Modelling interstellar physics and chemistry: implications for surface and solid-state processes.

Area of Science:

• Astrochemistry
• Interstellar Medium Physics
• Solid-State Chemistry

Background:

• The interstellar medium (ISM) is a complex environment where various chemical reactions occur.
• Interstellar dust grains are ubiquitous and possess unique surface properties.
• Surface and solid-state processes on dust grains are hypothesized to influence ISM chemistry.

Purpose of the Study:

• To review regions in the Milky Way and other galaxies where dust grain surface chemistry is significant.
• To identify areas where experimental and theoretical data are available for astrochemical models.
• To highlight the need for further laboratory and computational research on dust-grain-influenced astrochemistry.

Main Methods:

• Review of existing literature on interstellar chemistry and dust grain processes.
• Analysis of astrochemical models incorporating surface and solid-state reactions.
• Identification of key chemical processes occurring on interstellar dust.

Main Results:

• Several regions in galaxies show chemistry dominated by dust grain surface processes.
• Fundamental data exist for some processes, like H₂ molecule formation.
• Significant gaps in data necessitate further laboratory and computational investigation.

Conclusions:

• Surface and solid-state processes on interstellar dust grains are fundamental to astrochemistry.
• These processes are crucial from the early universe to the present day.
• Continued research is vital for refining astrochemical models and understanding cosmic chemical evolution.