Investigation of the Absorption of Infrared Radiation by Atmospheric Gases: Water, Nitrogen, Nitrous Oxide PDF Download
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Author: Darrell E. Burch
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
The continuum absorption by H2O between 2400 and 2780/cm and by N2 between 2400 and 2650/cm has been measured. The H2O data cover the temperature range from 338 K to 428 K and are primarily for pure H2O. A few preliminary results for H2O + N2 mixtures are discussed. Calculated values of the continuum- absorption coefficient are compared with the experimental results. From absorption data on samples of pure N2 and of N2 + O2 at different temperatures, the attenuation by atmospheric N2 has been calculated for a range of temperatures encountered in the atmosphere. The strengths of several N2O bands between 1100 and 660/cm have been measured and are tabulated.
Author: Darrell E. Burch
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
The continuum absorption by H2O between 2400 and 2780/cm and by N2 between 2400 and 2650/cm has been measured. The H2O data cover the temperature range from 338 K to 428 K and are primarily for pure H2O. A few preliminary results for H2O + N2 mixtures are discussed. Calculated values of the continuum- absorption coefficient are compared with the experimental results. From absorption data on samples of pure N2 and of N2 + O2 at different temperatures, the attenuation by atmospheric N2 has been calculated for a range of temperatures encountered in the atmosphere. The strengths of several N2O bands between 1100 and 660/cm have been measured and are tabulated.
Author: Darrell E. Burch
Publisher:
ISBN:
Category :
Languages : en
Pages : 45
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Book Description
Experimental data are presented on the absorption by a variety of N2O samples between 760 and 2380/cm. Most of the absorption between 760 and 850/cm is due to extreme wings of lines centered outside the interval. Strengths of the important band systems are given. Curves of transmittance and tables of integrated absorptance and the integrated absorption coefficient provide detailed information on the absorption. The objective of the study was to provide the data required to determine the parameters of all N2O absorption lines that absorb significantly over any atmospheric path of interest. (Author).
Author:
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ISBN:
Category : Absorption spectra
Languages : en
Pages : 342
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Author: Darrell E. Burch
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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The continuum absorption by H2O between 800 and 1250/cm and by CO2 from 780 to 900/cm has been measured. The continuum results from the extreme wings of very strong absorption lines centered outside the 800-1250/cm interval. Experimental results are compared with calculated values based on various line shapes. The extreme wings of N2-broadened H2O lines produce less than 0.005 as much continuum absorption as self-broadened H2O lines at the same pressure. Self-broadened H2O lines absorb more than Lorentz-shaped lines, but the wings of self-broadened CO2 lines absorb only approximately 0.01 as much in the 780-900/cm region as if they had the Lorentz shape. The shapes of the wings of the CO2 lines which produce the continuum between 780 and 900/cm are similar to those near 2400/cm for both self broadening and N2 broadening. Suggestions on methods for using the results for atmospheric transmission calculations are given.
Author: Mark P. Esplin
Publisher:
ISBN:
Category : Atmospheric carbon dioxide
Languages : en
Pages : 72
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Book Description
Although both Carbon Dioxide and Nitrous Oxide are minor constituents of the terrestrial atmosphere, they play leading roles in several current atmospheric problems. Both CO2 and N2O are greenhouse gases, and while it is known that the atmospheric concentrations of both gases is increasing, the impact of these trends on global temperature is not yet adequately understood. In addition to being a greenhouse gas, N2O plays an indirect part in ozone chemistry. Heating a molecule makes possible the observations of molecular transitions originating from highly excited rotation-vibration states. Heating a molecule makes possible the observations of molecular transitions originating from highly excited rotation-vibration states. These observations can then be used to characterize the shape of the molecular potential function at increasing distances from the minimum of the potential function. The infrared spectra of linear molecules like CO2 and N2O are composed of vibration bands made up of a number of nearly equally spaced rotation lines. A Fourier Spectrometer is ideally suited to the study of high temperature gases since it meets both of these needs by providing high resolution over a wide spectral region.
Author:
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ISBN:
Category : Infrared radiation
Languages : en
Pages : 18
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Author: Darrell E. Burch
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
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All of the N2O bands expected to absorb significantly between 4000 and 6700/cm have been listed, and the strengths of several of the stronger bands have been determined. Spectral curves are shown for samples at low pressure so that the line structure remains and for samples at approximately 15 atm with the structure smoothed out. (Author).
Author: William Stephen Hines
Publisher:
ISBN:
Category : Radiation
Languages : en
Pages : 278
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Author: Darrell E. Butch
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
The work involves an experimental investigation of the absorption of infrared radiation by atmospheric gases, and a study of the emission by H2O and CO2 at temperatures as high as 2000K. Several hundred absorption spectra of H2O and CO2 samples near room temperature were obtained in the 0.7 to 5.5 micron region. The samples varied in path length from 1 cm to 933 meters and pressures ranged from approximately 5 microns Hg to 15 atmospheres. Strengths of many of the bands were determined and the widths of many of the individual lines were calculated. Abstracts of the technical reports and papers are presented. (Author).
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Category : Meteorological satellites
Languages : en
Pages : 52
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