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Additional info for A textbook of inorganic chemistry vol.IX part II Iron and it's compounds
Moreover since the width of the region in the transmitter which gives a zero signal ("transmitter null width") is rather narrow, incomplete suppression 45 B) A) 8 6 4 0 PPM Fig. 130: The power of 1331 as a solvent suppression method illustrated by spectra of the pentapeptide Met-enkephalin in water. (A) Conventional spectrum. (B) Same spectrum scaled by a factor of 1000. Very little of the other peaks can be seen. (C) Spectrum obtained by selective excitation using the sequence 1331. (D) Expansion of the amide proton region of (C).
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A textbook of inorganic chemistry vol.IX part II Iron and it's compounds