ASHISH K. GUPTA

Permanent address	Mailing Address
Agrawal Farm, Mansarovar	Department of Chemistry,
Jaipur, Rajasthan 302020	Indian Instite of Technology, Guwahati
India.	North Guwahati, Assam 781039, India.
Phone: 0091-141-2395364	(91)-361-258-2312
Fax:	(91)-361 2690762   (Institute)

email:gupta@iitg.ernet.in

EDUCATION

• Ph.D., Chemistry, University of California, Los Angeles, USA, March 2001, GPA 3.894/4.
• M.Sc. (Integrated 5 year program), Indian Institute of Technology, Bombay, India, July 1995, CPI 6.74/10.
• Sr. Hr. Secondary, Mathematics, Rajasthan Board, Mahavir School, Jaipur, Rajasthan, June 1990, Marks 62%, 1st Division.
• Hr. Secondary, Mathematics, Rajasthan Board, Rajasthan School, Jaipur, Rajasthan, June 1989, Marks 66%, 1st Division.
• Secondary, Mathematics, Rajasthan Board, Government Hr. Sec. School, Baseri, Dist Dholpur, Rajasthan, June 1988, Marks 72%, 1st Division.
  

EXPERIENCE

• Assistant Professor
  Indian Institute of Technology, Guwahati, North Guwahati, Assam, May 2004 to present.
• lecturer
  Birla Institute of Technology and Science Pilani, Rajasthan, October 2003 to May 2004.
• Post Doctoral Research
  Department of Chemistry, Technion, Haifa, Israel, April 2001 to September 2003
  Supervisor: Professor Nimrod Moiseyev
  Harmonic generation control: Investigated the effect of symmetry of the material on the emitted light. Demonstrated the possibility to control the generation of high-order harmonics by a thin layer of graphite (having C symmetry where N=6) upon varying the polarization and intensity of the laser field. While for monochromatic linearly-polarized laser fields all odd-order harmonics are emitted, for circular-polarized laser the selection rule for harmonics frequency , is followed, where is the frequency of the incoming laser. We find that even for very large deviations from exact circular polarization the selection rule is valid.
• Graduate Research
  Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA, September 95 to March 2001
  Supervisor: Professor Daniel Neuhauser
  Harmonic generation control: Investigated the effect of vibrational degrees of freedom on harmonic generations. Showed that harmonic generation can be controlled efficiently by preparing the molecule in a coherent initial state.

  Effect of the dense sample of molecules on the harmonic generation: Investigated the harmonic generation of multi-molecular system by solving the coupled Schroedinger and Maxwell equations. The emission enhancement was observed to be an order of four greater than the maximum emission one would expect due to the simple addition of individual emissions. The molecules co-operate to produce higher and higher harmonics. The preceding molecule introduces high frequency component in the propagating field which in turn felt by the following molecule which introduce even higher harmonics in the propagating field and so on.

  Auxiliary-Field Monte Carlo method for electronic structure calculation: The full quantum chemistry problem is transformed into an "ensemble" of problems in which the electrons are independent of each other. The transformation is exact.The attractiveness of this approach is its slow scaling of the numerical effort.

  Wrote the following routines for efficient propagation of time dependent Schroedinger equation: split operator propagation routine, Cheby-chev propagation routine using Bessel functions, routine using Fourier grid method for the representation of the molecular Hamiltonian and routine using Floquet theorem.
  

• Graduate Teaching
  Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA, September 95 to March 2001
  Taught undergraduate and graduate courses in quantum chemistry, thermodynamics, statistical mechanics and general chemistry. Received very good-to-excellent teaching evaluations for all courses.
  
• M.Sc. Research Project
  Supervisor: Professor Manoj Kumar Mishra
  Indian Institute of Technology, Bombay, India, April 94 to June 95
  Initial state control: Maximized the branching ratio for a given electric field by preparing the molecule in a initial state i.e., a combination of ground and excited vibrational states. Also investigated the lifetime of different vibrational levels using time dependent methods and also complex scaled Hamiltonian time independent method.
  
• Summer Research Fellow
  Tata Institute of Fundamental Research, Bombay, India, April 94 to August 94
  Supervisor: Dr. Peter Gross, Prof V. R. Marathe
  Parametric equations of motion: solved the time dependent Schroedinger equation using parametric equations of motion in order to study the wavefunction dynamics separately as a function of each laser field parameter (amplitude, phase and frequency of the external laser field). This method is found to be two orders of magnitude faster than the traditional approach.
• Summer Research Project
  Indian Institute of Technology, Bombay, India, April 93 to June 93
  Supervisor: Professor B. L. Tambe
  AB-initio Calculation: Re-derived all the integrals for s,p,d type orbitals and wrote a program to do AB-initio calculation for molecule.
  

EXTRA CURRICULAR ACTIVITIES

• Bhartiyam club at UCLA
  Founding Vice President, April 1997 to April 1999
  Club was started to represent Indian Graduate students at UCLA. Main objective was to help new students feel at home. Main activities included providing all possible help to new students from India. Organized social events, main festivals of india and screening of 1999 cricket world cup. It was an exhilarating learning experience to start an organization and help it mature.
• Yoga Club
  President, August 1995- August 1997
  Yoga is usually refer to sitting in a difficult posture. The club provided simulating discussions on the philosophical side. Organized discussions, provided logistic support, invited guest speakers and organized a "Mela" on campus
  

STRENGTHS

• Strong problem solving skills. Ability to work independently as well as collaborate and work as a team.
  

SKILLS

• Extensive knowledge and use of modern method for solving time dependent Schroedinger equation for electronic calculations and light-matter interaction. Scientific programming in FORTRAN 77, FORTRAN 90, C, Pascal. System administration for UNIX (DEC, SUN) and LINUX Platforms.
  

HONORS/AWARDS

• Aly Kaufman Fellowship for Post doctoral work, Technion, Israel (2000)
• Visiting student research fellow, Summer Scholarship, Tata Institute of Fundamental Research (1994)
• Gramin Pratibha Khoj (Village talent Search Scholarship), Rajasthan 1987.

REFERENCES (available on request)

• Prof. Daniel Neuhauser, Dept of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095-1569, USA
  Tel: 310-206-1274, Fax: 310-206-4038, email: dxn@chem.ucla.edu
  
• Prof. Manoj K. Mishra, Dept of Chemistry, Indian Institute of Technology, Mumbai 40076, India
  Tel: (091)22-5767158, Fax: (091)22-5767152, email: mmishra@chem.iitb.ernet.in
  
• Prof. Nimrod Moiseyev, Department of Chemistry, Technion - Israel Institute of Technology, Technion City, Haifa 32000, Israel
  Telephone:(972-4)8293727/3664, fax: (972-4)8233735, e-mail: nimrod@techunix.technion.ac.il
  

PUBLICATIONS

1. A. Fleischer, A. K. Gupta, and N. Moiseyev, Symmetry properties of high-order harmonics generation and intense-field ionization in bichromatic laser field, In preparation.

2. A. K. Gupta, and N. Moiseyev, Quantum correlation between high-order harmonics generation spectra of thin layer Graphite and the entropy of the corresponding Floquet state, In preparation.

3. I. Baldea, A. K. Gupta, N. Moiseyev and L. S. Cederbaum, High Harmonic Generation by Quantum-Dot Nanorings, Phys. Rev. B., V69, 245311, (2004).

4. A. K. Gupta, O. E. Alon and N. Moiseyev, Generation and control of high-order harmonics by the interaction of microwave/infrared laser with a thin graphite layer, Phys. Rev. B, V68, 205101, (2003).

5. A. K. Gupta and D. Neuhauser, Rabi-Oscillations Induced Multiharmonic Emission in a Maxwell-Schroedinger Study of a Dense Sample of Molecules, International J. Quant. Chem. V81, 260 (2001),

6. N. Rom, E. Fattal, A. K. Gupta, E. A. Carter and D. Neuhauser, Shifted-contour auxiliary-field Monte Carlo for molecular electronic structure, J. Chem. Phys., V109, 8241 (1998).

7. A. K. Gupta and D. Neuhauser, Control of harmonic generation by initial-state preparation, Chem. Phys. Letts, V290, 543 (1998).

8. A. K. Gupta, P. Gross, D. B. Bairagi and M. K. Mishra, Laser Control of Population Dynamics with Bichromatic Fields - Direct Search Through Field Amplitude, Frequency, and Phase space, Chem. Phys. Letts, V257, 658 (1996).

9. P. gross, A. K. Gupta, D. B. Bairagi and M. K. Mishra, Initial State Laser Control of Curve-Crossing Reactions Using the Rayleigh-Ritz Variational Procedure, J. Chem. Phys., V104, 7045 (1996).

10. D. B. Bairagi, A. K. Gupta, P Gross and M. K. Mishra, Investigation of Photodynamics in Intense Laser Fields Using the Fourier Grid Floquet Propagator with Applications to and LiH, Theochem-Journal of Molecular Structure, v361, 69 (1996).

11. P. Gross, A. Gupta, D. B. Bairagi and M. K. Mishra, An Efficient Method for Determining Quantum Dynamics in Strong Fields by Integrating through Amplitude and Frequency Parameter Space, Chem. Phys. Letts, V236, 8 (1995).

PRESENTATIONS

1. Invited speaker at Symposium on Theoretical Chemistry, Bhabha Atomic Research Center, Trombay, Mumbai, India.
   Ashish K Gupta, "High Harmonic Generation by Quantum-Dot Nanorings", Proceedings of Symposium on Theoretical Chemistry, IT-57, December 9-12,2004.
2. Lecture at UGC Refresher Course on Theoretical and Computational Chemistry, Birla Institute of Technology and Science, Pilani, Raj., India. December 8-28, 2003.[ Control of Molecular Dynamics using Intense Laser: Pump and Dump Scheme (Tannor-Rice Scheme).
3. Lecture at UGC Refresher Course on Theoretical and Computational Chemistry, Birla Institute of Technology and Science, Pilani, Raj., India. December 8-28, 2003. Control of Molecular Dynamics using Intense Laser: Stimulated Raman Scattering involving Adiabatic Passage (StiRAP) Control.
4. Lecture at UGC Refresher Course on Theoretical and Computational Chemistry, Birla Institute of Technology and Science, Pilani, Raj., India. December 8-28, 2003. Control of Molecular Dynamics using Intense Laser: The Fourier Grid representation of Wavefunction and Time Propagation Schemes.
5. Invited speaker at Minerva Meeting of Semi-classical, Quantum Chaos, And Mesoscopics, Max-Planck-Institute For Physik Komplexer Systeme, Dresden, Germany, January 29 - February 2, 2003.
6. Poster presented at Israel Theochem 2002, Jerusalem, Israel.
7. Departmental Seminar at Indian Institute of Technology, Bombay, India on 3rd December 2001. Generation of High energy Photons due to the Interaction of IR to UV lasers with Benzene, Graphite and Carbon Nanotubes.
8. Departmental Seminar at Indian Institute of Technology, Kanpur, India on 22nd November 2001. Generation of High energy Photons due to the Interaction of IR to UV lasers with Benzene, Graphite and Carbon Nanotubes.
9. Poster presented at Seminar of the Minerva Center for Nonlinear Physics of Complex Systems, Mizpe Hayamim, Israel.
10. Poster presented at TSRP-2000, Bhabha Atomic Research Center, Trombay, Mumbai, India.
    A. K. Gupta and D. Neuhauser, A Solution of the Combined Maxwell-Schroedinger Equation for Multiharmonic Emission from a Dense Sample of Molecules, Proceedings of Trombay Symposium on Radiation and Photochemistry, V2, 259 (2000).
11. Poster presented at Gordon Research Conference on Laser Interactions with Materials, Proctor Academy, New Hampshire, USA.
12. Poster presented at Gordon Research Conference on Quantum Control of Atomic and Molecular Motion, Plymouth State College, Plymouth, New Hampshire, USA.