Crystal rotation and orientation for electron spin resonance studies

Hutton, D. R.; Seed, T.J.

doi:10.1088/0950-7671/43/12/423

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…Initial data were collected from a 4 mm a side cube of sample, mounted on a horizontal axis rotator (Hutton and Seed 1966) installed in a purpose built single crystal spectrometer. Precision data were collected from a Varian E12 X band spectrometer, using a 1 mm a side crystal mounted on a two-axis goniometer (Morton et al 1981).…”

Section: Methodsmentioning

confidence: 99%

Electron Spin Resonance of V4+(VO2+) in Beryl

Hutton¹,

Darmann²,

Troup³

1991

Aust. J. Phys.

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Synthetic Australian Biron beryl coloured green by vanadium was irradiated with a dose of 10 kGy of 137Cs y rays. The reSUlting ESR spectrum has been modelled as being due to 12 equivalent V02+ centres, each arising from a complex formed from the substitution of V 3 + in the beryl aluminium octahedral site, together with electron loss and motion towards a nearest neighbour oxygen. Each centre can be fitted to an axial spin Hamiltonian H=f3H .g.S+I.A.S,with parameters S = t, I -= ~ and ~I -=1·93±0·01, All ={l70±2)x10-4 em-I,Al. -= (55 ± 2) x 10-4 em-I, and with the z axis at 64° to the crystal c(OOOI) axis and at 74° to a crystal a axis.

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Section: Methodsmentioning

confidence: 99%

Electron Spin Resonance of V4+(VO2+) in Beryl

Hutton¹,

Darmann²,

Troup³

1991

Aust. J. Phys.

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“…Crystals formed in the five percent solution actually contained 0.015 molar percent of Mn2+, while those from the fifteen percent solution contained 0.155 molar percent Mn2+. Two EPR spectrometers with single crystal rotation facilities of the type described by Hutton and Seed (1966), and with liquid helium cryostats, were used. The microwave frequencies were 9.3 GHz, and 35 GHz.…”

Section: Methodsmentioning

confidence: 99%

Feasibility ofλ= 16μstimulated emission from a pulse-periodic DF–CO₂chemical laser

Biryukov¹,

Konoplev²,

Степанов³

et al. 1981

Sov. J. Quantum Electron.

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From a study of the EPR of Mn" in K,SO, as a function of temperature, Chowdari and Venkateswarlu reported a possible phase transition at 143 K. To test whether a phase transisition really occurs, the spectra due to Mn2+ in K,SO, have been re-examined in our laboratory as a function of temperature. It was found that the Mn2+ ions occupy two sites, which are quite different from those proposed by Chowdari and Venkateswarlu, and these have been identified and analysed in detail at 4.2, 77 and 300 K at both Xand Q-band frequencies. The variation of the spin hamiltonian parameters B: and B i for the site with the stronger spectrum has been determined throughout the temperature range 4.2-300 K. No evidence for any phase transition was found.

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A paramagnetic resonance study of Cr3+ and Fe3+ in sillimanite

Marshall¹,

Hutton²,

Troup³

et al. 1971

Phys. Stat. Sol. (a)

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The paramagnetic resonance spectra of W+ and Fe3+ in natural crystals of the mineral sillimanite have been investigated. The chromium results can be interpreted with a spin Hamiltonian having axial and rhombic terms. Four magnetically inequivalent (directionally) sites (Site I) are observed, with parameters g 1 = 1.975, 911 = 1.963, B: = 6.91, and Bi = 3.77 GHz. The iron results have been interpreted on the assumption that Fe3+ occupies the two crystallographically inequivalent A13+ sites in the sillimanite, Site I1 having tetrahedral coordination and Site 111 octahedral coordination. The constants of the conventional orthorhombic spin Hamiltonian are as follows, Site 11: B, O = 1.74 GHz, B; = = 1.62 GHz, Bi = 0.0 GHz, B: = 0.0 GHz, B: = 0.0 GHz, and g, = gar = gz = 2.004; Site 111: B: = 11.8 GHz, B; = 4.04 GHz, B: = 0.37 GHz, S i = 0.09 GHz, and g2 = g, = = g, = 2.004. A comparison of the results for the octahedrally coordinated sites in the three polymorphs kyanite, andalusite, and sillimanite is made. Die EPR-Spektren von W + und Fe3+ in naturlichen Kristallen des Minerals Sillimanit aurden untersucht. Die Ergebnisse an Chrom konnen mit einem Spin-Hamiltonian mit axialen und rhombischen Termen interpretiert werden. Vier magnetisch nichtaquivalente (Richtung) Pliitze (Platz I) werden beobachtet, mit Parametern g 1 == 1,975, 911 = 1,963, Bi = 6,91 und B; = 3,77 GHz. Die Ergebnisse a n Eisen werden mit der Annahme erklart, daB Fe3+ die beiden kristallographisch inaquivalenten A13 k-P1atze in Sillimanit -Platz I1 hat tetraedrische und Platz 111 oktaedrische Koordinationbesetzt. Die Konstanten des konventionellen rhombischen Spin-Hamiltonians sind fur Platz I1 : Bl = = 1,74 GHz, BZ = 1,62 GHz, B: = 0,O GRz, B4 = 0,O GHz, Bi = 0,O GHz und gz = = g, = gr = 2,004; fur PlatzIII: B, O = 11,s GHz, Bi = 4,04 GHz, Bi = 0,37 GHz, B: = = 0,09 GHz und g , = gy = gz = 2,004. Ein Vergleich der Ergebnisse fur die oktaedrisch koordinierten Platze wurde fiir die drei Polymorphe Cyanit, Andalusit und Sillimanit durchgefiihrt.

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Crystal rotation and orientation for electron spin resonance studies

Cited by 6 publications

References 5 publications

Electron Spin Resonance of V4+(VO2+) in Beryl

Electron Spin Resonance of V4+(VO2+) in Beryl

Feasibility ofλ= 16μstimulated emission from a pulse-periodic DF–CO₂chemical laser

A paramagnetic resonance study of Cr3+ and Fe3+ in sillimanite

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Crystal rotation and orientation for electron spin resonance studies

Cited by 6 publications

References 5 publications

Electron Spin Resonance of V4+(VO2+) in Beryl

Electron Spin Resonance of V4+(VO2+) in Beryl

Feasibility ofλ= 16μstimulated emission from a pulse-periodic DF–CO2chemical laser

A paramagnetic resonance study of Cr3+ and Fe3+ in sillimanite

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Feasibility ofλ= 16μstimulated emission from a pulse-periodic DF–CO₂chemical laser