Damage-Free Nanoscale Isotopic Analysis of Biological Materials with Vibrational Electron Spectroscopy

1. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA. 2. Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA. 3. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA. 4. Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA. 5. Nion R&D, Kirkland, WA, USA. * Corresponding author: hachtelja@ornl.gov