Novel loop-gap probe head for time-resolved electron paramagnetic resonance at 9.5 GHz
作者:
G. Elger,
J. T. To¨rring,
K. Mo¨bius,
期刊:
Review of Scientific Instruments
(AIP Available online 1998)
卷期:
Volume 69,
issue 10
页码: 3637-3641
ISSN:0034-6748
年代: 1998
DOI:10.1063/1.1149151
出版商: AIP
数据来源: AIP
摘要:
A novel probe head with a two-loop-one-gap resonator forX-band (9.5 GHz) time-resolved transient electron paramagnetic resonance measurements with direct detection is described. The low quality factorQof the resonator allows time resolution in the order of 10 ns while the high filling factor guarantees a sensitivity which is at least comparable to that of conventional cavity resonators. A novel feature of the resonator is the coupling mechanism which exploits the field distribution in the microwave shield. The type of the resonator and the microwave coupling scheme chosen provide high mechanical stability of the setup. This is particularly important for pulsed laser excitation and gas stream cooling of the sample. The advantages of the probe head are demonstrated by relaxation measurements on the photoexcited triplet state of zinc-tetratolylporphyrin, for which the high time resolution allows the determination of fast anisotropic relaxation. This relaxation behavior can be attributed to the dynamic Jahn–Teller effect. ©1998 American Institute of Physics.
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