Terahertz time-domain spectroscopy—a novel method for detection of gaseous free radicals

GE Min; ZHAO Hongwei; ZHANG Zhaoxia; ZHU Hongping; WANG Wenfeng; LI Wenxin

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Terahertz time-domain spectroscopy—a novel method for detection of gaseous free radicals

Radiation Chemistry | 更新时间：2023-03-30

- Terahertz time-domain spectroscopy—a novel method for detection of gaseous free radicals
- Journal of Radiation Research and Radiation Processing Vol. 23, Issue 2, Pages: 83(2005)
- 作者机构：
  
  1.中国科学院上海应用物理研究所　上海　201800
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GE Min, ZHAO Hongwei, ZHANG Zhaoxia, et al. Terahertz time-domain spectroscopy—a novel method for detection of gaseous free radicals. [J]. Journal of Radiation Research and Radiation Processing 23(2):83(2005)
DOI：

GE Min, ZHAO Hongwei, ZHANG Zhaoxia, et al. Terahertz time-domain spectroscopy—a novel method for detection of gaseous free radicals. [J]. Journal of Radiation Research and Radiation Processing 23(2):83(2005) DOI：

摘要

太赫兹（THz）辐射是指频率在0.1—10THz（波长30μm—3mm）之间的电磁波，其波段位于微波和红外光之间。近十余年来，超快激光技术的迅速发展，为THz脉冲的产生提供了稳定、可靠的激发光源，使THz辐射技术和应用研究得到蓬勃发展。THz-TDS（Terahertz time-domain spectroscopy）就是基于飞秒超快激光技术的THz波段光谱测量新技术。它利用物质对THz频带的不同特征吸收谱分析研究物质成分、结构及其相互作用关系。典型的THz-TDS装置可简要概括如下：来自超快激光器的具有皮秒脉宽的激光脉冲被分为两路，一路作为泵浦光，激发太赫兹发射元件产生太赫兹波。另一路作为探测光，与太赫兹脉冲汇合后共线通过太赫兹探测元件。通过延迟装置改变探测光与泵浦光之间的光程差，使探测光在不同的时刻对太赫兹脉冲的电场强度进行取样测量，最后获得太赫兹脉冲电场强度的时间波形,[1],。通过对测量频谱的分析和处理，可以同时得到被测样品的吸收和色散光谱，另外还可以获得物质的折射率、介电常数、吸收系数和载流子浓度等参数。

Abstract

Terahertz time-domain spectroscopy (THz-TDS) is a new technique based on femto-second laser technology. It has shown important applicability in researches of different fields, such as condensed matter, gas-phase, and biochemistry, etc. The characteristic spectra of substances in THz range may provide important information of configuration, constitutes and the molecular interactions. This paper briefly introduces its applications in detecting and identifying gaseous free radicals.

关键词

太赫兹时域光谱自由基

Keywords

Terahertz (THz)Terahertz time-domain spectroscopy (THz-TDS)Free radical

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