High-frequency tunable EPR spectroscopy of Tm3+ ions in synthetic forsterite

The measurement of EPR spectra during pulsed EPR experiments is commonly accomplished by recording the integral of the electron spin echo as the applied magnetic field is stepped through the spectrum. This approach to echo-detected EPR spectral measurement (ED-EPR) limits sensitivity and spectral resolution and can cause gross distortions in the resulting spectra because some of the information present in the electron spin echo is discarded in such measurements. However, Fourier Transformation of echo shapes measured at a series of magnetic field values followed by skew projection onto either a magnetic field or resonance frequency axis can increase both spectral resolution and sensitivity without the need to trade one against the other. Examples of skew-projected spectra with single crystals, glasses and powders show resolution improvements as large as a factor of seven with sensitivity increases of as much as a factor of five.

show abstract

“…However, most EPR measurements take only a 1D slice through that surface, for an exception, see [5–7]. Although eqns.…”

Section: Introductionmentioning

confidence: 99%

Skew projection of echo-detected EPR spectra for increased sensitivity and resolution

Bowman

Krzyaniak

Cruce

et al. 2013

Journal of Magnetic Resonance

View full text Add to dashboard Cite

show abstract

“…Other reports of CW spectra in various crystal environments include for Tb 3+ [16,17,45,50,51] and for Tm 3+ [1,2,8,10,16,40,44,[52][53][54][55][56][57].…”

Section: Comparison With Prior Workmentioning

confidence: 99%

Electron Spin Relaxation of Tb3+ and Tm3+ Ions

et al. 2020

View full text Add to dashboard Cite

Electron spin relaxation times T 1 and T m of Tb 3+ and Tm 3+ in 1:1 water:ethanol and of Tb 3+ doped (2%) in crystalline La 2 (oxalate) 3 decahydrate were measured between about 4.2 and 10 K. Both cations are non-Kramers ions and have J = 6 ground states. Echo-detected spectra are compared with CW spectra and with field-stepped direct-detected EPR spectra. Due to the strong temperature dependence of T 1 , measurements were not made above 10 K. Between about 4.2 and 6 K T 1 is strongly concentration dependent between 1 and ~50 mM. T 1 values at 4.2 K are in the μs range which is orders of magnitude faster than for 3d transition metals. Phase memory times, T m , are less than 500 ns, which is short relative to values observed for 3d transition metals and organic radicals at 4 K. T m is longer in the oxalate lattice which is attributed to the lower proton concentration in oxalate than in the organic solvent, which decreases nuclear spin diffusion. The rigidity of the crystalline lattice also may contribute to longer T m .

show abstract

“…Известно, что в монокристаллах форстерита (Mg 2 SiO 4 ) примесные редкоземельные ионы (Ln) замещают двухвалентные ионы магния [1][2][3][4][5][6]. При таком гетеровалентном замещении необходим специальный компенсатор избыточного катионного заряда, в роли которого выступают точечные дефекты с эффективным зарядом противоположного знака.…”

Section: Introductionunclassified

Димерная Самоорганизация Примесных Ионов Эрбия В Синтетическом Форстерите

Зарипов¹,

Мингалиева²,

Тарасов³

et al. 2019

Физика Твердого Тела

View full text Add to dashboard Cite

The electron paramagnetic resonance spectra of impurity trivalent erbium ions in synthetic forsterite single crystals (Mg_2SiO_4) have been studied by the electron paramagnetic resonance method in the X and Q frequency bands. It is found that erbium ions predominantly substitute for magnesium ions in crystallographic position M1 that is characterized by the inversion symmetry of the crystal field. In this case, a pronounced effect of dimer self-organization of erbium ions during the crystal growth takes place; the effect is manifested in the fact that the concentration of erbium dimer associates consisting of two closely spaced ions bound by the spin– spin interaction is several orders of magnitude higher than the concentration of dimer associates that form randomly at a statistical distribution of impurity ions in the forsterite crystal lattice. The directions of the main magnetic axes and the parameters of the effective spin Hamiltonian describing the magnetic characteristics of impurity erbium centers have been determined.

show abstract

High-frequency tunable EPR spectroscopy of Tm3+ ions in synthetic forsterite

Cited by 12 publications

References 29 publications

Skew projection of echo-detected EPR spectra for increased sensitivity and resolution

Skew projection of echo-detected EPR spectra for increased sensitivity and resolution

Electron Spin Relaxation of Tb3+ and Tm3+ Ions

Димерная Самоорганизация Примесных Ионов Эрбия В Синтетическом Форстерите

Contact Info

Product

Resources

About