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相关概念视频

Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

676
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
676
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

435
Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
435
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

127
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
127
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

279
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.
279

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相关实验视频

Updated: May 16, 2025

Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
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离子液体电喷射束的目标性能特征表征.

Steven M Arestie1, Colleen M Marrese-Reading1, Saba Z Shaik2

  • 1NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, 91109 CA USA.

Journal of electric propulsion
|April 4, 2025
PubMed
概括
此摘要是机器生成的。

了解设施效应对于电子喷雾推进器测试至关重要. 这项研究量化了二次粒子冲击,并证明了光束目标设计如何可以防止人工膨胀的电流测量,确保准确的性能合格.

关键词:
电子喷雾剂是一种电子喷雾剂.设施影响 设施影响微推力 微推力 微推力

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Atmospheric-pressure Molecular Imaging of Biological Tissues and Biofilms by LAESI Mass Spectrometry
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科学领域:

  • 太空飞船的推进系统
  • 血物理学的等离子体物理学
  • 材料科学是一种材料科学.

背景情况:

  • 电子喷射推进器对于长期太空任务至关重要,但地面测试因设施效应而复杂化.
  • 以前的研究集中在光束物理和羽毛动力学上,忽视了设施相互作用.
  • 设施效应,如二次颗粒生成,可以显著影响推进器性能和寿命.

研究的目的:

  • 为了描述离子液体电喷冲击对光束目标产生的二次粒子的重要性.
  • 调查新型光束目标设计和偏差对这些二次粒子的影响.
  • 提供实验和建模数据,以减轻电子喷雾推进器测试中的设施效应.

主要方法:

  • 来自光束目标的二次电流和质量流量的实验测量.
  • 二次粒子的初始飞行时间测量.
  • 计算建模以支持实验数据的解释.

主要成果:

  • 已识别的二次粒子,其电荷-质量比低至31C/kg.
  • 证明,由于电子回流,不适当的光束目标偏向或目标的缺失可以使发射电流膨胀高达20%.
  • 优化的光束目标和屏幕电压分别被确定为-100V和-200V.

结论:

  • 对于精确的电喷推进器测试,必须考虑设施效应,特别是二次粒子生成和电子回流.
  • 适当的光束目标设计和偏差对于减轻这些影响和防止性能指标人工膨胀至关重要.
  • 这项研究提高了对设施效应的理解和缓解,这对于在太空飞行任务中合格的电喷射推进器至关重要.