How do I calculate as I remember rxd=lx wavelength
as I have to choose r as diameter or radius from center ? and that camera constant value?. Please explain
A more focused image you can definitely get.
See answers to similar questions on RG:
https://www.researchgate.net/post/What_is_the_information_obtained_from_SAED_pattern_of_nanopoarticles
https://www.researchgate.net/post/How_can_I_calculate_the_d-spacing_between_planes_of_rutile_to_compare_with_my_selected_area_diffraction_image
https://www.researchgate.net/post/How_can_I_calculate_the_d-spacing_between_planes_of_rutile_to_compare_with_my_selected_area_diffraction_image
https://www.researchgate.net/post/How_do_we_calculate_d-spaces_from_SAED_pattern
https://www.researchgate.net/post/How_do_we_calculate_d-spaces_from_SAED_pattern/1
When collecting a diffraction pattern it's best to spread the beam (brightness) out as much as possible and then focus the pattern using diffraction focus. This will improve your diffraction patterns considerably.
In answer to your question; when collecting your diffraction pattern it is up to you to set the camera length. The software will generally store in the image (digital micrograph) what the camera length was and assign a scale bar to the diffraction pattern. The diffraction pattern is in Fourier space so if you measure the distance between the centre out to the rings this will give the inverted distance to each plane. To find out what the plane spacing is in Real space simply use d = 1/radius. This is all assuming that your microscope has been properly calibrated against standards at various camera lengths to ensure the software scaling is correct.
Hope this helps.
Sir Kenneth M Towe
Its a mixed phase anatase and monoclinic system and yes its poorly crystallined sample but my problem is how to distinguish overlapping d-spacing of two systems
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