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New p-Ge THz laser spectrometer for the study of solutions: THz absorption spectroscopy of water

Rev. Sci. Instrum. 76, 063110 (2005); doi:10.1063/1.1928427

Published 26 May 2005

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Andreas Bergner, Udo Heugen, Erik Bründermann, Gerhard Schwaab, and Martina Havenith
Department of Physical Chemistry II, Ruhr-University Bochum, 44780 Bochum, Germany

Danielle R. Chamberlin
Agilent Laboratories, Palo Alto, California 94304

Eugene E. Haller
Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720
We present the development of a high power, tunable far-infrared p-germanium laser spectrometer for the study of dissolved biomolecules in the THz range. As a first application we report on the measurement of the absorption coefficient alpha for liquid water in the frequency range from 81  to  96  cm–1. Using the p-Ge laser spectrometer we were able to penetrate through layers of up to 100  µm thickness. We discuss the advantages and the limitations of this THz spectrometer. We present an analysis of the experimental data based on a chi2 test to provide an objective procedure to minimize the influence of systematic effects, for example of interference due to multiple reflections within the sample chamber. The measured absorption coefficient alpha lies between (410±6) and (490±6)  cm–1 at 81 and 96  cm–1, respectively. ©2005 American Institute of Physics
History: Received 28 October 2004; accepted 17 April 2005; published 26 May 2005
Permalink: http://link.aip.org/link/?RSINAK/76/063110/1
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KEYWORDS and PACS

Keywords
PACS
  • 07.57.Ty
    Infrared spectrometers, auxiliary equipment, and techniques
  • 78.30.Cp
    Infrared and Raman spectra in liquids
  • 78.20.Ci
    Optical constants including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity
  • 42.62.Eh
    Metrological applications of lasers; optical frequency synthesizers for precision spectroscopy
  • 82.80.-d
    Chemical analysis and related physical methods of analysis
  • 78.70.Gq
    Microwave and radio-frequency interactions with condensed matter
  • YEAR: 2005

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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