Chris W. Harmon

My research interests are around heterogenous atmospheric chemistry. I’m interested in how small molecules adsorb to the surface of atmospheric aerosols and change their physical and chemical properties. Specifically, I am most interested in how volatile organic compounds (VOC) alter the ability of an aerosol to act as a cloud condensation nuclei (CCN) by forming an organic layer on the surface of an inorganic particle. In my laboratory we use the Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) technique as well as a custom manifold to quantify VOC/water up-take on powdered solids that serve as a proxy for atmospheric aerosols. The custom manifold can create a synthetic atmospheric environment that mimics Earth’s atmosphere and was built entirely by undergraduate students! My research philosophy is centered on putting students in the driver’s seat by allowing them to push buttons, turn wrenches, modify existing procedures, and collect significant data toward our research goals.

Specialty Area

Physical Chemistry, Atmospheric Chemistry, Aerosol Science

Education

Postdoctoral Research Assistant (2009-2011), The Advanced Light Source at Lawrence Berkeley National Laboratory, Berkeley, CA
Ph.D. Physical Chemistry (2009), University of California, Irvine
BS Chemistry (2004), Purdue University, West Lafayette, IN

Courses Taught

General Chemistry (CHEM 109 & 110)
Physical Chemistry (CHEM 361, 362, & 363)
Seminar in Chemistry (CHEM 485)

Publications

Cal Poly Humboldt undergraduate student authors indicated with *
12.  Christopher W. Harmon, "Measurement of the Joule-Thomson Coefficient of Nitrogen and Carbon Dioxide to Demonstrate LabVIEW, Electronic Data Acquisition, and Experimental Design." J. Chem. Ed., 2024, doi.org/10.1021/acs.jchemed.3c00849

 

11. André, John S.*; Eskandary, Natalie*; Franklin, Terry*; McCann, Emilia J*.; Pascual-Diaz, Oscar*; Pitch, Gregory M.*; Rincon, Jesus D.*; Wright, Megan N.*; and Harmon, Christopher W. (2020) "Preliminary Quantitative and Qualitative Investigations on the Heterogeneous, Irreversible Uptake of Acetone by Titanium(IV) Oxide," IdeaFest: Interdisciplinary Journal of Creative Works and Research from Humboldt State University: Vol. 4 , Article 6. Available at: https://digitalcommons.humboldt.edu/ideafest/vol4/iss1/6

10. Gregory M. Pitch*, John S. Andre*, Arion J. Davie*, Christopher W. Harmon, “Investigations of Water Uptake on Sodium Acetate Trihydrate And Nonhydrate as Model Aerosol Surfaces Using the DRIFTS and ATR-FTIR Techniques”, Proceedings of the National Conference for Undergraduate Research (NCUR), 2015, Eastern Washington University, Cheney, WA

9. Cody Hill*, Andreas Geyer*, Cody Tripp*, Christopher W. Harmon, “Development of a Multi-purpose Electrospray,-Electron Impact Tandem Mass Spectrometer,” Proceedings of the National Conference for Undergraduate Research (NCUR), 2014, University of Kentucky, Lexington, KY

8. Christopher W. Harmon, Christopher R. Ruehl, Christopher D. Cappa, and Kevin R. Wilson, “ A Statistical Description of the Evolution of Cloud Condensation Nuclei Activity During the Heterogeneous Oxidation of Squalane and Bis(2-ethylhexly) sebacate aerosol by Hydroxyl Radicals,” Phys. Chem. Chem. Physics 2013 DOI: 10.1039/C3CP50347J

7. Amanda C. MacMillan, John B. Morrison, Christopher W. Harmon, and Sergey A. Nizkorodov, "Enhancement of Surfactants in Nanoparticles Produced by an Electrospray Aerosol Generator” Aero. Sci. & Tech., 2012, 46 (11), 1239-1245

6. Christine J. Koh, Chen-Lin Liu, Christopher W. Harmon, Daniel Strasser, Amir Golan, Oleg Kostko, Steven D. Chambreau, Ghanshyam L.Vaghjiani, and Stephen R. Leone, “Soft Ionization of Thermally Evaporated Hypergolic Ionic Liquid Aerosols,” J. Phys. Chem. A. 2011, DOI:10.1021/jp200633b,

5. Christopher W. Harmon, Ronald L. Grimm, Theresa M. McIntire, Mark D. Peterson, Bosiljka Njegic, Vanessa M Angel, Ahmad Alshawa, Joelle S. Underwood, Douglas J. Tobias, R. Benny Gerber, Mark S. Gordon, John C. Hemminger, and Sergey A. Nizkorodov, “Hygroscopic Growth and Deliquescence of NaCl Nanoparticles Mixed with Surfactant SDS,” J. Phys. Chem. B 2010, 114, 2435-2449

4. Christopher W. Harmon, Steve A. Mang, John Greaves and Barbara J. Finlayson-Pitts, “Identification of Fatty Acids, Phospholipids, and Their Oxidation Products using Matrix Assisted Laser Desorption Ionization Mass Spectrometry andv Electrospray Ionization Mass Spectrometry,” J. Chem. Ed. 2010, vol. 87 No. 2, 186-189

3. Ahmad Alshawa, Otto Dopfer, Christopher W. Harmon, Sergey A. Nizkorodov and Joelle S. Underwood “Hygroscopic Growth and Deliquescence of NaCl Nanoparticles Coated with Surfactant AOT,” J. Phys. Chem. A. 2009, 113. 7678-7686

2. Yong Yu, Michael J. Ezell, Alla Zelenyuk, Dan Imre, Liz Alexander, John Ortega, Barbara D'Anna, Chris W. Harmon, Stanley N. Johnson and Barbara J. Finlayson-Pitts “Photooxidation of α-pinene at High Relative Humidity in the Presence of Increasing Concentrations of NOx” Atmos. Envirn. 2008, DOI: 10.1016/j.atmosenv

1. Yong Yu, Michael J. Ezell, Alla Zelenyuk, Dan Imre, Liz Alexander, John Ortega, Jennie L. Thomas, Karun Gogna, Douglas J. Tobias, Barbara D'Anna, Chris W. Harmon, Stanley N. Johnson and Barbara J. Finlayson-Pitts “Nitrate Ion Photochemistry at Interfaces: A New Mechanism for Oxidation of α-pinene,” Phys. Chem. Chem. Physics 2008, DOI: 10.1039/b719495a