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Title: Identification of site-specific isotopic labels by vibrational spectroscopy in the electron microscope

Journal Article · · Science

The identification of isotopic labels by conventional macroscopic techniques lacks spatial resolution and requires relatively large quantities of material for measurements. We recorded the vibrational spectra of an α amino acid, l -alanine, with damage-free “aloof” electron energy-loss spectroscopy in a scanning transmission electron microscope to directly resolve carbon-site–specific isotopic labels in real space with nanoscale spatial resolution. An isotopic red shift of 4.8 ± 0.4 milli–electron volts in C–O asymmetric stretching modes was observed for 13 C-labeled l -alanine at the carboxylate carbon site, which was confirmed by macroscopic infrared spectroscopy and theoretical calculations. The accurate measurement of this shift opens the door to nondestructive, site-specific, spatially resolved identification of isotopically labeled molecules with the electron microscope.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1528642
Alternate ID(s):
OSTI ID: 1493991
Journal Information:
Science, Journal Name: Science Vol. 363 Journal Issue: 6426; ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 75 works
Citation information provided by
Web of Science

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Cited By (6)

Emerging Electron Microscopy Techniques for Probing Functional Interfaces in Energy Materials journal October 2019
Spectrally tunable infrared plasmonic F,Sn:In 2 O 3 nanocrystal cubes journal January 2020
Far-field midinfrared superresolution imaging and spectroscopy of single high aspect ratio gold nanowires journal January 2020
Polarization Selectivity in Vibrational Electron-Energy-Loss Spectroscopy journal December 2019
Efficient and Versatile Model for Vibrational STEM-EELS journal January 2020
Isotopic compositions, nitrogen functional chemistry, and low‐loss electron spectroscopy of complex organic aggregates at the nanometer scale in the carbonaceous chondrite Renazzo journal October 2019

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