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Two-photon-induced anisotropic transient absorption in bacteriorhodopsin

✍ Scribed by Chaozhi Wan; Qin Song; Carey K. Johnson

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
649 KB
Volume
210
Category
Article
ISSN
0009-2614

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✦ Synopsis

Two-photon excitation (TPE) of the photocycle of bacteriorhodopsin (BR) with 1064 nm pulses was observed, and the subsequent transient absorption and linear dichroism changes measured at 568 nm. An anisotropy of0.55 was induced in the groundstate transition of BR. A theoretical formalism is described to treat the isotropic and anisotropic component of the two-photon absorptivity measured by a secondary transition dipole that is induced by TPE and probed by polarized fluorescence or transientabsorption methods. The two-photon tensor for BR is found to contain components that are not paralle1 to the one-photon transition dipole.

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