麻豆果冻传媒

Associate Professor

Department of Chemistry

TN Tech University

Campus Box 5055

803 Stadium Dr.

Lab Science Commons, Rm 2317

Cookeville, TN 38505-0001

P:  (931) 372-3499

E:  wgichuhi@tntech.edu

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Education:

• University of Nairobi, Kenya, Chemistry, B.S. 2001
• University of Nairobi, Kenya, MS in Environmental Chemistry, 2002-2005
• Wayne State University, Detroit, Physical Chemistry, Ph.D. 2011
• JILA and University of Colorado, Boulder, Post-doc 2011-2015

Atmospheric Chemistry

Atmospheric spectroscopy of reactive and non-reactive trace gases in the atmosphere using infrared and Cavity Enhanced Spectroscopic Techniques.

 

Negative Ion Photoelectron Spectroscopy of Polycyclic Aromatic Hydrocarbon Anions

Negative Ion Photoelectron Spectroscopy of aromatic radical anions that are of interest to Astrochemistry, Environmental, and Biological systems. These studies have utilized high-level quantum chemical methods and Franck-Condon computations to obtain the vibrational spectra of neutral, medium-sized, polycyclic aromatic hydrocarbon radicals. New directions in this project involve the use of electroanalytical experimental methods to understand radical anions in the solution phase as well as the development of Velocity Map Ion Imaging technique.

Publications:

1. White, N. J.; Vargas, L. A.; Tunstall, W. W.; Koku Hannadige Abeysooriya, D. N.; Gichuhi, W. K., Cyanonaphthalene and cyanonaphthyl radicals: Vibrational structures via computed negative ion photoelectron spectra and thermochemistry of 1- and 2-cyanonaphthalene. J. Chem. Phys. 2024, 161 (3).
2. Abeysooriya, D. N. K. H.;  White, N. J.;  Workman, K. T.;  Dupuy, J. A.; Gichuhi, W. K., Cyanocyclopentadiene-Annulated Polycyclic Aromatic Radical Anions: Predicted Negative Ion Photoelectron Spectra and Singlet-Triplet Energies of Cyanoindene and Cyanofluorene Radical Anions. J. Phys. Chem. A 2024.
3. Workman, K. T.;  Usher, A. J.;  Henson, D. W.;  White, N. J.; Gichuhi, W. K., "Predicted Negative Ion Photoelectron Spectra of 1-, 2-, and 9-Cyanoanthracene Radical Anions and Computed Thermochemical Values of the Three Cyanoanthracene Isomers." J. Phys. Chem. 2023.Publication Date: April 28, 2023,
4. Workman Kie, T.; Firth, Rebecca. A.; and Gichuhi W.K. 鈥淔rom Benzonitrile to Dicyanobenzenes: The Effect of an Additional CN Group on the Thermochemistry and Negative Ion Photoelectron Spectra of Dicyanobenzene Radical Anions鈥欌�� J. Phys. Chem. A 2023, 127, 1, 181鈥�194.
5. Gichuhi Wilson K, and Gamage Lahiru, P.; "Efficacy of the CO Tracer Technique in Partitioning Biogenic and Anthropogenic Atmospheric CO2 Signals in the Humid Subtropical Eastern Highland Rim City of Cookeville, Tennessee." Atmosphere 2023, 14(2), 208.
6. Firth, Rebecca. A.; Dimino, T. L.; Gichuhi, W. K., "Negative Ion Photoelectron Spectra of Deprotonated Benzonitrile Isomers via Computation of Franck鈥揅ondon Factors." J. Phys. Chem. A. 2022, 126, (29), 4781-4790.
7. Gamage, Lahiru, P.; Hix, Elijah G.;and Gichuhi W.K. 鈥淕round-Based Atmospheric Measurements of CO:CO2 Ratios in Eastern Highland Rim Using a CO Tracer Technique,鈥� ACS Earth Space Chem. 2020, 4(4), 558鈥�571.
8. Gichuhi W.K. 鈥淎strochemistry as a Gateway to Teaching and Learning Threshold Concepts in Physical Chemistry,鈥� World Journal of Chemical Education. 2019, 7(3), 209鈥�215. DOI: 10.12691/wjce-7-3-4
9. Gamage Lahiru P.; and Gichuhi W.K. 鈥淓fficacy of a Wavelength-Scanned Cavity Ring-Down Spectroscopic Technique in Estimating Enteric Methane Emissions in Ruminants,鈥� ACS Earth Space Chem., 2018, 2(7), pp 673鈥�68.
10. Nelson, D.J, Gichuhi, W.K., Nichols, C.M., Bierbaum, V.M, Lineberger, W.C, and Lehman J.H. 鈥淧hotoelectron Spectroscopy and Thermochemistry of o-, m-, and p-Methylenephenoxide Anions,鈥� Phys. Chem. Chem. Phys., 20(39), 25203-25216, 2018. DOI: DOI: 10.1039/c8cp05403g
11. Nelson, D.J., Gichuhi, W.K., Miller, E., and Lineberger, W.C. 鈥淎nion Photoelectron Spectroscopy of Deprotonated ortho-, meta-, and para-Methylphenol,鈥� Journal of Chemical Physics, 146(6), 074302, 2017. DOI:
12. Gichuhi, W.K., and Suits, A.G. 鈥淟ow-Temperature Branching Ratio for the Reaction of State-Prepared N2+ with Acetonitrile,鈥� J. Phys. Chem A, 116(3), 938, 2012.
13. Gichuhi, W.K., and Suits, A.G. 鈥淧rimary Branching Ratios for the Low Temperature Reaction of State-Prepared N2+ with CH4, C2H2 and C2H4,鈥� J. Phys. Chem. A, 115(25), 7105, 2011.
14. Gichuhi, W.K., Mebel, A.M., and Suits, A.G. 鈥淯V Photodissociation of Ethylamine Cation: A Combined Experimental and Theoretical Investigation,鈥� J. Phys. Chem. A 114, 51, 13296: cover for the December 30, 2010, 114,51 issue.
15. Suits, A.G., Gichuhi, W.K., and Mebel, A.M. General Discussion; Faraday Discuss. 146.
16. Suits, A.G., Gichuhi, W.K., Silva, R., Doyle, M.B., Mebel, A.M., and Kaiser, R.I. 鈥淟aboratory Studies of Primary Photochemistry Relevant to Titan鈥檚 Atmosphere,鈥� LPI Contribution No. 1538, 5283.
17. Huang, C., Zhang, F., Kaiser, R.I., Kislov, V.V., Mebel, A.M., Silva, R., Gichuhi, W.K., and Suits, A.G. 鈥淧hotodissociation of the Diacetylene Dimer and Implications for Hydrocarbon Growth in Titan鈥檚 Atmosphere,鈥欌�� Astrophysical Journal, 714, 1249, 2010.
18. Silva, R., Gichuhi, W.K., Kislov, V.V., Mebel, A.M., and Suits, A.G., 鈥淯V 鈥淧hotodissociation of Cyanoacetylene: A Combined Ion Imaging and Theoretical Investigation,鈥� J. Phys. Chem. A, 113(42), 11182鈥�11186, 2009.
19. Silva, R., Gichuhi, W.K., Doyle, M.B., Winney, A.H., and Suits, A.G. 鈥淧hotodissociation of Heptane Isomers and Relative Ionization Efficiencies of Butyl and Propyl Radicals at 157 nm,鈥� Phys. Chem. Chem. Phys., 11, 4777-4781, 2009.
20. Silva, R., Gichuhi, W.K., Huang, C., Doyle, M.B., Kislov, V.V., and Mebel, A.M., and Suits, A.G. 鈥淗-elimination and Metastable Lifetimes in the UV Photoexcitation of Diacetylene,鈥漃roc. Nat. Acad. Sci, 105, 12713-12718, 2008.

Nolan White- M.S. in Chemistry; Electroanalytical and Negative Ion spectroscopy of Quinone Radical Anions

 

Aidan Usher - B.S. in Chemical Engineering, 2023; Negative Ion Spectroscopic Studies of Cyanoanthracene Radical Anion

 

Jonathan Dupuy - B.S. Chemistry; Vibrational Spectroscopy of Isoprene and Cyanobutadiene Anions

 

Garrett Isham - Secondary Education and B.S. Mechanical Engineering;  Identification, Learning and Teaching Threshold Concepts in Physical Chemistry

 

Wyatt Tunstall - B.S. Chemical Engineering; Negative Ion Spectroscopy of Napthoxy Anions

 

Lucia Vargas - B.S. Chemical Engineering; Mixed Organic Valence States in Quinone and Cyano PAH Anions

• CHEM 3510 鈥� Physical Chemistry I (Quantum Chemistry, Spectroscopy, and Intro. to Statistical Mechanics)
• CHEM 3520 鈥� Physical Chemistry II (Classical and Statistical Thermodynamics, Chemical Kinetics and Dynamics)
• CHEM 3520 and CHEM 3520 P-Chem Labs Instructor and Coordinator
• CHEM 6320 鈥� Advanced Physical Chemistry (Advanced Chemical Kinetics and Dynamics, Statistical Mechanics, and Modern Experimental Techniques in Physical Chemistry)
• CHEM 5970- Special Topics in Quantum Chemistry
• CHEM 4970 鈥� Special Topics: Introduction to Astrochemistry
• CHEM 3500- Elements of Physical Chemistry (A One Semester Overview of Physical Chemistry)
• CHEM 6970 鈥� Advanced Special Topics (Astrochemistry)
• EVSC 7990 鈥� Advanced Special Topics in Atmospheric Chemistry and Astrochemistry
• CHEM 1120- General Chemistry II

Research Opportunities:

The Gichuhi Research Group is currently accepting students for the 2023-24 academic year. Interested students should contact Dr. Gichuhi (wgichuhi@tntech.edu) for additional information.

Summer 2024 Undergraduate Research Grant