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The n - p* and p - p* transitions excite AB to S1 and S2 states, respectively. The AB cis 2 trans interconversion can be controlled by irradiating at either transistion or by changing the intensity of a monochromatic source. t-AB undergoes trans - cis isomerization following both S1¡ûS0 and S2¡ûS0 excitation¡£Similarly, c-AB can be converted to t-AB by exciting into the S1 or S2 state.The sum of the quantum yields does not equal unity, which indicates multiple pathways for isomerization. In stilbene here isomerization occurs exclusively by rotation, the quantum yield for all photoinduced processes equals 1 in both cis-trans and trans-cis.
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