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Fourier transform infrared spectroscopy (FTIR) was used to observe the photolysis and recombination of a new EPR‐silent CO‐inhibited form of α‐H195Q nitrogenase from Azotobacter vinelandii. Photolysis at 4 K reveals a strong negative IR difference band at $\tilde \nu $=1938 cm−1, along with a weaker negative feature at 1911 cm−1. These bands and the associated chemical species have both been assigned...
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