Software Cs-Corrector

IWFR

I terative W ave F unction R econstruction

DigitalMicrograph Plug-in for
Exit Wave Reconstruction

The IWFR works with a through focal series of HREM images to reconstruct a wave function at the specimen exit surface. The IWFR is a kind of Gerchberg-Saxton iteration (which originally uses a pair of a measured image intensity and a diffraction intensity to estimate a complex wave function) The IWFR uses a set of image intensities measured in different planes (a through-focal series), and reconstructs the complex wave at the specimen exit surface (at the zero-defocus plane). You should note that this method requires few images, as few as five (5) will suffice.

Using the obtained wave function you can correct optical aberrations such as spherical aberration. Therefore, the IWFR is a software Cs-corrector. The IWFR software consists of a suite of scripts and a Plug-In for use in DigitalMicrograph for Windows (Gatan Inc).