From e05f0f45a55c0c4b8865e50421b2a1707aa83edb Mon Sep 17 00:00:00 2001 From: skoupy_r Date: Fri, 15 Mar 2024 17:22:53 +0100 Subject: [PATCH] Update Calibrations --- Calibrations.md | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/Calibrations.md b/Calibrations.md index b252384..0ba5020 100644 --- a/Calibrations.md +++ b/Calibrations.md @@ -1,3 +1,5 @@ -Step size - magnification calibration +##### Scanning step correction +Scanning step size is given by magnification and number of scanning points giving together field of view. In reality, original calibration may not be perfectly accurate and own re-calibration may be needed. Scanning step calibration is based on known inter-atomic distance. In our case \ce{SmB6} in [110] orientation where \ce{Sm} to \ce{Sm} distance is 2.92 or 4.13 \AA respectively. Line of 23 \ce{Sm} atoms was imaged in 499 pixels, 1 pixel is $22 \cdot 2.92 / 499 = 0.1287$ \AA. Microscope field of view at 30e6 magnification is 7.154 nm here divided into 512 pixels (pixel 0.1397 \AA). Correction factor between real and nominal pixel size is then $0.1287/0.1397 = 0.9212 = 92.12\% $ -![calib-step](uploads/311e011f544aa091991f8a591ce8f02e/calib-step.PNG) \ No newline at end of file +![calib-step](uploads/311e011f544aa091991f8a591ce8f02e/calib-step.PNG) +Pixel size calibration on \ce{SmB6} sample. Known \ce{Sm} to \ce{Sm} distance (2.92 \AA) is recalculated into real pixel size. Line profile is computed as sum of 7 rows to suppress image noise. \ No newline at end of file