Nautilus Multi-Grain Code (NMGC), an astrochemistry gas-grain code

Contents

• Introduction
  • What is NMGC?
  • Copyright
• Installation of NMGC
  • How to obtain NMGC
  • Requirements
  • Compiling the code
• How to use the code
  • Quickstart
  • The four actions
    • run
    • outputs
    • rates
    • major_reactions
  • The four modes
    • Dimensions
    • Grain sizes
• The input and output files of NMGC
  • INPUTS
    • abundances.in (required)
    • activation_energies.in (required)
    • chemical network (required)
      • gas_species.in
      • grain_species.in
      • gas_reactions.in
      • grain_reactions.in
    • element.in (required)
    • parameters.in (required)
    • surface_parameters.in (required)
    • 0D_grain_sizes.in (optional)
    • 1D_grain_sizes.in (optional)
    • 1D_static.dat (optional)
    • structure_evolution.dat (optional)
  • OUTPUTS
    • abundances.out
    • rates.00000i.out
    • col_dens.00000i.out
    • species.out
    • elemental_abundances.out
    • info.out
    • ab/, ml/, and struct/
    • rates.out
    • rate_coefficients.out
• The astrochemistry of NMGC
  • Introduction
  • Chemical kinetics
  • Rate-equation approach
  • The three-phase model
    • The three coupled ODEs
    • Surface-to-mantle and mantle-to-surface transfer
    • Mantle-to-surface swapping
    • Surface-to-mantle swapping
    • Mantle chemistry
    • Three-phase flag
  • Gas-phase chemistry
    • Ionization and dissociation by cosmic rays
    • Ionization and dissociation by UV (ISRF or CR-induced)
  • Surface chemistry
    • Adsorption
    • Desorption
      • Thermal desorption
      • Cosmic-ray desorption (sputtering)
      • Photodesorption
      • Chemical (reactive) desorption
    • Surface migration
      • Thermal hopping
      • Quantum tunnelling
    • Surface reaction mechanisms
      • Langmuir-Hinshelwood (LH)
      • Eley-Rideal (ER)
      • Hot Atom (HA) mechanism
  • How NMGC treats H₂ formation
    • Equivalent density correction
    • Polylogarithmic analytical fits
• The specificities of the multi-grain mode
  • NMGC versus the main version of Nautilus
    • Grain populations and abundances
    • Chemical species labeling
    • Grain temperatures
    • Accretion of gas-phase species
    • Thermal desorption
    • Cosmic-ray-induced desorption
    • Surface diffusion and Langmuir-Hinshelwood reactions
    • Cosmic-ray-induced diffusion (CRID)
    • Outputs
  • What input dust temperatures should I use?
• Best practices