Abstract
Richard Feynman pointed out in his 1959 speech, “It would be very easy to make an analysis of any complicated chemical substance; all one would have to do would be to look at it and see where the atoms are… I put this out as a challenge: Is there no way to make the electron microscope more powerful?” Over more than 50 years, with significant achievements in electron microscope and the developments of aberration-corrected electron optics, scanning transmission electron microscopy (STEM) has reached spatial resolution of 0.5 Å. Recently, in combination of the state-of-the-art scanning transmission electron microscope (STEM) and a tomographic reconstruction technique known as equally sloped tomography (EST), we have achieved electron tomography at 2.4 angstrom resolution [ 1 ]. This general method has been applied to reveal almost all atoms inside a Pt nanoparticle with unprecedented details [ 2 ]. Most recently, Feynman's 1959 challenge has been tackled by successfully determining 3D coordinates of 3,769 individual atoms at the tip of a tungsten needle with a precision of ~19 picometers [ 3 ]. In this talk, I will present the achievements of this novel technique.
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