Welcome to Wake Chemistry

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Salam Group Members

 
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Ryan Wagner
Jessica Freyer
Jessica Freyer
 

Former Group Members

Bridget Alligood
Currently Graduate Student at University of Chicago


Lisa Federico
Undergraduate Researcher
Graduated May 2006


Margaret Hurt
Undergraduate Researcher


Katarina Kesty
Wake Forest Undergraduate

Yuguang Ma
Postdoctoral Researcher
Currently at Texas A & M
University

Nikki Garcia
Undergraduate Researcher
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Aniket Deosthali
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Wes Farrell
Undergraduate Researcher
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Wesley Matthews (Undergraduate Researcher)

 
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Justo Rodriguez, Postdoctoral Fellow

 
Theoretical Chemical Physics


A fundamental description is sought of the properties of molecules, their mutual interaction, and their interaction with electromagnetic fields. Current and future research areas of interest include long-range intermolecular forces, single- and multi-photon absorption and emission processes, and molecular chirality.

Specific Research Programs

1. Molecular Quantum Electrodynamics
Radiation-molecule and molecule-molecule interactions are described completely quantum mechanically using quantum electrodynamics. In this microscopic treatment of electron-photon interactions, the time evolution of the dynamically coupled radiation-matter system is followed and quantum mechanical probabilities are evaluated for a variety of chemical and physical processes. New approaches within this framework are presently being developed to enable the facile computation of the energy shift due to higher multipole moment contributions to the retarded van der Waals dispersion force. Other applications of the formalism involve calculation of transfer rates arising from the resonance exchange of energy, and transition rates for chiroptical and nonlinear optical spectroscopies such as induced circularly polarized luminescence and two-centre two-photon circular dichroism.

Dr. Salam's Book

 

 

Molecular Quantum Electrodynamics: Long-Range Intermolecular Interactions - Akbar Salam, John Wiley & Sons, Inc., NJ, 2010.

 

Selected Publications

A. Salam, “Mediation of Resonance Energy Transfer by a Third Molecule”, J. Chem. Phys. 136, 014509 1-5 (2012).

A. Salam, “Molecular Quantum Electrodynamics of Radiation-Induced Intermolecular Forces”, Adv. Quant. Chem. 62, 1-34 (2011).

J. J. Rodriguez and A. Salam, “Effect of Medium Chirality on the Rate of Resonance Energy Transfer”, J. Phys. Chem. B115, 5183-5190 (2011). 

J. J. Rodriguez and A. Salam, “On the Influence of Nonlocal Molecular Vibrations and Charge Transfer on the Spectra of Aggregated Push-Pull Chromophores”, J. Chem. Phys. 134, 154512 (2011). 

J. J. Rodriguez and A. Salam, “Casimir-Polder Potential in a Dielectric Medium Out of Thermal Equilibrium”,Phys. Rev. A 82, 062522 1-6 (2010).

A. Salam  and D. A. Micha, “Photoinduced Quantum Dynamics in Molecules and at Adsorbates”, Molec. Phys. 108, 3223-3234 (2010). Invited Article.

J. J. Rodriguez and A. Salam, “On the Role of Dissipation on the Casimir-Polder Potential Between Molecules in Dielectric Media”, J. Chem. Phys. 133, 164501 1-8 (2010).

J. J. Rodriguez and A. Salam, “Influence of Medium Chirality on Electric Dipole-Dipole Resonance Energy Transfer”, Chem. Phys. Lett. 498, 67-70 (2010).

P. Fischer and A.Salam, “Molecular QED of Coherent and Incoherent Sum-frequency and Second-harmonic Generation in Chiral Liquids in the Presence of a Static Electric Field”, Molec. Phys. 108, 1857-1868 (2010).

A. Salam, “On the Manifestation of Casimir Effects in Intermolecular Interactions via the Method of Induced Moments”, J. Phys. Conf. Ser. 161, 012040 1-14 (2009).

A. Salam, “Molecular Quantum Electrodynamics in the Heisenberg Picture: A Field Theoretic Viewpoint”, Int. Rev. Phys. Chem. 27, 405-448 (2008).

A. Salam, "Two Alternative Derivations of the Static Contribution to the Radiation-Induced Intermolecular Energy Shift", Phys. Rev. A 76, 063402 1-5 (2007).

B. W. Alligood and A. Salam, "On the Application of State Sequence Diagrams to the Calculation of the Casimir-Polder Potential", Molec. Phys. 105, 395-404 (2007).

A. Salam, "A General Formula Obtained From Induced Moments for the Retarded van der Waals Dispersion Energy Shift Between Two Molecules With Arbitrary Electric Multipole Polarizabilities: I. Ground State Interactions", J. Phys. B: At. Mol. Opt. Phys. 39 , S651-S661 (2006).

A. Salam, "A General Formula Obtained From Induced Moments for the Retarded van der Waals Dispersion Energy Shift Between Two Molecules With Arbitrary Electric Multipole Polarizabilities: II. Excited State Interactions", J. Phys. B: At. Mol. Opt. Phys. 39 , S663-S669 (2006).

A. Salam, “Intermolecular Interactions in a Radiation Field via the Method of Induced Moments”, Phys. Rev. A 73, 013406 1-8 (2006).

A. Salam, “On the Effect of a Radiation Field in Modifying the Intermolecular Interaction Between Two Chiral Molecules”, J. Chem. Phys. 124, 014302 1-6 (2006).

A. Salam, “Generalized Expressions for Resonant Excitation Transfer and Retarded Dispersion Energy Shifts Obtained Using Multipolar Quantum Electrodynamics”, Int. J. Quantum Chem. 105, 762-766 (2005).

A. Salam, "Resonant Transfer of Excitation Between Two Molecules Using Maxwell
Fields", J. Chem. Phys. 122, 044113 1-7 (2005).

A. Salam, "A General Formula for the Rate of Resonant Transfer of Energy Between Two Electric Multipole Moments of Arbitrary Order Using Molecular Quantum Electrodynamics", J. Chem. Phys. 122, 044112 1-12 (2005).

A. Salam, "A Simple Route to the Energy Shift Between an Electrically Polarizable Molecule and a Magnetically Susceptible Molecule via the Electromagnetic Energy Density", Molec. Phys. 102, 797-800 (2004).

2. Semi-Classical Radiation Theory
In this viewpoint, only matter is treated quantum mechanically, with the electromagnetic field considered as an external classical perturbation. Analytical rotating-wave approximation expressions in addition to “exact” numerical methods for the solution of the time dependent Schrödinger equation in the presence of a periodic potential, are used to compute state probabilities and absorption spectra. These and other techniques will be used to extend and apply a theory of the control of the relative populations of an enantiomeric pair undergoing excitation by a circularly polarized pulsed laser, as well as the calculation of single- and multi-photon circular dichroism rates.

Selected Publications
Y. Ma and A. Salam, “Controlling State Populations of Enantiomers of Real Chiral Molecules by Using a Circularly Polarized Pulsed Laser”, Chem. Phys. Lett. 431, 247-252 (2006).

Y. Ma and A. Salam, “On Chiral Selectivity of Enantiomers Using a Circularly Polarized  Pulsed Laser Under Resonant and Off-resonant Conditions”, Chem. Phys. 324, 367-375 (2006).

Y. Ma and A. Salam, “Calculation of Electronic Circular Dichroism Spectra by Rotating Wave Approximation”, Chem. Phys. 324, 622-630 (2006).

3. Applications of Electronic Structure Theory
High-level methods of electronic structure theory as implemented in various quantum chemical software packages are being used to investigate the conformational equilibria of n-alkanes and keto-enol tautomerism in cyclic conjugated ketones.

Selected Publications
S. W. Paine and A. Salam, “A Computational Study of the Keto-Enol Equilibria of Sulphur Substituted Analogues of Hydroxycyclopropenone”, J. Mol. Struct. (THEOCHEM) 814, 105-112 (2007).

S. W. Paine and A. Salam, “Computational Study of Keto-Enol Equilibria of Tropolone in Gas and Aqueous Solution Phase”, Chem. Phys. 331, 61-66 (2006).

S. W Paine, A. J. Kresge, and A. Salam, “An Ab Initio and Density Functional Theory Study of Keto-Enol Equilibria of Hydroxycyclopropenone in Gas and Aqueous Solution Phase”, J. Phys. Chem. A 109, 4149-4153 (2005).