Harvard University Department of Physics

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Lyman 225
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Riverside, CA 92515
(951)785-2272 (office)

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Research Group

FACULTY

Horace Crogman

Assistant Professor of Physics
PhD 2004, University of Arkansas
Post-doctoral Fellow Institute Carnot Bourgogne Dijon (France), 2004-2006. Professor Crogman's primary interests are the Rotational Energy Surface of Molecules with high symmetry for their polyad states.

C60 is in a family of spherical top molecules that includes tetrahedral methane gas CH4, octahedral transformer dielectric SF6, and icosahedral 12C60, with the highest point symmetry semi-rigid molecules can have.

Unexplored quantum frame effects are possible for non-rigid molecules such as a CH4 or SF6 with any of its atoms replaced by a "pinwheel" molecule like a methyl CH3-group so that several quantum frames way either compete or else cooperate to make "super-frames.".

My work is related in many ways to the study of relative equilibria (RE), including those of vibrating and rotating molecules. RE are special periodic orbits of the system which go along the orbit of the group action of a dynamical or strict symmetry group.

My work now includes studying DNA strecting, of recent I have setup an optical tweezer to investigate varisous kind of motions in DNA strecting.

Selected Publications:

H. T. Crogman and L. Belliache, "Properties of Vacancy-rich Ordered(A,[])Nb2O6 Perorvshites. Phys. Rev. B. 66 220301 (2002)

H. T. Crogman and W. G. Harter, A Generalization of Frame Transformation Relations in a Coupled Rotor
System. J. Chem. Phys.121, 9297 (2004).

H. T. Crogman, V. Boudon, W. G. Harter and J. C. Mitchell, Deformation of Trifluoromethyl Sulfur
   Pentafloride and Spectral Analysis of the Degree of Floppiness. Mol. Phys. 104, 2781 (2006)

H. T. Crogman, V. Boudon, and D.A. Sadovskii, Local modes of silane within the   framework of
   stretching vibrational polyads EPJD 10(3),1140(2007)

H. T. Crogman, , A rotational energy surface study for low polyad structures of the general rovibrational
Hamiltonians. Mol. Phys. 108, (6) 705 (2010)

Grants:

Research Corporation Cottrell College Science Award, "ANALYSIS OF HIGHLY EXCITED VIBRATIONAL-ROTATIONAL STATES OF POLY ATOMIC MOLECULES IN TERMS OF CLASSICAL RELATIVE EQUILIBRIA," $49,000. (2010-2012)

CAS Grant Award "ANALYSIS OF HIGHLY EXCITED VIBRATIONAL-ROTATIONAL STATES OF TETRAHEDRAL MOLECULES AB4 IN TERMS OF CLASSICAL RELATIVE EQUILIBRIA," $2,000(2009-2010)

CAS Grant Award 3,000 (2008-2009)

Technical Presentation:

Poster Presentation: