Accession Number : AD0687872

Title :   A SEARCH FOR CARBON ATOMS.

Descriptive Note : Technical rept. Sep 67-Sep 68,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Whittaker,A. Greenville ; Kintner,Paul L.

Report Date : OCT 1968

Pagination or Media Count : 15

Abstract : Attempts were made to measure carbon atom concentration in graphite vapor by using optical absorption of the carbon resonance multiplet at 1657A. No carbon atoms could be detected in a variety of flow experiments. It was shown that this result was due to very rapid reactions of carbon atoms with other carbon species. Carbon atoms were detected in a static system when sublimation from the alpha direction of pyrolytic graphite was used. Under corresponding conditions, no carbon atoms could be detected if spectrographic grade of graphite was used as a vapor source. Emission of colloidal particles was observed during the sublimation of a variety of graphites. The particles were captured and characterized by use of the electron microscope. This study indicated that all the particles came directly from the subliming sample. There was no evidence that particles were formed by condensation of carbon from the vapor phase. (Author)

Descriptors :   (*GRAPHITE, VAPORIZATION), (*ATOMIC SPECTROSCOPY, *CARBON), SUBLIMATION, ULTRAVIOLET SPECTROSCOPY

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE