**CasP version 6.0 (November 2020) **

- Better description of the valence electrons according to the IDA and TCS models in Physical Review A, 94, 042704 (2016) and J. Phys. B At. Mol. Opt. Phys., 50,185201 (2017)
- Command line version (Windows/Mac/Linux) from input CasP.ini file

**CasP version 5.2 (December 2013) **

- Capture was added for charge-equilibrium conditions according to the model in Physical Review A84, 052703 (2011)
- Small improvements in the GUI for compounds

**CasP version 5.0 (April 2011) **

- Momentum distributions from Bessel-Fourier transform of HFS wave functions stored in dens.TAB
- Improved storage of electronic densities in dens.TAB
- Use of HFS momentum distributions to implement shell-corrections in neutral targets
- Use of hydrogen-like momentum distribution (with effective charges from the virial theorem) to implement shell corrections in ionized targets
- Charge-state scan option is default
- Improved shell corrections with "forced shell corrections re-normalization"
- Improved electron-loss contribution by using a kinematical suppression for high-energy ionization
- Zeff for the UCA scaling changed to "Original"
- "Get lineshape parameters option" (for head-on collisions) does not use renormalized shell corrections

**CasP version 4.1 (Dezember 2009) **

- Improved treatment of the shell corrections for lineshape asymmetry
- Improved accuracy for numerical integrations and interpolations

**CasP version 4.0 (July 2008) **

- Modification on how BLOCH and SHELL CORRECTIONS are implemented
- Internal charge number for the UCA scaling for screened projectiles was improved
- Close collision function h was replaced by an accurate fit formula
- Improved accuracy for deeply bound inner shell by introducing new gridding
- Improvement of a model for the energy-loss spreading at b =0 (output in lineshape.dat)
- Inclusion of the BARKAS EFFECT for close non-Coulombic collisions
- Possible direct selection of the projectile charge-state
- Speed up of stopping cross-section calculations

**CasP version 3.2 (April 2007) **

- Improved relativistic correction accounting now for the impact-parameter dependence.
- New: projectile-electron loss (energy losses due to projectile ionization and excitation) option now also for compounds
- New MEIS energy-loss parameter output (in ASCII data file ’lineshape.dat’).

**CasP version 3.1 (August 2004) **

- Implementation of extended Bragg’s additivity rule for compounds.
- New solid/gas target selection.
- Improved accuracy for the kernel integration in the case of K shells of very heavy atoms such as Uranium.

**CasP version 3.0 (April 2004) **

- Improved low-energy behavior due to new SHELL CORRECTION option.
- Improved accuracy for deeply bound inner shells.

**CasP version 2.2 (March 2004) **

- Slightly improved fit formulas with shell effects for projectile charge-states in gases (uncertainty is now reduced from dq = 0.48 to 0.46 charge units and from 2.6% to 2.3%)
- Improved accuracy for CHARGE-STATE SCAN option (depends now on accuracy parameter) and, thanks to H.Paul, bug for light ions (H, He) is removed

**CasP version 2.1 (December 2003) **

- New projectile-electron loss (energy losses due to projectile ionization and excitation) option
- Improved fit formulas with shell effects for projectile charge-states in solids (uncertainty is now reduced from dq = 0.54 to 0.28 charge units and from 2.3% to 1.6%)
- Improved accuracy for CHARGE-STATE SCAN option
- Improved periodic table for projectile/target selection

**CasP version 1.2 (October 2001) **

- New projectile charge-state and screening options:

CHARGE-STATE SCAN for equilibrium energy losses

GENERAL projectile screening for**non-equilibrium**energy losses (scaled DHFS potential) - Minor changes for output and data storage (STORE electron density)

**CasP version 1.1 (October 2000) **

- Improved mean-charge-state formulas for gases and solids
- Minor changes for input and data display

**CasP version 1.0 (March 2000) **

- The first public (bug free?) version of the program.

**CasP beta-version 1.0 (January 2000)**

(pre CasP ages)