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A Python/C based package, available at http://github.com/ProkopHapala/ProbeParticleModel/tree/PPSTM, which primary purpose is to simulate STM or dI/dV signal obtained with tilting tip apex (like CO, or Xe tip). It is based on the original PPAFM Python/C by Prokop Hapala and Co. http://github.com/ProkopHapala/ProbeParticleModel/ for simulation of tilting tip apex' AFM images.
The PP-STM code calculates an STM or dI/dV signal based on the input from various Linear Combination of Atomic Orbitals (LCAO)-DFT codes. These inputs are eigen-energies of eigen-states (molecular orbitals) and LCAO coefficients (for each state and atomic orbital of sample). Sample can be approximated by freestanding molecule, or by full system - molecule/substrate.
- input parameters
- reading input files
- running fixed tip STM calculations
- running PP-dI/dV
Theoretical prediction for Coronene molecule modified with with four nitrogen atoms :
LDA predicted HOMO for this molecule:
and LUMO: