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Record Details

Record 13 of 15203
Interstellar Grain Surface Chemistry
Author and Affiliation:
Tielens, Alexander G. G. M.(NASA Ames Research Center, Moffett Field, CA United States)
Cuzzi, Jeffrey N. [Technical Monitor]
Abstract: Chemistry on grain surfaces plays an Important role in the formation of interstellar Ices, It can also influence the composition of the gas phase through outgassing near luminous, newly formed stars. This paper reviews the chemical processes taking place on Interstellar grain surfaces with the emphasis on those transforming CO into other hydrocarbons. At low, molecular cloud temperatures (approximately equal to 10K), physisorption processes dominate interstellar grain surface chemistry and GO is largely hydrogenated through reactions with atomic H and oxidized through reactions with atomic O. The former will lead to the formation of H2CO and CH3OH ices, while the latter results in CO2 ice. The observational evidence for these ices in molecular clouds will be discussed. Very close to protostars, the gas and grain temperatures are much higher (approximately equal to 500K) and chemisorption processes, including catalytic surface reactions, becomes important. This will be illustrated based upon our studies of the Fischer-Tropsch Synthesis of CH4 from CO on metallic surfaces. Likely, this process has played an important role in the early solar nebula. Observational consequences will be pointed out.
Publication Date: Jan 01, 1995
Document ID:
20020033014
(Acquired Mar 29, 2002)
Subject Category: ASTROPHYSICS
Document Type: Preprint
Meeting Information: Workshop on Protostellar Chemistry; 27-31 Mar. 1995; Leiden; Netherlands
Contract/Grant/Task Num: RTOP 399-20-10
Financial Sponsor: NASA Ames Research Center; Moffett Field, CA United States
Organization Source: NASA Ames Research Center; Moffett Field, CA United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: INTERSTELLAR CHEMISTRY; SURFACE REACTIONS; SYNTHESIS (CHEMISTRY); GRANULAR MATERIALS; FISCHER-TROPSCH PROCESS; HYDROCARBONS; METAL SURFACES; SOLAR NEBULA; CARBON DIOXIDE; METHANE; MOLECULAR CLOUDS
Availability Source: Other Sources
Availability Notes: Abstract Only
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