Orientation Dependent Far-Infrared Terahertz Absorptions in Single Crystal Pentaerythritol Tetranitrate (PETN) Using Terahertz Time-Domain Spectroscopy

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• 作者：Von H. Whitley ; Daniel E. Hooks ; Kyle J. Ramos ; Timothy H. Pierce ; John F. O鈥橦ara ; Abul K. Azad ; Antoinette J. Taylor ; Jeffrey Barber ; Richard D. Averitt
• 刊名：Journal of Physical Chemistry A
• 出版年：2011
• 出版时间：February 3, 2011
• 年：2011
• 卷：115
• 期：4
• 页码：439-442
• 全文大小：185K
• 年卷期：v.115,no.4(February 3, 2011)
• ISSN：1520-5215

文摘

Terahertz time-domain spectroscopy (THZ-TDS) has been used to measure the absorption spectra in the range 7鈭?00 cm^鈭? (0.2鈭? THz) of single crystal pentaerythritol tetranitrate (PETN). Absorption was measured in transmission mode as a function of incident polarization with the incident and transmitted wave vectors oriented along the crystallographic directions [100], 10(a/c)², and 110. Samples were rotated with respect to the incident polarization while absorption was measured at both 300 and 20 K. Comparatively minor differences were observed among the three orientations. Two broad absorptions at 72 and >90 cm^鈭?, and several weaker absorptions at 36, 55, 80, and 82 cm^鈭?, have been observed at cryogenic temperatures.