Multi-frequency rapid-scan HFEPR

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F18%3APU129901" target="_blank" >RIV/00216305:26620/18:PU129901 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jmr.2018.09.005" target="_blank" >http://dx.doi.org/10.1016/j.jmr.2018.09.005</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jmr.2018.09.005" target="_blank" >10.1016/j.jmr.2018.09.005</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Multi-frequency rapid-scan HFEPR

Popis výsledku v původním jazyce

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 ¼ ð2p sweep rateÞ0:5 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.

Název v anglickém jazyce

Multi-frequency rapid-scan HFEPR

Popis výsledku anglicky

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 ¼ ð2p sweep rateÞ0:5 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Projekt

<a href="/cs/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF MAGNETIC RESONANCE

ISSN

1090-7807

e-ISSN

1096-0856

Svazek periodika

296

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

138-142

Kód UT WoS článku

000452581500017

EID výsledku v databázi Scopus

2-s2.0-85053841073