Tetramethylsilane (TMS) is a convenient standard (δ = 0 or τ = 10) in nuclear magnetic resonance spectroscopy. However, owing to its high vapor pressure, its specific gravity and low surface tension, pipetting of TMS is difficult. The alternative is the use of TMS in a micro-capillary as an external standard. This again brings about the necessity for correcting for the bulk susceptibility, which differs from solution to solution (<i>1</i>).
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