Stark experiments are reported on the S1←S0 0-0 transitions of chlorin (7,8-dihydroporphin) and its photoisomer in different sites in n-octane single crystals by photochemical hole-burning at 1.2K. Interpretation of chlorin’s results (Δμ = +0.25D) is straightforward; however, upon excitation the photoisomer’s dipole appears to rotate up to 24°.

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1982
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