Detailed information on the present PCA and UCA models may be found in the following publications

1. P.L. Grande and G. Schiwietz,
"Impact-Parameter Dependence
of the Electronic Energy Loss of Fast Ions"
Phys.Rev. A58, 3796 (1998)

2. G. Schiwietz and P.L. Grande,
"A Unitary Convolution Approximation for the
Impact-Parameter Dependent Electronic Energy Loss"
Nucl. Instr. and Meth. B153, 1 (1999)

3. G.M de Azevedo, P.L. Grande, and G. Schiwietz,
"Impact-Parameter Dependent Energy Loss of Screened Ions",
Nucl. Instr. and Meth. B164-165, 203-211 (2000)

4. G. de M. Azevedo, P. L. Grande, M. Behar, J.F. Dias, and G. Schiwietz,
"Giant Barkas effect observed for light ions channeling in Si",
Phys.Rev.Lett. 86, 1482 (2001)

5. P. L. Grande and G. Schiwietz,
"The unitary convolution approximation for heavy ions",
Nucl. Instr. Meth. B195, 55 (2002)

6. P. L. Grande and G. Schiwietz,
" Ionization and energy loss beyond perturbation theory",
in "Advances in Quantum Chemistry", vol. 45, pp.7-46
(book ed. by J. Sabin, 2004, Elsevier Inc.)

7. P. L. Grande and G. Schiwietz
    "Convolution approximation for the energy loss, ionization probability and straggling of fast ions",
  Nucl. Instr. Meth. B267, 859-863 (2009)

8. G. Schiwietz and P.L. Grande,
"Stopping of Protons - Improved Accuracy of the UCA Model",
Nucl. Instr. and Meth. B273, 1-5 (2012)

9. G. Schiwietz and P.L. Grande,
"Introducing electron capture into unitary-convolution-approximation energy-loss theory at low velocities",
Physical Review A 84, 052703 (2011)

10. P. L. Grande,
“Alternative treatment for the energy-transfer and transport cross section in dressed electron-ion binary collisions”,
Physical Review A, 94, 042704 (2016)

11. F. Matias, R. C. Fadanelli. P. L. Grande, N. E. Koval, R. D. Muino, A. G. Borisov, N. R. Arista, and G. Schiwietz ,
“Ground- and excited-state scattering potentials for the stopping of protons in an electron gas”,
J. Phys. B At. Mol. Opt. Phys., 50,185201 (2017)

12. F. Matias, R. C. Fadanelli, P. L. Grande, N. R. Arista, N. E. Koval, and G. Schiwietz ,
“Stopping power of cluster ions in a free-electron gas from partial-wave analysis” ,
Physical Review A, 98, 062716 (2018)

Please cite the latest references and state the type of model ("UCA" is the default value) and the screening function ("charge-state scan" is the default value), when using results of CasP.

Auxiliary information on the projectile charge-state formulas may be found in

1. G. Schiwietz and P.L. Grande,
" Improved Charge-State Formulas",
Nucl. Instr. and Meth. B175-177, 125-131 (2001)

2. G. Schiwietz, M. Roth, K. Czerski, F. Staufenbiel, and P.L. Grande,
"Femtosecond Dynamics - Snapshots of the Early Ion-Track Evolution",
Nucl. Instr. Meth. B226, 683-704 (2004)