# Trim.SP

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Layer # | Composition | Density [g/cm3] | Thickness [Å]

Projectile parameters
Projectile |
Number of projectiles |
Starting depth [Å] |
Depth increment [Å] |
Energy [eV] |
Energy sigma [eV] |
Angle [deg] |
Angle sigma [deg] |
Random seed |

Enable scan on
Set of values: Corresponding depth increment:

Scan parameter
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EF Cutoff energy of projectiles (in eV); must be greater than zero. Used for low projectile energies (< 1000 eV) and ESB = 0. EF should be of the order of ~0.2 eV, but not above SBE (for sputtering data). With increasing projectile energy, EF can be increased to save computing time.

KK0 Maximum order of weak (simultaneous) collisions between projectile and target atoms:

1. No weak collisions included.
2. ???
3. Sufficient for most calculations.
4. Only useful for very heavy particles; increases computing time.
5. Only useful for very heavy particles; increases computing time.

ESB Surface binding energy for projectiles (in eV). This value is zero for the noble gases, but ESB should be larger than zero if the projectile is an active chemically species. ESB = SBE for self-sputtering calculations.

KK0R Maximum order of weak (simultaneous) collisions between target atoms:

1. No weak collisions included.
2. ???
3. Sufficient for most calculations.
4. Only useful for very heavy particles; increases computing time.
5. Only useful for very heavy particles; increases computing time.

SHEATH Sheath potential (in eV); typically 3 * kT (i.e., 3 * |projectile energy|).

KDEE1 Inelastic energy loss model for projectiles:

1. Nonlocal (Lindhard-Scharff).
2. Local (Oen-Robinson).
3. Equipartition of local and nonlocal models (i.e., options 1 & 2).
4. Nonlocal (Anderson-Ziegler tables for hydrogen); must be used for hydrogen-like projectile with energies > 10 keV.
5. Nonlocal (Ziegler tables for helium); must be used for helium-like projectiles with energies > 50 keV.

Note: options 1, 2, and 3 can only be used at energies below the stopping power maximum.

ERC Recoil cutoff energy (in eV); usually equal to the surface binding energy.

KDEE2 Inelastic energy loss for target atoms:

1. Nonlocal (Lindhard-Scharff).
2. Local (Oen-Robinson).
3. Equipartition of local and nonlocal models (i.e., options 1 & 2).

Note: options 1, 2, and 3 can only be used at energies below the stopping power maximum.

RD Depth (in Å) to which recoils are followed. RD = 50 is usually sufficient for sputtering (if the projectile energy is not too high). Use RD = 100 * CW (i.e., the depth increment) for following the full collision cascade.

IPOT Interaction potential between projectile and target atoms:

1. Krypton-Carbon (Kr-C) potential.
2. Molière potential.
3. Ziegler-Biersack-Littmark (ZBL) potential.

CA Correction factor to the Firsov screening length for collisions between projectile and target atoms (only used in the application of the Molière potential); usually on the order of ~1.0.

IPOTR Interaction potential between target atoms:

1. Krypton-Carbon (Kr-C) potential.
2. Molière potential.
3. Ziegler-Biersack-Littmark (ZBL) potential.

Force the TRIM.SP code to use stopping power parameters from the old ICRU tables.

Use ICRU parameters

IRL Collision recoils:

1. No recoils are generated (i.e., no sputtering effects); used to speed up the calculation if only projectile ranges are of interest.
2. Calculate collision recoils.

For further details see:

W. Eckstein, Computer Simulation of Ion-Solid Interactions,
Springer Series in Materials Science, Vol. 10 (Springer-Verlag, Berlin, 1991).
https://doi.org/10.1007/978-3-642-73513-4

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