| 摘要 |
A method of measuring a sample using nuclear magnetic resonance (NMR) spectroscopy uses a continuous broadband RF excitation spectrum having a first portion and a second higher frequency portion with a spectral gap between the portions (figure 1d). This is the inverse of the usual saturation NMR spectroscopy (figure 1a). If the frequency of the spectral gap matches the resonance frequency of a nuclear spin transition in the sample under test, this results in enhanced detectability (figure 1f). The spectral position of the spectral gap may be scanned by incrementing or decrementing its central frequency. The method may be used to measure a strained solid semiconductor sample such as a strained self-assembled quantum dots. An optical radiation source may be used to optically pump the sample, and optical radiation re-emitted from the sample may be measured using an optical detector.
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