Electron microscope

In exercise 1, experiment A, the students will need a microscope slide, a coverslip, a compound microscope, carmine powder, distilled water, and a pipette. The students will begin by placing a drop of water on the microscope slide. Then they will add carmine powder onto the slide. Then they will place a coverslip on top of the solution. This will aid in mixing the solution. Then the students will observe the movement of the carmine particles on low power and high power. In exercise 1,…

water under the microscope. Taking note of their size, movements, and characteristics to classify the different types of protists from applying previous knowledge of protists. Materials: The materials in this lab that will be needed are a microscope, slide, coverslips, a pipette, and a dish of pond water. Procedure: Prepare a slide by using the pipette to apply two drops of pond water on a slide and properly place a coverslip. Place the prepared slide under the microscope to view and…

SEM is a kind of microscope to observe the topography of materials. SEM has some advantages: it has a large depth of field and we can observe the 3D image of the sample and analyzing its topography, its magnification range is widely and we could make sample easily because of the X-ray spectrometry, which can determine the elements of sample. When electron beam attack the sample, incident electron will be diffracted and change the direction or even loose some energy. During this process,…

produces a largely magnified image by using electrons instead of light to form an image. A beam of electrons is produced at the top of the microscope by an electron gun. It consists of an electron gun to produce high energy electron beam. A magnetic condensing lens is used to condense the electron beam and a scanning coil is arranged in-between magnetic condensing lens and the sample. The electron detector (Scintillator) is used to collect the secondary electrons and can be converted into…

The problem with synthesizing this molecule is that it contains unpaired electrons in two of its outer carbons. These free electrons cause the molecule to oxidize almost instantly as these electrons react to try to find stability. The researcher team form IBM has found a way to overcome this obstacle. By starting with the molecule dihydrotriangulene, triangulene with a hydrogen attached to each of the unpaired electrons. The researchers were able…

An electron vacancy is created and is further filled by an electron from the higher shell and thus an X-ray is emitted to balance the difference in energy between the two electrons. The detector placed on the energy dispersive spectroscope apparatus measures the number of emitted X-rays and their energies. Energy of the X-ray is characteristics of the element from which X-ray is emitted. A spectrum of the relative counts of the detected X-rays is obtained and evaluated for quantitative…

However, TiO2 is only sensitive to UV light region, because of its large band gap (~3.2 eV) [13], and fast recombination of electron/hole pair limits its photocatalytic reaction process [14]. Many attempts have been devoted to develop high-performance TiO2 photocatalysts for practical applications such as core–shell structure [15] nonmetal or metal doping [16–19], phase mixing…

pulse) enters the microscope, and together with the ultrafast electron pulses illuminate the nanostructure specimen (gold nanoparticle). The visible laser pulse kept at low power (~1.8 mJ/cm2) to avoid saturation. At the spatiotemporal overlapping, the coupling between the visible and electron pulses takes place. The signature of this coupling can be revealed by measuring the electron energy spectrum using the electron energy spectrometer attached to the microscope. The measured electron…

semiconductor material. This P-N junction is a connection of a p-doped (electron-hole-doped) semiconductor material and n-doped (electron-doped) semiconductor material. When electric current through this junction is present, the electrons participating in the electric current are of an elevated energy state and propagate in the conduction energy band. The conduction energy band exists at a higher energy than the valence band, which is where electrons occupy the valence states of an atom. In an…

Atoms are the most basic building blocks, everything around us are made out of atoms. Atoms are so small that it can’t be found under the finest microscopes. A tiny spec of dust contains millions of billions of atoms! Even though atoms are tiny, but it actually consist of three different particles: protons, neutrons, and electrons. In every atom, electrons move around the nucleus, the combination of protons and neutrons. The idea of an atom was first discovered by the ancient Greeks, they…