Abstract
The most common technique used in pulse electron paramagnetic resonance spectroscopy to determine interspin distances in the nanometer range is pulse electron double resonance, while relaxation-induced dipolar modulation enhancement (RIDME) is a promising alternative to this method. In this article we introduced a selective hole-burning technique for RIDME experiment, which allows dead-time free measurement of dipolar modulation without the use of the second microwave frequency or a magnetic field jump. This technique was tested on a short, stable biradical in a frozen solution, and the optimal experimental conditions for the measurement of dipolar modulation were found. Interspin distances in the range of 13 A ≤ r ≤ 25 A can be measured by the proposed method.
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