Accession Number : AD0689858

Title :   ABSORPTION COEFFICIENTS OF GASES IN THE RANGE FROM 100 A TO 500 A.

Descriptive Note : Final technical rept. Apr 67-Mar 68,

Corporate Author : CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE BELLEVUE (FRANCE) LABORATOIRE DES HAUTES PRESSIONS

Personal Author(s) : Vodar,Boris

Report Date : 31 MAR 1968

Pagination or Media Count : 34

Abstract : Absorption spectra were obtained between 500 and 100 A (25-125 eV) for several gases: NO, CO, CO2, H2O, NH3, CH4 using a grazing incidence grating spectrograph, a condensed spark as the continuum background and very thin layers of appropriate materials for cell windows. This region is characterized by continuous absorption rapidly decreasing towards short wavelengths, commonly attributed essentially to photoionization processes. Whenever possible, our results (near 500 A) are compared to results of other authors, and, generally, the agreement is very satisfactory. Some interesting comparisons can be made between the absorption curves of similar molecules such as for example H2O, NH3 and CH4. Except for CH4 it is not possible to relate experimental results to those calculate as an adequate theory has yet to be developed. (Author)

Descriptors :   (*NITROGEN OXIDES, ULTRAVIOLET SPECTROSCOPY), (*CARBON MONOXIDE, ULTRAVIOLET SPECTROSCOPY), (*CARBON DIOXIDE, ULTRAVIOLET SPECTROSCOPY), (*WATER, ULTRAVIOLET SPECTROSCOPY), (*AMMONIA, ULTRAVIOLET SPECTROSCOPY), (*METHANE, ULTRAVIOLET SPECTROSCOPY), ULTRAVIOLET SPECTRA, VISIBLE SPECTRA, ULTRAVIOLET FILTERS, FRANCE

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE