Nickel Related Absorption Lines in High-Pressure Synthetic Diamond

ABSTRACTDiamonds grown by the temperature gradient method using a nickel catalyst show an optical absorption band, extending from 2.5 eV to 2.56 eV, with a zero-phonon line at 2.51 eV. At 4 K this line exhibits fine structure; it is made up of 3 components at 2.509 eV, 2.510 eV and 2.511 eV. In absorption the fine structure components have the same relative intensity at different temperatures. We report on the effects of uniaxial stress on the zero-phonon transition at 77 K. We propose an interpretation of the results according to which the optical defect has a tetrahedral symmetry, and the 2.51 eV line occurs between two T2 states.

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Optical Study of the Fe3+-Related Emission at 0.5 eV in InP:Fe

MRS Proceedings ◽

10.1557/proc-262-301 ◽

1992 ◽

Vol 262 ◽

Author(s):

Klaus Pressel ◽

G. Bohnert ◽

A. Dörnen ◽

K. Thonke

Keyword(s):

Fourier Transform ◽

Fine Structure ◽

Charge Transfer ◽

Transfer Process ◽

Decay Time ◽

Optical Study ◽

Charge Transfer Process ◽

Excitation Mechanism ◽

Different Temperatures ◽

A Charge

ABSTRACTThe 0.5 eV (2.5 μm 4000 cm1) emission band in InP has been studied by optical spectroscopy. By the use of Fourier-transform-infrared photoluminescence we have been able to observe at least a three-fold fine structure in the zero-phonon transitions at ∼ 4300 cm−1 which are studied at different temperatures. Based on the fine structure and the long decay time of 1.1 ms we ascribe the 0.5 eV emission to the 4T1 → 6A1 spin-flip transition of Fe3+. The excitation spectrum of this Fe3+-related emission shows a characteristic fine structure at ∼ 1.13 eV which belongs to a charge-transfer process of the type: Fe3+ + hv (1.13 eV) → [Fe2+, bound hole]. We discuss the excitation mechanism of the 0.5 eV emission by charge-transfer states and compare the results with an emission at 3057 cm1 in GaAs, which we attribute to the same Fe3+ transition (decay time: 1.9 ms).

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Effect of High Pressure Processing at Different Temperatures on Protein Functionality of Porcine Blood Plasma

Journal of Food Science ◽

10.1111/j.1365-2621.2000.tb16033.x ◽

2000 ◽

Vol 65 (3) ◽

pp. 486-490 ◽

Cited By ~ 14

Author(s):

D. Pares ◽

E. Saguer ◽

M. Toldra ◽

C. Carretero

Keyword(s):

High Pressure ◽

Blood Plasma ◽

High Pressure Processing ◽

Protein Functionality ◽

Porcine Blood ◽

Different Temperatures

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Role of temperature in the numerical analysis of CaO under high pressure

Open Chemistry ◽

10.2478/s11532-009-0117-9 ◽

2010 ◽

Vol 8 (1) ◽

pp. 126-133 ◽

Cited By ~ 4

Author(s):

Purvee Bhardwaj ◽

Sadhna Singh

Keyword(s):

Phase Transition ◽

High Pressure ◽

Numerical Analysis ◽

Thermodynamic Properties ◽

Elastic Constants ◽

Volume Change ◽

Thermodynamical Properties ◽

Phase Transition Pressure ◽

Different Temperatures

AbstractIn this paper we focus on the elastic and thermodynamic properties of the B1 phase of CaO by using the modified TBP model, including the role of temperature. We have successfully obtained the phase transition pressure and volume change at different temperatures. In addition elastic constants and bulk modulus of B1 phase of CaO at different temperatures are discussed. Our results are comparable with the previous ones at high temperatures and pressures. The thermodynamical properties of the B1 phase of CaO are also predicted.

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