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相关概念视频

Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

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Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic 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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Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

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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.
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Atomic Absorption Spectroscopy: Atomization Methods01:25

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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一个紧且高度聚合的原子/分子光束源.

Geetika Bhardwaj1, Saurabh Kumar Singh1, Pranav R Shirhatti1

  • 1Tata Institute of Fundamental Research Hyderabad, 36/P Gopanpally, Hyderabad 500046, Telangana, India.

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概括
此摘要是机器生成的。

研究人员使用细分毛细管设计开发了一种紧的原子束源. 这种创新的光束源实现了高聚合,使得精确的表面监测应用.

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科学领域:

  • 原子和分子物理 原子和分子物理
  • 表面科学是一门学科.
  • 材料科学 材料科学 材料科学

背景情况:

  • 开发精确的原子和分子光束源对于先进的表面表征至关重要.
  • 现有源往往缺乏特定应用所需的聚合或紧度.

研究的目的:

  • 设计,描述和展示一种新,紧,高度聚合的原子/分子光束源的应用.
  • 为了研究细分毛细血管设计用于光束对接的有效性.

主要方法:

  • 使用注射器针构建一个细分毛细血管光束源.
  • 测量生成的束的角度宽度.
  • 模拟自由分子流动以分析光束特征.
  • 在通过光圈反射度测量对暴露在氧气中的Cu(110) 表面表面覆盖面的变化实时监测中的应用.

主要成果:

  • 细分毛细管设计有效地抑制了离轴轨迹,从而形成了一个狭窄的束,全宽半最大为7mrad.
  • 该源被证明适用于实时监测表面覆盖率.
  • 使用束进行的光谱反射度测量提供了对表面变化的洞察力.

结论:

  • 开发的细分毛细血管原子/分子光束源提供了一个简单,紧,高度聚合的解决方案.
  • 这种来源对于精确的表面科学研究是有效的,包括对表面覆盖面的实时监测.
  • 该设计代表了对于需要狭窄原子束的应用程序的重大进步.