J. Charles Williamson

Professor of Chemistry, Taul Watanabe Chair in the Sciences
Specialty: Physical Chemistry

Image of J. Charles Williamson

Contact Information

Olin Science Center 312
900 State Street
Salem  Oregon  97301


  • PhD, California Institute of Technology
  • BS, Harvey Mudd College


Many pairs of liquids are partially miscible: the liquids mix completely at some compositions and temperatures, but separate into two immiscible layers at other compositions and temperatures. Research in my laboratory centers on the characterization of partially-miscible liquid-liquid systems that have critical points. A variety of experimental techniques are employed to do this, including elastic laser light scattering, Raman spectroscopy, nuclear magnetic resonance spectroscopy, and gas chromatography / mass spectrometry. Of current particular interest is the impact of third component "impurities" on the critical temperatures and the critical compositions of liquid-liquid systems.


CHEM 115 - General Chemistry I

CHEM 115Y - General Chemistry I Laboratory

CHEM 116 - General Chemistry II

CHEM 116Y - General Chemistry II Laboratory

CHEM 321 - Physical Chemistry I

CHEM 321Y - Physical Chemistry I Laboratory

CHEM 322 - Physical Chemistry II

CHEM 344W - Experimental Chemistry I

CHEM 346W - Experimental Biochemistry I

CHEM 344Y - Experimental Chemistry I Laboratory

CHEM 495 - Senior Research Projects I

CHEM 496Y - Senior Research Projects II Laboratory


“The Sweetness of Aspartame: Introducing Key Statistical Concepts in an Upper Division Bioanalytical Laboratory Project” J. C. Williamson and T. P. Silverstein. Under review at the Journal of Chemical Education. August, 2020.

“Liposome Permeability Probed By Laser Light Scattering” T. P. Silverstein and J. C. WilliamsonBiochem. Mol. Biol. Educ47(3), 239-246 (2019).

“Determination of Liquid-Liquid Critical Point Composition Using 90° Laser Light Scattering” J. C. Williamson, Allison M. Brown*, Elise N. Helvie*, and Kevin M. Dean*, Phys. Rev. E, 93, 042610 (2016).

“A Molecular Iodine Spectral Data Set for Rovibronic Analysis” J. C. Williamson, T. S. Kuntzleman, and R. A. Kafader*, J. Chem. Educ., 90(3), 383-385 (2013).

“Molecular Iodine Fluorescence Using a Green Helium-Neon Laser” J. C. Williamson, J. Chem. Educ., 88(6), 816-818 (2011). 

“The Stir-Settle Approach to Semiautomated Light Scattering Determination of Liquid-Liquid Coexistence Curves” K. M. Dean* and b, J. Chem. Eng. Data, 56(4), 1433-1437 (2011).

“Molecular Iodine Fluorescence Spectra Generated from Helium-Neon Lasers for Spectrometer Calibration” J. C. Williamson, Appl. Spectrosc., 64(12), 1419-1422 (2010).

“The Accuracy of Liquid-Liquid Phase Transition Temperatures Determined from Semiautomated Light Scattering Measurements” K. M. Dean*, C. B. Babayco*, D. R. B. Sluss*, and J. C. Williamson, J. Chem. Phys. 133, 074506 (2010).

“Subwavenumber Charge-Coupled Device Spectrometer Calibration Using Molecular Iodine Laser-Induced Fluorescence” J. G. Lambert*, C. Hernandez-Diaz*, and J. C. Williamson, Rev. Sci. Instrum. 81, 013110 (2010). 

“Interactive Two-Component Phase Diagrams” J. C. Williamson, J. Chem. Educ. 86(5), 653-654 (2009).

“Teaching the Rovibronic Spectroscopy of Molecular Iodine” J. C. Williamson, J. Chem. Educ. 84(8), 1355-1359 (2007).


Taul Watanabe Chair in the Sciences (2018)

Jerry E. Hudson Award for Outstanding Teaching (2016)

ACS Petroleum Research Fund Undergraduate Research Grant (2015-2018)

Willamette University

Department of Chemistry

900 State Street
Salem Oregon 97301 U.S.A.
503-370-6013 voice
503-375-5425 fax

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