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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

155
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...
155
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

208
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....
208
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

2.0K
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...
2.0K
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

329
For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
329
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

573
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...
573

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相关实验视频

Updated: Jun 21, 2025

Three-dimensional Optical-resolution Photoacoustic Microscopy
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Three-dimensional Optical-resolution Photoacoustic Microscopy

Published on: May 3, 2011

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在固体样本上的石英增强光声谱学.

Judith Falkhofen1,2, Marc-Simon Bahr1,2, Bernd Baumann1

  • 1Heinrich Blasius Institute of Physical Technologies, Hamburg University of Applied Sciences, 20999 Hamburg, Germany.

Sensors (Basel, Switzerland)
|July 13, 2024
PubMed
概括

研究人员开发了一种新型的光声细胞,用于对固体样本进行石英增强光声谱 (QEPAS) 分析. 这种新的QEPAS单元提高了气体和固体材料分析的灵敏度和信号放大.

关键词:
这是一个FE模拟器.在这里,我们可以看到 IR IR IR IR.这是一个MEMS麦克风.这就是QEPASAS.更高的波器的高波器摄影声学光谱学是指光声学光谱学响应器设计 响应器设计固体样本 固体样本 固体样本超声波超声波是指超声波的使用.

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科学领域:

  • 频谱学是一种光谱学.
  • 声学 声学 在声学方面
  • 激光技术 激光技术 激光技术

背景情况:

  • 石英增强光声谱 (QEPAS) 在敏感气体样本分析方面表现出色.
  • 现有的QEPAS方法主要局限于气相检测.
  • 开发可适应的QEPAS技术用于固体样本对于扩展应用至关重要.

研究的目的:

  • 设计和验证第一个光声学 (PA) 电池,专门用于固体样本的QEPAS分析.
  • 为了优化电池的声学特性,以提高信号检测.
  • 为了证明新细胞在固体材料表征方面的有效性.

主要方法:

  • 开发了一种新型的半开放圆柱形光声细胞.
  • 使用从带间级联激光器 (ICL) 发出的调制红外光激发样本.
  • 使用石英调音叉 (QTF) 进行声波检测和3D有限元素 (FE) 模拟进行细胞优化.
  • 使用超声微电机系统 (MEMS) 麦克风进行实验验证.

主要成果:

  • 圆柱形的PA电池实现了与QTF频率相匹配的声学共振,放大了PA信号.
  • 3D FE模拟证实了给定QTF共振的最佳细胞尺寸.
  • 频率依赖的QEPAS测量显示低噪音和高质量因子.
  • 对三种固体合成物质的QEPAS分析产生了一种线性依赖吸收的信号.

结论:

  • 开发的光声细胞对固体样本的QEPAS分析是有效的.
  • 电池设计增强了信号放大和检测灵敏度.
  • 这一进步扩大了QEPAS对固态材料表征的适用性.