局深紫外线拉曼光谱仪用于痕迹检测
Sergei V Bykov1, Sanford A Asher1
1Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
Applied spectroscopy
|January 11, 2024
概括
这项研究引入了一种新的深紫外线 (DUV) 拉曼光谱仪,用于敏感,对爆炸物和生物分子的对峙检测. 该系统达到大约1μg/cm2的痕迹检测极限,这对安全和诊断至关重要.
科学领域:
- 频谱学是一种光谱学.
- 分析化学 分析化学
- 化学传感器 化学传感器
背景情况:
- 化学物种的痕迹检测需要高灵敏度的分析技术.
- 深紫外线 (DUV) 刺激可以增强特定分子的拉曼信号.
- 对于安全和遥感领域的应用来说,对峙检测能力至关重要.
研究的目的:
- 开发和演示一个高灵敏度,低散光对峙的DUV拉曼光谱仪.
- 使用共振拉曼增强检测微量爆炸物和生物分子.
- 为了确定远程DUV拉曼光谱的检测极限和影响因素.
主要方法:
- 使用 228 nm Nd:GdVO4 激光源开发定制的 DUV 拉曼光谱仪.
- 使用了卡塞格林望远镜,DUV网格,镜子和雷利排斥波器.
- 测量爆炸物和生物分子的光谱在3米的对峙距离,积累时间短.
主要成果:
- 实现了爆炸物 (酸,TNT,PETN) 和生物分子 (lyszyme,tryptophan等) 的高信号噪声比谱. ) 的情况.
- 估计的平均紫外线共振拉曼 (UVRR) 检测极限为~1μg/cm2的滴膜.
- 通过使用连续光扫描,在玻璃基板上的酸确定了0.5μg/cm2的检测极限.
结论:
- 开发的DUV拉曼光谱仪能够对微量化学物种进行敏感的对峙检测.
- 分析物的光化学和形态显著影响UVRR检测极限.
- 该系统展示了快速,远程识别危险材料和生物分子的潜力.
相关概念视频
Raman Spectroscopy: Overview
396
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
396
UV–Vis Spectrometers
1.3K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
1.3K
Raman Spectroscopy Instrumentation: Overview
406
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
406
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
2.6K
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for...
2.6K
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
372
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
The ATR process begins by directing a beam...
372
Atomic Absorption Spectroscopy: Instrumentation
732
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.
The atomizer used in AAS can be either a flame atomizer or an...
The atomizer used in AAS can be either a flame atomizer or an...
732


