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Laboratory studies of chemical and photochemical processes relevant to stratospheric ozone (Document No: 19940025046)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Nelson, David D. Kolb, Charles E. Zahniser, Mark S. Worsnop, Douglas R. |
| Copyright Year | 1994 |
| Description | The purpose of this project is to reduce the uncertainty in several key gas-phase kinetic processes which impact our understanding of stratospheric ozone. The main emphasis of this work is on measuring rate coefficients and product channels for reactions of HO(sub x) and NO(sub x) species in the temperature range 200 K to 240 K relevant to the lower stratosphere. Other areas of study have included infrared spectroscopic studies of the HO2 radical, measurements of OH radical reactions with alternative fluorocarbons, and determination of the vapor pressures of nitric acid hydrates under stratospheric conditions. The results of these studies will improve models of stratospheric ozone chemistry and predictions of perturbations due to human influences. In this annual report, we focus on our recent accomplishments in the quantitative spectroscopy of the HO2 radical. This report details the measurements of the broadening coefficients for the v(sub 2) vibrational band. Further measurements of the vapor pressures of nitric acid hydrates relevant to the polar stratospheric cloud formation indicate the importance of metastable crystalline phases of H2SO4, HNO3, and H2O. Large particles produced from these metastable phases may provide a removal mechanism for HNO3 in the polar stratosphere. |
| File Size | 610577 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940025046 |
| Archival Resource Key | ark:/13960/t9t19xp6h |
| Language | English |
| Publisher Date | 1994-04-01 |
| Access Restriction | Open |
| Subject Keyword | Environment Pollution Infrared Spectroscopy Photochemical Reactions Vapor Pressure Vapor Phases Stratosphere Ozone Fluorocarbons Polar Meteorology Nitric Acid Ice Clouds Sulfuric Acid Atmospheric Composition Metastable State Hydroxyl Radicals Peroxides Polar Regions Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
