TUNABLE DIODE LASER SPECTROSCOPY OF $H_{2}SO_{4}$ AND $SO_{3}$ VAPORS ABOVE A HOT, AZEOTROPIC, AQUEOUS SULFURIC ACID SOLUTION
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Date
1977
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Ohio State University
Abstract
Two of the strong $H_{2}SO_{4}$ vapor bands (880 and 1220 $cm^{-1}$) and one $SO_{3}$ band (1390 $cm^{-1}$) have been studied at temperatures up to $200^\circ$ C over an azeotropic solution (99% $H_{2}SO_{4}$). Ultra high resolution (about $10^{-4} cm^{-1}$) spectra covering greater than 20 $cm^{-1}$ of the two $H_{2}SO_{4}$ bands show almost no fine structure even at pressures of 1 Torr, while a dense line structure is observed for $SO_{3}$. At atmospheric pressure (760 Torr of $N_{2}$) continuous spectra without discernible line structure are observed for both species. Absorption strength at the center of the $H_{2}SO_{4}$ bands at low pressure (1 Torr) is 4 (cm-atm)$^{-1}$. At atmospheric pressure (760 Torr of $N_{2}$) absorption strength of both $H_{2}SO_{4}$bands measured at $200^\circ$ C is about 3.7 (cm-atm)$^{-1}$ near the band center.
Description
This work was supported by the U.S. Environmental Protection Agency, Research Triangle Park, North Carolina.
Author Institution: Laser Analytics Inc., 38 Hartwell Avenue, Lexington
Author Institution: Laser Analytics Inc., 38 Hartwell Avenue, Lexington