High Magnetic Fields and High Frequencies

High Magnetic Fields and High Frequencies
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高磁场和高频率

DOI:
10.1007/978-1-4612-1486-1_11
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发表时间:
1999
影响因子:
3.4
通讯作者:
G. Eaton
G. Eaton
中科院分区:
生物学3区
文献类型:
--
作者:
S. Eaton;G. Eaton

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需要对“高场”ESR的含义发表一些评论。在口语化用法中,科学家通常指高频,即高场,并指ESR频率高于通常使用的或商业上可用的频率。在这个意义上,高场ESR意味着使用35 GHz以上的频率(大多数ESR光谱仪称之为Q波段)。现在,布鲁克仪器公司已经推出了95 GHz光谱仪,而共振技术公司提供了95 GHz、150 GHz和250 GHz的频率,这种常见的定义将频率的下限移到了更高的频率。然而,在这些商业上可用的频率变得普遍使用之前,大多数光谱学家将继续认为它们是“高”频率。我们的假设是,当g=2时,我们也参考磁场,因此高频意味着强磁场。在这篇综述中,90 GHz以上的频率被定义为“高”。要在这些频率下实现g=2的共振,需要大于3.2T的磁场。
Some comment is needed about what could be meant by" high-field" ESR. In colloquial use scientists usually mean high-frequency when the say high-field, and refer to ESR frequency greater than that commonly used or commercially available. In this sense, high-field ESR has meant the use of frequencies above 35 GHz (called Q-bandª by most ESR spectroscopists). Now that 95 GHz spectrometers are commercially available from Bruker Instruments, and frequencies of 95, 150, and 250 GHz are offered by Resonance Technologies, this common definition moves the lower bound to higher frequencies. Nevertheless, until these commercially available frequencies become commonly used, most spectroscopists will continue to consider them" high" frequencies. The assumption is that we also refer to the magnetic field for g= 2, so high frequency implies high magnetic field. In this review frequencies above 90 GHz are defined as" high." To achieve resonance at g= 2 at these frequencies requires magnetic fields greater than 3.2 T.
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