Establishment of two-dimensional spectroscopy in the visible region and control of photosynthetic excitation energy flow

2014 Fiscal Year Final Research Report

• Project/Area Number: 22340085
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Osaka City University
• Principal Investigator: SUGISAKI Mitsuru 大阪市立大学, 大学院理学研究科, 准教授 (20360042)
• Co-Investigator(Kenkyū-buntansha): FUJII Ritsuko 大阪市立大学, 複合先端研究機構, 准教授 (80351740) ; HASHIMOTO Hideki 大阪市立大学, 複合先端研究機構, 教授 (50222211)
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: 超高速分光 / コヒーレンス / 光合成 / 色素蛋白超分子複合体 / エネルギー移動

Outline of Final Research Achievements

The electronic and nuclear dynamics of photosynthetic membranes, pigment-protein complexes and isolated pigments from photosynthetic purple bacteria have been investigated by means of nonlinear spectroscopy. The former experimental setup for the coherent spectroscopic measurements has been rearranged into the double-pulse configuration to extract the information in the spectral domain. By changing the temporal separations of excitation pulses, artificial enhancement of coupled modes that are intrinsically forbidden in photosynthetic pigments and significant suppression of allowed fundamental modes have been attained in the four-wave mixing configuration. In the pump-probe configuration, an electronic decoherent process within 100 femtoseconds has been observed.

Free Research Field

光物性物理学