Pressure-dependent terahertz optical characterization of heptafluoropropane

doi:10.1088/1674-1056/23/10/107804

Abstract Heptafluoropropane (HFP), as the best alternative to halon fire-suppression agents, is now a widely used fire extinguishing agent. The current studies of HFP, concentrating on the extinguishing mechanisms of flames and decomposition products, in general deal with the destructive and high temperature cases. In this paper, terahertz time-domain spectra are used to characterize HFP at different pressures. Optical parameters of HFP, such as absorption coefficient, refractive index, and relative permittivity, and their relationship with concentration of samples, are discussed. The absorption peak of HFP at 0.3 THz depends strongly on the applied pressure, and the corresponding parameters increase almost linearly with increasing HFP concentration. The present study lays a foundation for future extensive applications.

Keywords: optical constant heptafluoropropane terahertz pressure

Received: 11 July 2014
Revised: 20 August 2014
Accepted manuscript online:

PACS:	78.47.D-	(Time resolved spectroscopy (>1 psec))
	42.87.-d	(Optical testing techniques)
	78.20.Ci	(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))

Fund: Project supported by the National Key Basic Research Program of China (Grant No. 2014CB744300), the Specially Funded Program on National Key Scientific Instruments and Equipment Development, China (Grant No. 2012YQ140005), and the Beijing Natural Science Foundation (Grant No. 4122064).

Corresponding Authors: Zhao Kun
E-mail: zhk@cup.edu.cn

About author: 78.47.D-; 42.87.-d; 78.20.Ci

Cite this article:

Leng Wen-Xiu (冷文秀), Ge Li-Na (戈立娜), Xu Shan-Sen (徐山森), Zhan Hong-Lei (詹洪磊), Zhao Kun (赵昆) Pressure-dependent terahertz optical characterization of heptafluoropropane 2014 Chin. Phys. B 23 107804


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