova, Santa; Keum, Jong K.; Jakowski, Jacek; Lovejoy, Tracy C.; Dellby, Niklas; Krivanek, Ondrej L.; Idrobo, Juan Carlos