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Roger F. Loring


Baker Laboratory, Room 218

Educational Background

  • Postdoc, University of Rochester
  • PhD, Stanford University
  • BS, University of California, Davis


The Loring Group develops statistical mechanical methods to study molecular motions and dynamical processes including reaction kinetics, transport, and spectroscopy.


Nonequilibrium statistical mechanics, dynamical processes in liquids, nonlinear spectroscopy


  • Chemistry and Chemical Biology

Graduate Fields

  • Applied Mathematics
  • Biophysics
  • Chemistry and Chemical Biology
  • Computational Science and Engineering


The dynamics of molecules in condensed phases control phenomena ranging from biological processes to the course of liquid phase chemical reactions to the mechanical properties of materials. Our group develops theoretical methods for interpreting and predicting the motions of both small molecules and macromolecules in the liquid state. A principal research area is the development of semiclassical approximations to quantum mechanics that can be applied to the interpretation of multidimensional infrared spectroscopy of biomolecules.



Loring, R. F. "Mean-trajectory approximation for electronic and vibrational-electronic nonlinear spectroscopy,” J. Chem. Phys. 2017, 146, 144106.

Loring, R. F. "Lattice model of spatial correlations in catalysis," J. Chem. Phys.,  2016, 145, 134508.

Moberg, D. R.; Alemi, M. ; Loring, R. F.  "Thermal weights for semiclassical response functions," J. Chem. Phys. 2015, 143, 084101.

Alemi, M. ; Loring, R. F.  "Vibrational coherence and energy transfer in two-dimensional spectra with the optimized mean-trajectory approximation," J. Chem. Phys,  2015, 142, 212417.

Alemi, M. ; Loring, R. F. "Two-dimensional vibrational spectroscopy of a dissipative system with the optimized mean-trajectory approximation," J. Phys. Chem. B  2015, 119, 8950-8959.

Lekkala, S.; Marohn, J. A.; Loring, R. F. " Electric force microscopy of semiconductors: cantilever frequency fluctuations and noncontact friction," J. Chem. Phys. 2013, 139, 184702.

Ochoa, M. A.; Chen, P.; Loring, R. F. " Single turnover measurements of nanoparticle catalysis analyzed with dwell time correlation functions and constrained mean dwell times," J. Phys. Chem. C  2013,  117, 19074-19081. 

Gerace, M.; Loring, R. F. "Two-dimensional spectroscopy of coupled vibrations with the optimized mean-trajectory approximation,"  J. Phys. Chem. B 2013, 117, 15452-15461. 

Gerace, M.; Loring, R. F. "An optimized semiclassical approximation for vibrational response functions," J. Chem. Phys. 2013, 138, 124104.

Lekkala, S. ; Hoepker, N. ; Marohn, J. A. ; Loring, R. F. "Charge carrier dynamics and interactions in electric force microscopy, " J. Chem. Phys. 2012, 137, 124701.

Ochoa, M. A.; Zhou, X.; Chen, P.; Loring, R. F. "Interpreting single turnover catalysis measurements with constrained mean dwell times, " J. Chem. Phys., 2011, 135, 174509.

Hoepker, N. ;  Lekkala, S.; Loring, R. F. ; Marohn, J. A. "Dielectric fluctuations over polymer films detected using an atomic force microscope, "  J. Phys. Chem. B, 2011, 115, 14493-14500.

Gruenbaum, S. M.; Loring, R. F. "Semiclassical quantization in Liouville space for vibrational dynamics," J. Phys. Chem. B, 2011, 115,  5148–5156.

Bagchi, S.; Nebgen, B. T.; Loring, R. F.; Fayer, M. D. "Dynamics of a Myoglobin Mutant Enzyme: 2D IR Vibrational Echo Experiments and Simulations, J. Am. Chem. Soc. 2010, 132, 18367-18376.

Gruenbaum, S. M.; Loring, R. F. "Semiclassical nonlinear response functions for coupled anharmonic vibrations," J. Chem. Phys., 2009, 204504.

Yazdanian, S. M.; Hoepker, N.; Kuehn, S.; Loring, R. F. ; Marohn, J. A."Quantifying electric field gradient fluctuations over polymers using ultrasensitive cantilevers," Nano Lett.2009, 9, 2273-2279.

Gruenbaum S.M.; Loring, R. F. “Semiclassical Mean-Trajectory Approximation for Nonlinear Spectroscopic Response Functions,” J. Chem. Phys.2008,129, 124508.

Yazdanian, S. M.; Marohn, J. A.; Loring, R. F. "Dielectric fluctuations in force microscopy: Noncontact friction and frequency jitter," J. Chem. Phys. 2008, 128, 224706.

Gruenbaum, S. M.; Loring, R. F.; "Interference and quantization in semiclassical response functions," J. Chem. Phys. 2008, 128, 124106.

Goj, A.; Loring, R. F.; Comment on "Ultrafast dynamics of myoglobin without the distal histidine: vibrational echo experiments and molecular dynamics simulations," J. Phys. Chem. B, 2007, 111, 12938.

Goj, A.; Loring, R. F.; Dephasing Dynamics in Confined Myoglobin, Chem. Phys., 2007, 341, 37.

Kuehn, S.; Marohn, J. A.; Loring, R. F.; Noncontact Dielectric Friction, J. Phys. Chem. B, 2006, 110, 14525.

Goj, A. ; Loring, R. F.; Effect of Noise on the Classical and Quantum Mechanical Nonlinear Response of Resonantly Coupled Anharmonic Oscillators, J. Chem. Phys., 2006, 194101.

Kuehn, S.; Loring, R. F.; Marohn, J. A. Dielectric Fluctuations and the Origins of Noncontact Friction, Phys. Rev. Lett. 2006, 156103.

Massari, A. M ; Finkelstein, I. J.; McClain, B. L.; Goj, A.; Wen, X.; Bren, K. L.; Loring, R.F.; Fayer, M. D.
The Influence of Aqueous versus Glassy Solvents on Protein Dynamics: Vibrational Echo Experiments and Molecular Dynamics Simulations. J. Am. Chem. Soc., 2005, 127, 14279.

Finkelstein, I. J.; Goj, A.; McClain, B.L.; Massari, A. M.; Merchant, K. A.; Loring, R.F.; Fayer, M. D.Ultrafast Dynamics of Myoglobin without the Distal Histidine: Stimulated Vibrational Echo Experiments and Molecular Dynamics Simulations. J. Phys. Chem. B, 2005, 109, 16959.