Pulse Energy Effects
Pulse Energy Effects - Related Videos
02:11
Effects of Temperature on Free Energy
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2020
The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered: The spontaneity of a process, as reflected in the...
08:53
Dependence of Laser-induced Breakdown Spectroscopy Results on Pulse Energies and Timing Parameters Using Soil Simulants
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Cited by 3 •
2013
LIBS detection capabilities on soil simulants were tested using a range of pulse energies and timing parameters. Calibration curves were used to determine detection limits and sensitivities for different parameters. Generally, the results showed that there was not a significant reduction in detection capabilities using lower pulse energies and non-gated detection.
11:20
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
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Cited by 2 •
2012
An experimental method to examine the early plasma evolution induced by ultrashort laser pulses is described. Using this method, high quality images of early plasma are obtained with high temporal and spatial resolutions. A novel integrated atomistic model is used to simulate and explain the mechanisms of early plasma.
10:27
Fabrication of Nano-engineered Transparent Conducting Oxides by Pulsed Laser Deposition
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Cited by 15 •
2013
We describe the experimental method to deposit nanostructured oxide thin films by nanosecond Pulsed Laser Deposition (PLD) in the presence of a background gas. By using this method Al-doped ZnO (AZO) films, from compact to hierarchically structured as nano-tree forests, can be deposited.
01:16
Pulse
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2024
When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level. The pulse serves as a clinical indicator...
FAQs
These variables determine how rapidly energy enters the system and which pathways become accessible. Pulse duration affects whether molecules respond through excitation, ionization, bond cleavage, or heating, while intensity influences the amount of energy deposited. The medium further shapes energy transfer and reactive-species formation, so changing these conditions can alter reaction rates, pathways, and selectivity.
Energy deposition may promote molecules to electronically excited states, remove electrons through ionization, break chemical bonds, or convert deposited energy into heat. These events can also generate short-lived reactive species. Because several processes may occur on different timescales, the initial molecular response can redirect subsequent chemistry toward different products or reaction pathways.
Brief energy delivery can drive a system away from equilibrium before the deposited energy redistributes or dissipates. This creates opportunities to observe or control short-lived reactive species and transient intermediates that may not accumulate during continuous energy input. Such nonequilibrium behavior is valuable for examining reaction mechanisms and influencing chemical selectivity.
A pulse can provide molecules with access to excited, ionized, heated, or bond-cleaved states that are not equally populated under other energy-delivery conditions. The resulting reactive species can open alternative reaction routes, accelerate selected processes, or favor particular products. Consequently, pulse parameters and the chemical medium become important controls over reaction outcome.
The approach is relevant to photochemistry, plasma chemistry, laser processing, and analytical methods. In these areas, brief energy delivery can initiate chemical transformations, modify materials, or help characterize transient intermediates. Its broader value lies in connecting controlled energy input with nonequilibrium chemistry, making it useful for synthesis, materials modification, and energy-conversion research.
Such experiments can reveal how energy moves through molecules or materials and which short-lived species appear during a reaction. Observations may help researchers relate pulse conditions to reaction rates, pathways, and selectivity, while analytical applications can support characterization of transient intermediates. The resulting information helps connect rapid physical changes with longer-term chemical outcomes.