Equipment for High-Pressure Infrared Measurements

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Abstract:

Since vibrational frequency shifts in liquids, produced by solvents and/or high liquid densities, are relatively small, precision equipment and techniques must be used. Design and operation of modified equipment, including a long path grating monochromator, a pressuring system and cells for pressures up to 5000–10000 atm are described. A static measurement technique, involving precise positioning of the grating and read out of the transmittance on a digital voltmeter, followed by computer processing of the series of points which describe the absorption peak to determine the ν0, are also described. Experimental data on C=C vibration on cis-pentene-2 are presented to illustrate results.

Keywords: Frequency shifts; High pressure infrared instrumentation; Pressure effects on the C=C vibrations in cis-pentene-2

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370270774372065

Affiliations: 1: Department of Chemical and Petroleum Engineering, University of Houston, Houston, Texas 77004 2: Department of Chemical and Petroleum Engineering, University of Houston, Houston, Texas 77004; present address: Ashland Oil & Refining Company, Ashland, Kentucky 41101 3: Department of Chemical and Petroleum Engineering, University of Houston, Houston, Texas 77004; present address: Houston Research Institute, Inc., 6001 Gulf Freeway, Houston, Texas 77023

Publication date: January 1, 1970

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