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The far-infrared absorption of dichloromethane determined by spot frequency measurements
Affiliation:1. Department of Chemical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Postal code: 1477893855, Iran;2. Department of Polymer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Postal code: 1477893855, Iran;3. Department of Polymer Engineering, South Tehran Branch, Islamic Azad University, Tehran, Postal code: 1584743311, Iran;4. New Technologies Research Center (NTRC) Amirkabir University of Technology, Tehran, Postal code: 159163-4311, Iran;5. Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Postal code: 1584743311, Iran;1. Center of Excellence for Advanced Materials Research - king Abdulaziz University, Jeddah, 21589, Saudi Arabia;2. Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia;3. Chemistry Department, Faculty of Science, Assiut University, 71516, Assiut, Egypt;1. Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany;2. Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Straße 2, Darmstadt, 64287, Germany;3. Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany;4. State Key Laboratory of Photovoltaic Materials & Technology, Yingli Green Energy Holding Co., Ltd., Boading, 071051, China;5. Hebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding, 071002, China
Abstract:The absorption of dichloromethane at 298 K has been measured at 14 spot frequencies from 33 to 213 cm−1 using an Apollo far-i.r. laser system with methanol as the lasing gas optically pumped by a 50 W CO2 laser. The results agree with those obtained by Fourier transform interferometry and allow a greater accuracy in the measurement of absolute intensity and spectral moments for this intensely absorbing liquid. The band profile is rationalized using a three parameter Mori continued fraction with two of the parameters predetermined from knowledge of the Debye relaxation time and the (forth moment) mean square torque.
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