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Title: Damage-free vibrational spectroscopy of biological materials in the electron microscope

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms10945· OSTI ID:1252902
 [1];  [1];  [2];  [3];  [4];  [5];  [5]; ORCiD logo [3];  [3]
  1. Arizona State Univ., Tempe, AZ (United States)
  2. Univ. Paris-Sud, Orsay (France)
  3. Weizmann Institute of Science, Rehovot (Israel)
  4. Arizona State Univ., Tempe, AZ (United States); Nion Co., Kirkland, WA (United States)
  5. Nion Co., Kirkland, WA (United States)

Vibrational spectroscopy in the electron microscope would be transformative in the study of biological samples, provided that radiation damage could be prevented. However, electron beams typically create high-energy excitations that severely accelerate sample degradation. Here this major difficulty is overcome using an ‘aloof’ electron beam, positioned tens of nanometres away from the sample: high-energy excitations are suppressed, while vibrational modes of energies o1 eV can be ‘safely’ investigated. To demonstrate the potential of aloof spectroscopy, we record electron energy loss spectra from biogenic guanine crystals in their native state, resolving their characteristic C–H, N–H and C=O vibrational signatures with no observable radiation damage. Furthermore, the technique opens up the possibility of non-damaging compositional analyses of organic functional groups, including non-crystalline biological materials, at a spatial resolution of ~10nm, simultaneously combined with imaging in the electron microscope.

Research Organization:
Rutgers Univ., New Brunswick, NJ (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Arizona State University; Universite Paris-Sud, France; Weizmann Institute of Science, Israel; Nion Co., Washington, USA
Grant/Contract Number:
SC0005132
OSTI ID:
1252902
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 96 works
Citation information provided by
Web of Science

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Emerging Electron Microscopy Techniques for Probing Functional Interfaces in Energy Materials journal October 2019
Vibrational spectroscopy at atomic resolution with electron impact scattering journal October 2019
Exploring the capabilities of monochromated electron energy loss spectroscopy in the infrared regime journal April 2018
The influence of surfaces and interfaces on high spatial resolution vibrational EELS from SiO2 journal February 2018
Identification of site-specific isotopic labels by vibrational spectroscopy in the electron microscope journal January 2019
Evaluation of a monochromator with double cylindrical lenses for electron microscopy journal December 2019
Emerging Electron Microscopy Techniques for Probing Functional Interfaces in Energy Materials journal January 2020
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Analytical Electron Microscopy book July 2016
Temperature Measurement by a Nanoscale Electron Probe using Energy Gain and Loss Spectroscopy journal August 2018