- Professor
- PSB 405
- 407-823-1543
- Haripada.Saha@ucf.edu
- Curriculum Vitae

Dr. Saha received his PhD in Physics from Calcutta University in 1978. He joined , Max-Planck-Institute for Physics and Astrophysics, Munich, Germany as a Max-Planck Post-doctoral fellow 1979-1981. He was a Research Specialist in University of Minnesota, Minneapolis for one year (1981-1982), and a Research Associate in Vanderbilt University, Nashville, 1982-1985. He worked as a Research Scientist for three years in Supercomputer Computations Research Institute, Florida State

University, Tallahassee before joining UCF in 1987 where he is a full Professor.

My research is directed towards understanding the fundamental details of the structure and dynamics of electrons within the atoms and molecules through theoretical analysis of the interaction of photons, electrons and positrons with individual atoms and molecules in the gas phase. Over the past twenty years some of the most productive activities in atomic physics research have been in the area of photoionization and collision processes which sample the dynamics associated with continuum wave functions (unbound states) of electrons. Experimental results have stimulated development of a number of new calculational techniques for describing these systems, with a particular view toward accounting for the electron correlation and core polarization associated with the motion of an electron in the field of other electrons. To date, none of these new methods have allowed for exploitation of the most accurate technique of description of bound state systems, the Multiconfiguration Hartree-Fock (MCHF) scheme, beyond its use as a starting point for “closed” portions of the wave function. As the MCHF technique incorporates electron configuration interaction in a way superior to other techniques, the extension of this scheme to include continuum wave functions is a problem of cardinal importance in atomic theory. The primary aim of my research is devoted to just this activity.

1. Proton-hydrogen collisions by the Faddeev approach

– **Haripada Saha**, J. Chowdhuri and N.C. Sil, Phys Rev A**14 **(1976) 2372-2378

2. Asymptotic cross section for the excitation of atomic hydrogen by proton and alpha particle impact

– **H.P. Saha** and B.C. Saha, Physics Letters**, 69A** (1978) 180-184

3. Evaluation of exchange matrix elements with momentum transfer for ion-atom collisions

– **H.P. Saha** and N.C. Sil, J. Phys. **B12** (1979) 585-594

4. Rearrangement collisions in highly excited states of atomic hydrogen

– N.C. Sil, B.C. Saha, **H.P. Saha** and P. Mandal, Phys. Rev. A**19** (1979) 655-674

5. Electron-impact excitation of atomic hydrogen into highly excited states

– B.C. Saha, **H.P. Saha** and N.C. Sil, J. Phys. Soc. Japan **47** (1979) 1634-1642

6. Electron capture in 3s level by proton and alpha-particle from atomic hydrogen

– **H.P. Saha**, N. Maiti and N.C. Sil, J. Phys B**13** (1980) 327-342

7. Asymptotic behavior of cross sections for the electron impact excitation of hydrogen atom into highly excited states

– B.C. Saha, **H.P. Saha** and N.C. Sil, Ind. J. Phys. **55**B (1981) 16-29

8. Electron impact excitation of Si X

– **H.P. Saha** and E. Trefftz , J. Phys. B**15** (1982) 1089-1104

9. Electron Collisional excitation of S XII

– **H.P. Saha** and E. Trefftz, Zeitscrift fur Naturforsch **37**a (1982) 744-751

10. Coronal line intensities for ions with Fine structured ground states: Si X

– **H.P. Saha** and E. Trefftz, Astron. and Astrophys. **116** (1982) 224-231

11. A theory of Laser induced Chemiionization I. Quantal formulation

– **H.P. Saha**, John S. Dahler and S.E. Nelson, Phys. Rev. A**28** (1983) 1487-1502

12. Calculations of coronal line intensities for Boron-like ions

– **H.P. Saha** and E. Trefftz, Solar Phys. **87** (1983) 233-242

13. A theory of Laser induced Chemiionization II. A semiclassical limit

– **H.P. Saha** and John S. Dahler, Phys. Rev. A**82** (1983) 2859-2867

14. Excitation of C II lines by Photoionization of neutral Carbon

– H. Hofmann, **H.P. Saha** and E. Trefftz, Astron. and Astrophys. **126** (1983) 415-426

15. Multiconfiguration Hartree-Fock results with Breit-Pauli corrections for forbidden transitions in the 2p^{4}

configuration

– C. Froese Fischer and **H.P. Saha**, Phys. Rev. A**28** (1983) 3169-3178

16. MCHF + BP results for electric dipole transitions in the Oxygen sequence

– C. Froese Fischer and **H.P. Saha**, J. Phys. B**17** (1983) 943-952

17. A theory of laser induced excitation transfer and atomic association

– **H.P. Saha**, John S. Dahler and Dumont M. Jones, Phys. Rev. A**30** (1984) 1345-1352

18. A theory of excitation transfer between Rydberg atoms

– **H.P. Saha** and T.F. George, Mol. Phys. **55** (1985) 173-186

19. Recent advances in the theory of Chemiionization

– **H.P. Saha**, Kai-shue-Lam and Thomas F. George, ‘ Gas-Phase Chemiluminiscence and Chemiionization’,

edited by A. Fontijn (North-Holland, Amsterdam ) 1985

20. Multiconfiguration Hartree-Fock results with Breit-Pauli corrections for transitions in the 2p^{2} configuration

– C. Froese Fischer and **H.P. Saha, ** Physica Scripta **32** (1985) 181-194

21. An extension of the multiconfiguration Hartree-Fock program for continuum functions

– C. Froese Fischer and **H. P. Saha,** Technical Report, 1983, DOE-ER-1061811, Vanderbilt University,

Nashville, Tennessee 37235

22. MCHF calculation of the Oscillator strength for the 2s2p ^{1}P^{o} –> 2p^{2}, 2snd ^{1}D (n=3-6) transitions in Beryllium

– **H.P. Saha** and C. Froese Fischer, Phys. Rev. A**35** (1987) 5240-5243

23. Photoionization of Magnesium

– C. Froese Fischer and **H. P. Saha**, Can. J. Phys. **65** (1987) 772-776

24. Multiconfiguration Hartree-Fock calculation of the photoionization of the excited Na 4d state

– **H.P. Saha**, M.S. Pindzola and R.N. Compton, Phys. Rev. A**38 **(1988) 128-134

25. Numerical multiconfigurational Hartree-Fock studies of Atomic photoionization cross sections: Dynamical

Core-Polarization effects in Atomic Sodium

– **H.P. Saha**, C. F. Fischer and P.W. Langhoff , Phys. Rev. A**38** (1988) 1279-1285

26. Multiconfiguration Hartree-Fock calculation for the Bound-Free Photodetachment Cross section of H-

– **H.P. Saha**, Phys. Rev. A**38** (1988) 4546-4551

27. Numerical multiconfiguration self-consistent field studies of Atomic photoionization Cross section:

Dynamical core polarization effects in Atomic Potassium

– **H.P. Saha**, Phys. Rev. A**39** (1989) 628-633

28. Threshold behavior of the M-shell photoionization of Argon

– **H.P. Saha**, Phys. Rev. A **39** (1989) 2456-2460

29. Low energy elastic scattering of electrons from neon atoms

– **H.P. Saha**, Phys. Rev. A **39 **(1989) 5048-5061

30. Accurate ab-initio calculation on low-energy elastic scattering of electrons from helium

– **H.P. Saha**, Phys. Rev. A **40** (1989) 2976-2990

31. K-shell photoionization of Beryllium

– **H.P. Saha** and C. D. Caldwell, Phys. Rev. A **40 **(1989) 7020-7025

32. Multiconfiguration Hartree-Fock calculation of the photoionization cross section of the Cs 7d excited state

– **H.P. Saha**, Phys. Rev. A **41** (1990) 174-180