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01:20Atomic Emission Spectroscopy: Overview
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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01:22Carrier Generation and Recombination
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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
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02:26Photoelectric Effect
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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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01:22Atomic Emission Spectroscopy: Instrumentation
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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01:26Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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01:15Transmission Electron Microscopy
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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
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Entangled X-Ray Photon Pair Generation by Free-Electron Lasers.
Linfeng Zhang1, Zunqi Li1, Dongyu Liu1,2
1State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China.
Physical Review Letters
|September 1, 2023
Summary
We developed a quantum electrodynamical theory for generating entangled x-ray photon pairs using free-electron lasers (FELs). This method offers a unique advantage for producing highly entangled x-ray photons for quantum optics applications.
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Area of Science:
- Quantum optics
- X-ray physics
- Quantum electrodynamics
Background:
- Entangled photon pair generation is crucial for quantum optics.
- Free-electron lasers (FELs) offer unique capabilities for advanced light sources.
Purpose of the Study:
- To establish a quantum electrodynamical theory for entangled x-ray photon pair emission from FELs.
- To propose and demonstrate a scheme for generating highly entangled x-ray photon pairs.
Main Methods:
- Developing a quantum electrodynamical theory.
- Utilizing microbunched electron pulses in an undulator.
- Numerical demonstration of entangled emission properties.
Main Results:
- Coherent amplification of entangled photon pair emission.
- Generation of highly entangled x-ray photon pairs.
- Demonstration of unique FEL advantages in this process.
Conclusions:
- FELs provide a powerful platform for generating entangled x-ray photons.
- The developed theory and scheme are significant for advancing x-ray quantum optics.
- This work highlights the potential of FELs in quantum information science.