Direct EPR detection of transient and continuous wave signals at 2.5 GHz |
| |
Authors: | Forrer Jörg Schmutz Hansjürg Tschaggelar Rene Schweiger Arthur |
| |
Institution: | Physical Chemistry, ETH Zurich, CH-8093 Zurich, Switzerland. |
| |
Abstract: | Direct detection of free induction decays and electron spin echoes, and the recording of echo-detected EPR spectra and electron spin echo envelope modulation patterns at a microwave frequency of 2.5 GHz is demonstrated. This corresponds to the measurement of the transverse magnetization in the laboratory frame, rather than in the rotating frame as usually done by down-converting the signal (homodyne detection). An oscilloscope with a 6-GHz analog bandwidth, a sampling rate of 20 GigaSamples per second, and a trigger frequency of 5 GHz for the edge trigger and 750 MHz for the advanced trigger, is used in these experiments. For signal averaging a 3-GHz microwave clock divider has been developed to synchronize the oscilloscope with the frequency of the EPR signal. Moreover, direct detection of continuous wave EPR signals at 2.5 GHz is described. |
| |
Keywords: | Pulse EPR Continuous wave EPR Direct digital detection |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|