Recent Research (Jun Yoshinobu)

Last update on June 17, 1996

Observation of atoms and molecules on solid surfaces by a local probe method

Atoms and molecules on solid surface (100-300 K) are observed by means of scanning tunneling microscopy (STM). Current research interests are focused on:
(1) Reconstruction and its dynamical processes on solid surfaces induced by adsorption and reaction of atoms and molecules.
(2) Microscopic states of adsorbed molecules
(3) Identification / discrimination of adsorbed molecules such as DNA base molecules
(4) Dynamical processes of surface migration and superstructure formation of adsorbed molecules


Selected publications:
1. "Elucidation of hydrogen-induced (1x2) reconstructed structures on Pd(110) from 100 K to 300 K by STM", J. Yoshinobu, Tanaka and M. Kawai, Phys. Rev. B 51 (1995) 4529-4532.
2."Oxygen-induced reconstruction of the Pd(110) surface: an STM study", H. Tanaka, J. Yoshinobu and M. Kawai, Surf. Sci., 235 (1995) L505- L509.
3. "Imaging of the Nucleic Acid Base Molecules on Pd(110) Surface by Scannning Tunneling Microscopy",H. Tanaka, J. Yoshinobu, M. Kawai and T. Kawai, Jpn. J. Appl. Phys., 35 (1996) L244-L246.
4. "Adsorption, migration and superstructure-formation of benzene on Pd(110)", J. Yoshinobu, H. Tanaka, T. Kawai and M. Kawai, Phys. Rev. B., 53 7492-7495 (1996).

Microscopic understanding of surface chemical reactions by vibrational spectroscopy

Infrared reflection absorption spectroscopy (IRAS), low-energy electron diffraction (LEED), thermal desorption spectroscopy (TDS) etc. are applied to study adsorbed molecules on well-defined solid surfaces. Our research interests are focused on:
(1) Experimental study on potential energy surface of adsorption, migration, and desorption.
(2) Metastable/non-equilibrium adsorbed states at low temperature.
(3) Laser induced surface photochemistry.
(4) Co-adsorption system as a model for solid/liquid interface

Selected publications:
1. "Symmetry controlled surface photochemistry of methane on Pt(111)", J. Yoshinobu, H. Ogasawara and M. Kawai, Phys. Rev. Lett., 75 (1995) 2176-2179.
2. "Thermal excitation of oxygen species as a trigger for the CO oxidation on Pt(111)", J. Yoshinobu and M. Kawai, J. Chem. Phys. 103 (1995) 3220-3229.
3. "Stability of adsorbed states and site-conversion kinetics: CO on Ni(100)", J. Yoshinobu, N. Takagi and M. Kawai, Phys. Rev. B 49 (1994) 16670-16677.
4. "Temporal and local reduction of a potential energy well under dynamic equilibrium: CO on Ni(100)", N. Takagi, J. Yoshinobu and M. Kawai, Phys. Rev. Lett. 73 (1994) 292-295.

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