Ronchigram Explained

Ronchigram (after Italian physicist Vasco Ronchi [ˈroŋki]^{[1] [2]}) is the convergent beam diffraction pattern^[3] of a known object with features comparable to the diffracting wavelength. In the case of electron Ronchigrams amorphous materials are used. The structure of the Ronchigram encodes information about the aberration phase field across the objective aperture.^[4] As such, Ronchigrams have become increasingly important with the invention of aberration corrected scanning transmission electron microscopy.^[5]

External links

• ronchigram.com Web simulator for generating Ronchigrams.

Notes and References

1. Ronchi . Vasco . 1964-04-01 . Forty Years of History of a Grating Interferometer . Applied Optics . EN . 3 . 4 . 437–451 . 10.1364/AO.3.000437 . 2155-3165.
2. Ronchi . Vasco . 1923-07-01 . Due nuovi metodi per lo studio delle superficie e dei sistemi ottici . Il Nuovo Cimento (1911-1923) . it . 26 . 1 . 69–71 . 10.1007/BF02959347 . 122620904 . 1827-6121.
3. Kossel . W. . Möllenstedt . G. . Elektroneninterferenzen im konvergenten Bündel . Annalen der Physik . Wiley . 428 . 2 . 1939 . 0003-3804 . 10.1002/andp.19394280204 . 113–140 . de.
4. Book: Kirkland, Earl J. . Advanced Computing in Electron Microscopy . Springer US . Boston, MA . 2010 . 978-1-4419-6532-5 . 10.1007/978-1-4419-6533-2. 62171402 .
5. Schnitzer . N. . Sung . S.H. . Hovden . R.H. . Introduction to the Ronchigram and its Calculation with Ronchigram . Microscopy Today . 3 . 2019 . 3 . 12–15 . 10.1017/S1551929519000427 . 155224415 . free .