INTERFACE SPECTROSCOPY GROUP
Developments of novel interface-selective nonlinear spectroscopies and elucidations of molecular mechanisms of interfacial phenomena
The static and dynamic properties of molecules at interfaces have attracted much attention in a wide range of scientific fields. It is known that interfaces have unique properties that differ substantially from those in bulk materials. However, microscopic mechanisms of such interfacial phenomena are hardly understood even today. Even very simple questions, such as how are the structure and orientation of water molecules at the air/water interface, have not been answered until 10 years ago. Even-order nonlinear spectroscopic methods are the most powerful techniques for the investigation of molecular properties at interfaces. These methods are based on an even-order nonlinear susceptibility χ(2n) (n=1,2,…), which allows us to probe molecules specifically at interfaces where inversion symmetry is necessarily broken. In our group, by developing new techniques based on the even-order nonlinear optics, we investigate the structures and dynamics of molecules at interfaces. These novel techniques allow us to find various kinds of new physical insights associated with interfacial science, opening up a new way to study interfacial science. Recently, we are focusing on three major themes: (1) Ultrafast hydrogen bond dynamics of water at aqueous interfaces. (2) Photochemical reaction dynamics at interfaces. and (3) Structure-function relation at complex interfaces.
Prashant (OB), Ahmed (OB), Subhadip, Woongmo, Nihonyanagi, Kinoshita; 2023/3/22.
Satoshi Nihonyanagi (group leader)
- F. WEI, S. URASHIMA, S. NIHONYANAGI and T. TAHARA
Elucidation of pH-Dependent Electric Double Layer Structure at the Silica/Water Interface Using Heterodyne-Detected Vibrational Sum Frequency Generation Spectroscopy
J. Am. Chem. Soc. 145, 8833-8846 (2023).
- R. KUSAKA, S. NIHONYANAGI, and T. TAHARA
The photochemical reaction of phenol becomes ultrafast at the air–water interface
Nat. Chem. 13, 306 (2021). Front Cover
- K. INOUE, M. AHMED, S. NIHONYANAGI, and T. TAHARA
Reorientation-induced relaxation of free OH at the air/water interface revealed by ultrafast heterodyne-detected nonlinear spectroscopy
Nature. Communs. 11, 5344 (2020).
- M. AHMED, K. INOUE, S. NIHONYANAGI, and T. TAHARA
Hidden Isolated OH at the Charged Hydrophobic Interface Revealed by Two-Dimensional Heterodyne-Detected VSFG Spectroscopy
Angew. Chem. Int. Ed. 59, 9498 (2020). Hot paper, Inside Back Cover
- A. SAYAMA, S. NIHONYANAGI, Y. OHSHIMA, and T. TAHARA
In situ observation of the potential-dependent structure of an electrolyte/electrode interface by heterodyne-detected vibrational sum frequency generation
Phys. Chem. Chem. Phys., 22, 2580 (2020)
- A. MYALITSIN, S. GHOSH, S. URASHIMA, S. NIHONAYANAGI, S. YAMAGUCHI, T. AOKI, and T. TAHARA
Structure of water and polymer at the buried polymer/water interface unveiled using heterodyne-detected vibrational sum frequency generation
Phys. Chem. Chem. Phys., 22, 16527 (2020)
- S. NIHONYANAGI, S. YAMAGUCHI and T. TAHARA
Direct evidence for orientational flip-flop of water molecules at charged interfaces: a heterodyne-detected vibrational sum frequency generation study
J. Chem. Phys. 130, 20, 204704 (2009).