The SEM is an instrument that produces a largely enlarged image by using electrons instead of light to form an image. An electron gun produces an electron beam at the top of the microscope. The electron beam follows a vertical path through the microscope, which is kept inside the vacuum. The scanning electron microscope (SEM) produces images by scanning the sample with a high-energy electron beam.
As electrons interact with the sample, they produce secondary electrons, backscattered electrons, and characteristic X-rays. These signals are collected by one or more detectors to form images that are then displayed on the computer screen. When the electron beam hits the surface of the sample, it penetrates it to a depth of a few microns, depending on the accelerating voltage and the density of the sample. Many signals, such as secondary electrons and X-rays, are produced as a result of this interaction within the sample.
What exactly is search engine marketing (SEM)? The answer has evolved over time and can therefore be a bit murky. SEM used to cover both paid search and search engine optimization (SEO). But the definition now predominantly refers to paid searches. Scanning electron microscopy, or SEM, produces detailed, enlarged images of an object by scanning its surface to create a high-resolution image.
To explain user intent and how you should plan your SEM campaigns around it, let's take the example of a fictitious company called “Pretty Pages”. The chapter will also explain the process of setting up Google and Display search network advertising campaigns, and will show what metrics and reports you should track in your Google Analytics account to gather valuable AdWords data.