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Fourier Transform Infrared (FT-IR) Spectroscopy of Atmospheric Trace Gases HCl, NO and SO2Fourier Transform Infrared (FT-IR) spectral data have been recorded in the spectral region 400-4000/cm of hydrogen chloride and sulfur dioxide with I/cm resolution and of nitric oxide with 0.25 cm-i resolution, under quasi-static conditions, when the sample gas was passed through tubings of aluminum, copper, stainless steel and teflon. The absorbance was measured for the rotational lines of the fundamental bands of (1)H(35)Cl and (1)H(37)Cl for pressures in the range 100-1000 Torr and for the (14)N(16)O molecule in the range 100-300 Torr. The absorbance was also measured for individual rotational lines corresponding to the three modes of vibrations (upsilon(sub 1) - symmetric stretch, upsilon(sub 2) - symmetric bend, upsilon(sub 3) - anti-symmetric stretch) of the SO2 molecule in the pressure range 25-150 Torr. A graph of absorbance versus pressure was plotted for the observed rotational transitions of the three atmospherically significant molecules, and it was found that the absorbance was linearly proportional to the pressure range chosen, thereby validating Beer's law. The absorption cross-sections were determined from the graphical slopes for each rotational transition recorded for the HCl, NO and SO2 species. Qualitative and quantitative spectral changes in the FT-IR data will be discussed to identify and characterize various tubing materials with respect to their absorption features.
Document ID
20000032202
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Haridass, C.
(Howard Univ. Washington, DC United States)
Aw-Musse, A.
(Howard Univ. Washington, DC United States)
Dowdye, E.
(Howard Univ. Washington, DC United States)
Bandyopadhyay, C.
(Howard Univ. Washington, DC United States)
Misra, P.
(Howard Univ. Washington, DC United States)
Okabe, H.
(Howard Univ. Washington, DC United States)
Date Acquired
August 19, 2013
Publication Date
February 22, 1998
Publication Information
Publication: NASA University Research Centers Technical Advances in Aeronautics, Space Sciences and Technology, Earth Systems Sciences, Global Hydrology, and Education
Volume: 2 and 3
Subject Category
Environment Pollution
Funding Number(s)
CONTRACT_GRANT: NAG3-1677
CONTRACT_GRANT: NAGW-2950
CONTRACT_GRANT: EPA-R819720-01-3
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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