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Dust Surface Chemistry in Space

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Questions and Answers

What is the underlying principle of heterogeneous catalysis?

The surface has no effect on the activation energy of chemical reactions

The surface reduces the activation energy of chemical reactions (correct)

The surface increases the activation energy of chemical reactions

The surface only affects homogeneous catalysis

What is the primary mechanism for H2 production in the ISM?

Surface reactions between H atoms on dust grains (correct)

Cosmic rays interacting with H atoms

UV/ion/electron impact on H atoms

Gas-phase reactions between H atoms

What is the role of dust grains in the formation of water and ammonia–water ice?

They provide a surface for co-adsorption of H, O, and N atoms (correct)

They are only involved in gas-phase reactions

They absorb all incoming radiation

They prevent the formation of water and ammonia–water ice

What is the benefit of surface reactions on dust grains?

They allow slow gas-phase reactions to proceed quickly Signup and view all the answers

What is the current limitation in understanding dust grain surface reactions?

The surface mobility of species is unknown Signup and view all the answers

What is the significance of heterogeneous catalysis in the ISM?

It is the primary mechanism for H2 production Signup and view all the answers

What is the result of the reaction between two H atoms on a dust grain surface?

Formation of H2 Signup and view all the answers

What is the role of ISO spectra in the context of dust grain surface reactions?

They detect the formation of water and ammonia–water ice Signup and view all the answers

What is the primary goal of studying dust grain surface reactions?

To model molecular clouds accurately Signup and view all the answers

What is the significance of adsorption on dust grain surfaces?

It allows for the formation of complex molecules Signup and view all the answers

What is the current approach to modeling dust grain surface reactions?

Making sensible estimates of rate constants Signup and view all the answers