Effect of sample tilt on PEEM resolution

0385323 - ÚPT 2013 RIV NL eng J - Journal Article
Oral, Martin - Radlička, Tomáš - Lencová, B.
Effect of sample tilt on PEEM resolution.
Ultramicroscopy. Roč. 119, S1 (2012), s. 45-50. ISSN 0304-3991. E-ISSN 1879-2723
R&D Projects: GA AV ČR IAA100650805
Institutional support: RVO:68081731
Keywords : PEEM * LEEM * Aberrations * Misalignment * Sample tilt * Point spread function * Resolution
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 2.470, year: 2012

In electron microscopy design, the systems are usually assumed to be perfectly aligned or that possible small imperfections can be eliminated by simple multipole correctors (centering deflectors, stigmators) without loss of resolution. However, in some cases, like in the cathode lens between the sample and the objective lens in the photoemission electron microscope, even a small imperfection can impair the resolution significantly. Because of the strong field between the sample and the objective lens, even a small tilt of the sample generates a parasitic dipole field, which decreases resolution and causes image deformations. We present a simulation of the influence of a small sample tilt on the system resolution based on modern computational methods that enable simulation of the whole system including the parasitic fields, proper setting of centering deflectors and stigmators. The resolution is determined by simulating the point spread function and finding the size of its significant part. The procedure is shown on realistic data from the literature. We found out that the resolution becomes worse mainly in the direction of the parasitic dipole field.
Permanent Link: http://hdl.handle.net/11104/0214610