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FTIR Spectroscopy of HNO3 and NO2 Relevant to Stratospheric Wake AnalysisThe Fourier Transform Infrared (FTIR) technique has been employed to measure absolute concentrations of nitric acid (HNO3) and nitrogen dioxide (NO2) with 1/cm resolution and an absorption pathlength of 4 m under quasi-static and flow conditions at atmospheric pressure and room temperature. Water features seen under quasi-static conditions diminished in intensity under flowing conditions. Nitric acid was observed in the 1660-1760/cm range, while nitrogen dioxide was detected both in the 1536-1660 and 1213-1400/cm ranges. Concentrations of nitrogen dioxide and nitric acid were determined to be 11.9 and 4.35 parts per million (ppm), respectively, with an uncertainty of 0.2 ppm. Experiments are underway with a 10 m cell to measure the absorption of nitric acid, water, sulfur dioxide, hydrochloric acid and ammonia on various materials such as glass, teflon, stainless steel and aluminum used for implementation of the flow system. Such materials will be used for the measurements of stratospheric trace gases by the Quartz Crystal Microbalance (QCM) and Surface Acoustic Wave (SAW) devices.
Document ID
Document Type
Conference Paper
Abina, Rafiu A.
(Howard Univ. Washington, DC United States)
Misra, Prabhakar
(Howard Univ. Washington, DC United States)
Okabe, Hideo
(Howard Univ. Washington, DC United States)
Chu, P. M.
(National Inst. of Standards and Technology Gaithersburg, MD United States)
Sams, Robert L.
(National Inst. of Standards and Technology Gaithersburg, MD United States)
Date Acquired
August 17, 2013
Publication Date
January 1, 1997
Publication Information
Publication: The First National Student Conference: NASA University Research Centers at Minority Institutions
Subject Category
Accession Number
Funding Number(s)
Distribution Limits
Public Use Permitted.
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