X‐band (ca. 9 GHz) fluid solution rapid‐scan electron paramagnetic resonance spectra are reported for radicals with multiline spectra and resolution of hyperfine lines as narrow as 30 mG. Highly‐resolved spectra of 3‐carbamoyl‐2,2,5,5‐tetramethylpyrrolidin‐1‐yloxy, diphenylnitroxide, galvinoxyl, and perylene cation radical with excellent signal‐to‐noise are shown, demonstrating the capabilities of the rapid‐scan technique to characterize very small, well‐resolved hyperfine couplings. To acquire high resolution spectra the signal bandwidth must be less than the resonator bandwidth. Signal bandwidth is inversely proportional to linewidth and proportional to scan rate. Resonator bandwidth is inversely proportional to resonator Q. Proper selection of scan rate and resonator Q is needed to achieve resolution of closely‐spaced narrow EPR lines.

中文翻译：

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有机自由基中高分辨超精细物质的快速扫描电子顺磁共振。

X波段（约9 GHz）流体溶液的快速扫描电子顺磁共振光谱据报道具有多线光谱的自由基，其超细线的分辨率窄至30 mG。显示了3-氨基甲酰基-2-3,2,5,5-四甲基吡咯烷-1-氧基，二苯基硝基氧，加尔维氧基和per阳离子的高分辨光谱，具有出色的信噪比，证明了快速扫描技术的功能来表征非常小且分辨率良好的超精细耦合。为了获得高分辨率频谱，信号带宽必须小于谐振器带宽。信号带宽与线宽成反比，与扫描速率成正比。谐振器带宽与谐振器Q成反比。需要正确选择扫描速率和谐振器Q才能实现间距狭窄的窄EPR线的分辨率。