Beam Rocking Microanalysis
Beam Rocking Microanalysis - Related Videos
01:09
Rolling Without Slipping
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2023
People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is essential...
01:14
Rolling With Slipping
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2025
Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface. An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...
09:30
Focused Ion Beams
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2023
Source: Sina Shahbazmohamadi and Peiman Shahbeigi-Roodposhti-Roodposhti, School of Engineering, University of Connecticut, Storrs, CT As electron microscopes become more complex and widely used in research labs, it becomes more of a necessity to introduce their capabilities. Focused ion beam (FIB) is an instrument that can be employed in order to fabricate, trim, analyze and characterize materials on mico- and nano-scales in a wide variety of fields from nano-electronics to medicine. FIB...
01:30
Beams
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2023
Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition. Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
01:21
Rolling Resistance
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2023
When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures. For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
FAQs
Changing the beam’s incidence angle alters how electrons interact with regularly arranged atomic planes. At particular orientations, electron channeling changes the intensity of characteristic X-rays emitted by the sample. These variations are not simply instrumental fluctuations; they reflect the relationship between the beam direction and the crystal lattice, allowing chemical signals to carry crystallographic information.
A rocking curve records how a characteristic X-ray intensity changes across the controlled angular range. Its pattern can indicate crystal orientation and help identify phases that might produce similar elemental spectra. Interpreting the curve together with the associated elemental signal therefore connects chemical composition with the structural arrangement responsible for the measured response.
Crystal orientation determines how strongly electron channeling influences the beam’s interaction with atomic planes. Two regions with related chemical signals can therefore produce different angle-dependent responses if their structures or orientations differ. Accounting for orientation helps prevent chemical interpretation from being separated from crystallographic context, which is especially important when distinguishing phases in crystalline materials.
The measurement begins by selecting a crystalline region for analysis and recording its elemental X-ray response while the electron beam is tilted through a controlled angular range. The resulting intensity changes are organized as rocking curves. Researchers then compare those curves with elemental spectra to relate signal behavior to phase identity and crystal orientation.
This approach is most useful when composition alone cannot fully distinguish regions within a crystalline sample. It supports studies of minerals, alloys, semiconductors, and other materials in which phase assignment depends on both chemical signals and structural orientation. The combined information can clarify whether similar compositions correspond to the same phase or to distinct crystalline regions.
Researchers compare the angle-dependent X-ray patterns from the regions rather than relying only on their elemental spectra. Differences in rocking-curve behavior may reflect distinct phases or crystallographic orientations, even when the chemical signals appear similar. This combined analysis provides a higher-resolution way to connect local chemistry with the crystal structure of each region.