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Question 1: Some TEMS are equipped with a flexible objective lens in which the polepieces can be exchanged. A TEM operating at 300 kV has two polepieces with spherical aberration coefficients of 0.45 and 0.20 mm. a) What is the optimum collection angle and resolution of the microscope in these two polepieces? (4) b) The chromatic aberration coefficient is often similar in value to the spherical aberration coefficient. At the optimum collection angles, compare the blurring due to chromatic and spherical aberration. Assume the energy spread of the electron source is 2 eV. (4)

Question 1: Some TEMS are equipped with a flexible objective lens in which the polepieces can be exchanged. A TEM operating at 300 kV has two polepieces with spherical aberration coefficients of 0.45 and 0.20 mm. a) What is the optimum collection angle and resolution of the microscope in these two polepieces? (4) b) The chromatic aberration coefficient is often similar in value to the spherical aberration coefficient. At the optimum collection angles, compare the blurring due to chromatic and spherical aberration. Assume the energy spread of the electron source is 2 eV. (4)

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Question 1: Some TEMS are equipped with a flexible objective lens in which the polepieces can be exchanged. A TEM operating at 300 kV has two polepieces with spherical aberration coefficients of 0.45 and 0.20 mm. a) What is the optimum collection angle and resolution of the microscope in these two polepieces? (4) b) The chromatic aberration coefficient is often similar in value to the spherical aberration coefficient. At the optimum collection angles, compare the blurring due to chromatic and spherical aberration. Assume the energy spread of the electron source is 2 eV. (4)
Transcribed Image Text:Question 1: Some TEMS are equipped with a flexible objective lens in which the polepieces can be exchanged. A TEM operating at 300 kV has two polepieces with spherical aberration coefficients of 0.45 and 0.20 mm. a) What is the optimum collection angle and resolution of the microscope in these two polepieces? (4) b) The chromatic aberration coefficient is often similar in value to the spherical aberration coefficient. At the optimum collection angles, compare the blurring due to chromatic and spherical aberration. Assume the energy spread of the electron source is 2 eV. (4)
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