Physics307L:People/Lancaster/Notebook/070917
--Michael T. Lancaster 17:29, 17 September 2007 (EDT)Electron Diffraction
Now with the apparatus working we begin to take data.
Erron's measurements
Diameters ( outside first maximum) (outside second maximum) Voltages
(mm) (mm) (kV) 32.30 55.43 3.12 29.76 51.10 3.30 28.55 49.30 3.50 29.10 47.80 3.60 28.63 48.90 3.70 28.60 48.20 3.80 26.60 46.33 3.90 27.20 46.90 4.00 28.00 47.70 4.10 26.90 47.20 4.20 27.10 46.40 4.30 24.80 45.70 4.40 26.20 43.30 4.50 26.00 42.40 4.60 26.50 41.90 4.70 24.10 41.40 4.80 24.10 42.90 4.90 24.20 41.40 5.00
--Michael T. Lancaster 17:29, 17 September 2007 (EDT)
Mike's Measurements
( outside first maximum) (outside second maximum) Voltages
(mm) (mm) (kV)
30.53 53.14 2.9 30.42 53.01 3 29.85 49.4 3.1 29.71 49.23 3.2 28.75 49.05 3.3 28.71 48.32 3.4 27.93 48.95 3.5 28.33 47.92 3.6 28.95 46.83 3.7 26.62 46.42 3.8 26.16 45.65 3.9 25.94 45.37 4.0 25.82 44.97 4.1 24.94 43.25 4.2 23.96 42.22 4.3 23.50 42.70 4.4 23.78 41.32 4.5 23.16 42.27 4.6 22.28 41.89 4.7 22.11 41.69 4.8 21.95 41.16 4.9 21.57 40.55 5.0
Off center aberration
The question was posed whether or not the diameter of the rings would be effected by the position of the center of the rings. To determine how much error there is in this we took several measurements.
On center
inner ring (mm) outer ring (mm) V 1) 30.29 48.3 3.8kV
Off center
inner ring (mm) outer ring (mm) V
1)(18mm) 26.61 47.5 3.8 2)(7.46mm) 27.32 45.07 3.8 3)(11.07mm) 26.61 47.2 3.8 4)(5.03mm) 28.04 48.2 3.8