Title: Ultrafast Spectroscopy of Oxyhemoglobin during Photodissociation
Authors: Yabushita, Atsushi
Kobayashi, Takayoshi
電子物理學系
Department of Electrophysics
Issue Date: 9-Sep-2010
Abstract: Ultrafast time-resolved pump probe spectroscopy was studied to clarify the detailed mechanism in the photodissociation process of oxyhemoglobin in the visible spectral range. The photodissociation had not been time-resolved and only the upper limit of the time needed for the dissociation process was claimed to be faster than 50 fs; it was time-resolved to be 45 +/- 5 fs with 10 fs time resolution. The broadband spectrum of the visible laser pulses enabled us to observe the signal over a broad spectral range. A broadband multichannel detector array was used to simultaneously obtain the pump probe signal at all probe frequencies. Thus, we obtained for the first time the spectra of the ultrashort lifetime electronic excited state of HbO(2) in the visible range from 523 urn (19 109 cm(-1)) to 719 nm (13 914 cm(-1)). After the photodissociation, subpicosecond time constant was found and attributed to the dynamics of the photolyzed Hb. Time-resolved difference absorption spectra in 0-100 fs showed oscillatory motion reflecting wavepacket motion in the potential energy surface of the photoexcited HbO(2) during the ultrafast photolysis.
URI: http://dx.doi.org/10.1021/jp103593q
http://hdl.handle.net/11536/32200
ISSN: 1520-6106
DOI: 10.1021/jp103593q
Journal: JOURNAL OF PHYSICAL CHEMISTRY B
Volume: 114
Issue: 35
Begin Page: 11654
End Page: 11658
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