Gaining access to electron spin dynamics at (sub-)THz frequencies is highly challenging. However, this information is highly relevant for the understanding and development of spin polarization agents in dynamic nuclear polarization methods and single-molecule magnets for quantum computation. Here we demonstrate the first rapid-scan EPR experiment in 200 GHz frequency region. A voltage controlled oscillator (VCO) generated fast sinusoidal frequency sweeps with scan rates up to 3×105 THz/s after the frequency multiplication, which is equal to 107 T/s in field representation. Such high scan rates provide access to extremely short relaxation times T2=2π×sweeprate-0.5≈1 ns. The absence of a microwave cavity allowed us to perform multi-frequency experiments in the 170-250 GHz range. A further advantage of a cavity-less approach is the possibility to use vast sweeps, which in turn, allows the deconvolution using a linear sweep function. The deconvoluted spectra obtained with this method are identical to the slow-rate spectrum. We find spin-spin relaxation times of several nanoseconds for pure LiPc samples in this frequency range. These values cannot be obtained by means of conventional pulsed EPR methods.
%0 Journal Article
%1 Laguta.2018
%A Laguta, O.
%A Tuček, M.
%A van Slageren, J.
%A Neugebauer, P.
%D 2018
%J Journal of magnetic resonance (San Diego, Calif. : 1997)
%K agvsl imported
%P 138--142
%R 10.1016/j.jmr.2018.09.005
%T Multi-frequency rapid-scan HFEPR
%V 296
%X Gaining access to electron spin dynamics at (sub-)THz frequencies is highly challenging. However, this information is highly relevant for the understanding and development of spin polarization agents in dynamic nuclear polarization methods and single-molecule magnets for quantum computation. Here we demonstrate the first rapid-scan EPR experiment in 200 GHz frequency region. A voltage controlled oscillator (VCO) generated fast sinusoidal frequency sweeps with scan rates up to 3×105 THz/s after the frequency multiplication, which is equal to 107 T/s in field representation. Such high scan rates provide access to extremely short relaxation times T2=2π×sweeprate-0.5≈1 ns. The absence of a microwave cavity allowed us to perform multi-frequency experiments in the 170-250 GHz range. A further advantage of a cavity-less approach is the possibility to use vast sweeps, which in turn, allows the deconvolution using a linear sweep function. The deconvoluted spectra obtained with this method are identical to the slow-rate spectrum. We find spin-spin relaxation times of several nanoseconds for pure LiPc samples in this frequency range. These values cannot be obtained by means of conventional pulsed EPR methods.
@article{Laguta.2018,
abstract = {Gaining access to electron spin dynamics at (sub-)THz frequencies is highly challenging. However, this information is highly relevant for the understanding and development of spin polarization agents in dynamic nuclear polarization methods and single-molecule magnets for quantum computation. Here we demonstrate the first rapid-scan EPR experiment in 200 GHz frequency region. A voltage controlled oscillator (VCO) generated fast sinusoidal frequency sweeps with scan rates up to 3×105 THz/s after the frequency multiplication, which is equal to 107 T/s in field representation. Such high scan rates provide access to extremely short relaxation times T2=2π×sweeprate-0.5≈1 ns. The absence of a microwave cavity allowed us to perform multi-frequency experiments in the 170-250 GHz range. A further advantage of a cavity-less approach is the possibility to use vast sweeps, which in turn, allows the deconvolution using a linear sweep function. The deconvoluted spectra obtained with this method are identical to the slow-rate spectrum. We find spin-spin relaxation times of several nanoseconds for pure LiPc samples in this frequency range. These values cannot be obtained by means of conventional pulsed EPR methods.},
added-at = {2018-10-26T17:40:08.000+0200},
author = {Laguta, O. and Tuček, M. and {van Slageren}, J. and Neugebauer, P.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2ef122ac3b6871d405581a6e0fe6211da/mariowinkler},
doi = {10.1016/j.jmr.2018.09.005},
interhash = {943b6efbe93ad16f648a9aed316c88d1},
intrahash = {ef122ac3b6871d405581a6e0fe6211da},
journal = {Journal of magnetic resonance (San Diego, Calif. : 1997)},
keywords = {agvsl imported},
pages = {138--142},
timestamp = {2018-10-26T15:50:00.000+0200},
title = {Multi-frequency rapid-scan HFEPR},
volume = 296,
year = 2018
}