Question

QUESTION 2 - Electron Microscopy (12 pts) Below and on the following pages is a series of images and other results from possible electron microscopy instrumentation: SEM, TEM Bright Field, TEM Dark Field, Electron Diffraction, Energy Dispersive Spectroscopy Mark each image with the appropriate label or labels from the list above. Provide a brief reasoning for your answers / What features and/or information did you use to make your decision? A-1 Comment: 500 nm A-2 500 nm

Answer 1

A1: Transmission electron microscopy(TEM) bright field image. In this image mass-thickness contrast is clearly seen.

A2: Transmission electron microscopy dark field image.In this image diffraction contrast is observed. It is kind of complementray image to A1. The things that appeared dark in bright filed image are bright in dark field image and vice versa.

B: Scanning electron microscopy(SEM) image. SEM images appear more bright and smooth. The image is due to backscattered and secondary electrons. Ans majorly gives surface information of the sample.

C:  Scanning electron microscopy image.

D: Energy dispersive spectroscopy image: In this, the sample is mapped for various elements and respective X-rays are analyzed.