期刊
JOURNAL OF CHEMICAL PHYSICS
卷 126, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.2404678
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资金
- NCRR NIH HHS [RR021907] Funding Source: Medline
- NIBIB NIH HHS [EB003832] Funding Source: Medline
Porphyrin molecules have a highly conjugated cyclic structure and are theorized to have unusually large two-photon absorptivities (sigma(TPA)), i.e., sigma(TPA)similar to 10(2) GM. The authors tested this claim. Ultrafast two-photon absorption (TPA) spectroscopy was performed on solutions of hemoglobin, which contains a naturally occurring metaloporphyrin. They used a pump-probe technique to directly detect the change in transmission induced by TPA over the wavelength range of lambda(0)=780-880 nm. As controls, they measured the TPA of the dyes rhodamine 6G and B; their measurements both verify and extend previously reported values. In new results, hemoglobin was found to have a peak two-photon absorptivity of sigma(TPA)similar to 150 GM at lambda(0)=825 nm, near a resonance of the Soret band. This value supports theoretical expectations. They also found a significant difference in the TPA of carboxyhemoglobin versus oxyhemoglobin, e.g., sigma(TPA)=61 GM versus sigma(TPA)=18 GM, respectively, at lambda(0)=850 nm, which shows that the ligand affects the electronic states involved in TPA. (c) 2007 American Institute of Physics.
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