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The methylcobalamin cofactor (MeCbl), which is one of the biologically active forms of vitamin B12, has been the subject of many spectroscopic and theoretical investigations. Traditionally, the lowest‐energy part of the photoabsorption spectrum of MeCbl (the so‐called α/β band) has been interpreted as an S0→S1 electronic transition dominated by π→π* excitations associated with the CC stretching of...
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