Ph. D. in Surface Science (Mar. 1994 ~ Aug.1998, Pohang University of Science and Technology, POSTECH)
M.Sc. in Physical Chemistry (Mar. 1992 ~ Feb. 1994, POSTECH)
B. Ss. in Chemistry (Mar. 1988 ~ Feb. 1992, POSTECH)

1998.09 – 1999.04
Postdoctoral Researcher, Department of Chemistry, Pohang University of Science and Technology

1999.05 – 2000.08
Postdoctoral Researcher, Physics Department, Cornell University

2000.08 – 2000.10
Postdoctoral Researcher, Department of Physics and Astronomy, University of California, Irvine

2001.04 – 2002.09
BK21 Assistant Professor & Postdoctoral Researcher, School of Chemistry, Seoul National University

2002.10 – 2006.09
Assistant Professor, Department of Chemistry, Chonbuk National University

2006.10 –2011.09
Associate Professor, Department of Chemistry, Chonbuk National University

2008.07 – 2010.02
Visiting Professor, Department of Physics, North Carolina State University

2011.10 - present
Professor, Department of Chemistry, Chonbuk National University

Young Vacuum Scientist Award (Korean Vacuum Society, 1999)
Winter Institute Fellowship at RIKEN (Japan) (1997).
Young Research Student Fellowship (National Research Foundation in Korea, 1995).

Single-molecule science (spectroscopy, manipulation, and microscopy) with a variable-low temperature scanning tunneling microscope (STM)
Silicon surface science: reaction of organic molecules with Si surfaces
Oxidation and defect chemistry of graphite and graphene
Self-assembled monolayers and nanostructures on metal and graphite surfaces
Home-made instrumentation of various STM systems including mechanical head, control electronics, and software
Surface analysis with Cs+-reactive ion scattering spectrometry and X-ray photoelectron spectroscopy (XPS)
Measurement of physic-chemical properties of nanostructures with atomic force microscope (AFM)
Thermal desorption spectrometry (TDS) and Auger electron spectroscopy (AES)
Fabrication of ZnO nanostructures

1. S. H. Jang, S. Jeong, J. R. Hahn, "Adsorption structures of 2,3-butanediol on Si(001)", Submitted to J. Phys. Chem. C (2007).

2. H. Jeong, S. Jeong, S. H. Jang, J. M. Seo, J. R. Hahn, "Atomic structures of benzene and pyridine on Si(5 5 12)", J. Phys. Chem. B (2006).

3. J. R. Hahn, W. Ho, "Imaging and vibrational spectroscopy of sinlge pyridine molecules on Ag(110) using a low-temperature scanning tunneling microscope", J. Chem. Phys. 124, 204708(2006).

4. J. R. Hahn, Hojin Jeong, Sukmin Jeong, "Adsorption structures of benzene on a Si(5 5 12)-2x1 surface: A combined STM and theoretical study", J. Chem. Phys.123 (21) (2005).

5. J. R. Hahn, W. Ho, "Chemisorption and Dissociation of Single Oxygen Molecules on Ag(110)", J. Chem. Phys. 123(20) (2005).

6. J. R. Hahn, W. Ho, "Direct observation of C2 hydrocarbon-oxygen complexes on Ag(110) with a variable-low temperature scanning tunneling microscope", J. Phys. Chem. B, 45 (2005).

7. J. R. Hahn, W. Ho, "Orbital specific chemistry: Controlling the pathway in single-molecule dissociation", J. Chem. Phys. 122, 244704 (2005). (This paper was selected for the July 1, 2005 issue of Virtual Journal of Biological Physics Research (www.vjbio.org)

1.Fabrication of solid cylindrical shaped microtowers of ZnO/C core-shell hexagonal nanorods by thermolysis, J. Phys. Chem. C 116, 23153 (2012). M. M. Hossain, A. H. A. Mamun, J. R. Hahn

2.Binding structures of propylene glycol stereoisomers on the Si(001)-2x1 surface: A combined scanning tunneling microscopy and theoretical study, J. Chem. Phys. 134, 044704 (2011). J. R. Hahn, S. C. Bharath, S. Jeong, T. P. Pearl

3.Pairing of (R,R)-2,3-butanediol molecules on a Si(001) surface, J. Phys. Chem. C 114, 17761 (2010). J. R. Hahn, S. H. Jang, S. Jeong

4.Spatially inhomogeneous inelastic electron tunneling in oxygen-ethylene complexes on Ag(110) resolved with a scanning tunneling microscope, Phys. Rev. B 80, 165428 (2009). J. R. Hahn, W. Ho

5.Vibrational mode specific bond dissociation in a single molecule, J. Chem. Phys. 131, 044706 (2009). J. R. Hahn, W. Ho

6.Electric field effect on the vibration of single CO molecules in a scanning tunneling microscope junction. J. Phys. Chem. B 112, 4731 (2008). S. Yan, J. Y. Lee, J. R. Hahn

7.Adsorption structures of 2,3-butanediol on Si(001), J. Phys. Chem. C 111, 340 (2007). S. H. Jang, S. Jeong, J. R. Hahn

8.Atomic structures of benzene and pyridine on Si(5 5 12), J. Phys. Chem. B 110, 15912 (2006). H. Jeong, S. Jeong, S. H. Jang, J. M. Seo, J. R. Hahn

9.Imaging and vibrational spectroscopy of single pyridine molecules on Ag(110) using a low-temperature scanning tunneling microscope, J. Chem. Phys. 124, 204708 (2006). J. R. Hahn, W. Ho

10.Adsorption structures of benzene on a Si(5 5 12)-2x1 surface: A combined STM and theoretical study, J. Chem. Phys. 123, 244702 (2005). J. R. Hahn, H. Jeong, S. Jeong

11.Orbital specific chemistry: Controlling the pathway in single-molecule dissociation, J. Chem. Phys. 122, 244704 (2005). J. R. Hahn, W. Ho

12.Kinetic study of graphite oxidation along two lattice directions, Carbon 43, 1506 (2005). J. R. Hahn

13.Local and non-local functions of Cs promoter in the O2-oxidation of graphite, J. Phys. Chem. B 106, 7445 (2002). J. R. Hahn, H. Kang

14.Single molecule imaging and vibrational spectroscopy with a chemically modified tip of a scanning tunneling microscope, Phys. Rev. Lett. 87, 196102 (2001). J. R. Hahn, W. Ho

15.Oxidation of a single carbon monoxide molecule manipulated and induced with a scanning tunneling microscope, Phys. Rev. Lett. 87, 166102 (2001). J. R. Hahn, W. Ho

16.Electronic resonance and symmetry in single-molecule inelastic electron tunneling, Phys. Rev. Lett. 85, 1914 (2000). J. R. Hahn, H. J. Lee, W. Ho

17.Defect-induced oxidation of graphite, Phys. Rev. Lett. 82, 217 (1999). S. M. Lee, Y. H. Lee, Y. H. Hwang, J. R. Hahn, H. Kang

18.Promoted graphite oxidation in the presence of Cs trapped between basal planes, Surface Sci. 423, L216 (1999). J. R. Hahn

19.Vacancy and interstitial defects at graphite surfaces. scanning tunneling microscopic study of the structure, electronic property, and yield for ion-induced defect creation, Phys. Rev. B 60, 6007 (1999). J. R. Hahn, H. Kang

20.Observation of charge enhancement induced by graphite atomic vacancy. A comparative STM and AFM study, Phys. Rev. B 53, R1725 (1996). J. R. Hahn, H. Kang, S. Song, I. C. Jeon

“Vibration of single water molecules: STM and STM-IETS Study”, Workshop on Dynamics and Structure of Water, Taiwan (2011).
“Control and monitoring surface chemical reactions with a scanning tunneling microscope”, International Symposium on Controlled Surface Reactions, Korea (2011).
“Seeing and touching single molecules at a time”, The Winter School of Asian CORE, Japan (2011).
"Visualization and vibrational spectroscopy of single molecules on silver surface using an STM”, KCS conference, Korea (2008).
"Surface dynamics at the spatial limit", The 9th East Asian Workshop on Chemical Reactions, KAIST, Korea (2005).
"Spectroscopy, microscopy, and chemistry with a scanning tunneling microscope", ASSRC Korea-Japan Workshop, Seoul, Korea (2003).
"Surface dynamics at the single molecule level", American Physical Society, Seattle, USA (2001).
"Spatially resolved probing of the chemical bond by STM inelastic electron tunneling", The 3rd Asian STM Conference, Japan (2000).