Publication detail

Multi-frequency rapid-scan HFEPR spectroscopy

LAGUTA, O. TUČEK, M. ŠEDIVÝ, M. SOJKA, A. SANTANA, V. VAN SLAGEREN, J. NEUGEBAUER, P.

Original Title

Multi-frequency rapid-scan HFEPR spectroscopy

Type

abstract

Language

English

Original Abstract

The development of the rapid scan technique was historically connected to the problem of the enhancement of the signal-to-noise ratio in NMR,1-2 but it did not find wide application in NMR or EPR due to the rapid development of high power radio-frequency and microwave sources for pulse methods. However, the past decade is marked by the intense development of solid-state THz instruments, which has made it possible to perform EPR spectroscopy at very high frequencies and fields.3-5 Unfortunately, the output power of such tunable THz sources is not sufficient for the implementation of pulse methods. Consequently, the rapid scan is the only affordable technique for multi-frequency investigation of spin dynamics at THz frequencies. To our best knowledge, this EPR technique was demonstrated at frequencies up to 94 GHz only.6 Here we present results of the first successful implementation of multi-frequency rapid-scan EPR in the (sub)millimeter frequency range with access to extremely short relaxation times (several nanoseconds). The experiments were performed using a home built HFEPR spectrometer (University of Stuttgart) operated in induction mode.4 The spectrometer does not require any resonator, and therefore, we are able to use frequency sweeps instead of magnetic field sweeps as it was done previously in the majority of experiments.7-9 The main advantages of the frequency domain are the extremely high sweep rates (thousands of THz/s) and absence of eddy currents in the sample holder and/or resonator.10 The new HFEPR spectrometer in the Central European Institute of Technology (Brno) will further extend the frequency range and sensitivity of the rapid scan technique.

Keywords

Spectroscopy; electron paramagnetic resonance;

Authors

LAGUTA, O.; TUČEK, M.; ŠEDIVÝ, M.; SOJKA, A.; SANTANA, V.; VAN SLAGEREN, J.; NEUGEBAUER, P.

Released

21. 7. 2019

Publisher

Society for Applied Spectroscopy

Location

Denver

Pages from

27

Pages to

27

Pages count

1

URL

https://rockychem.com/wp-content/uploads/2019/07/Abstracts-2019.pdf

BibTex

@misc{BUT157872,
  author="Oleksii {Laguta} and Marek {Tuček} and Matúš {Šedivý} and Antonín {Sojka} and Vinicius Tadeu {Santana} and Joris {van Slageren} and Petr {Neugebauer}",
  title="Multi-frequency rapid-scan HFEPR spectroscopy",
  year="2019",
  pages="27--27",
  publisher="Society for Applied Spectroscopy",
  address="Denver",
  url="https://rockychem.com/wp-content/uploads/2019/07/Abstracts-2019.pdf",
  note="abstract"
}