Výsledky vyhledávání - "P. G. Dawber"

Autor: J. Byrne, P. G. Dawber

Publikováno v: AIP Conference Proceedings.

We discuss the application of the ion trapping technique to measure both the neutron lifetime and the spectrum of recoil protons in unpolarized neutron β-decay.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::487a8b28ebd2f00836da035894999c2f
https://doi.org/10.1063/1.57455

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The magnetic field dependence of the AC susceptibility of powdered cerium magnesium nitrate between 4 and 1 K

Autor: C. B. P. Finn, K. Kiymac, P. G. Dawber

Publikováno v: Journal of Low Temperature Physics. 35:153-163

AC measurements at 21 Hz of the magnetic susceptibility of powdered cerium magnesium nitrate between 4.2 and 1.1 K are reported together with the dependence of this susceptibility on the magnitude of the measuring magnetic field. It is found that, be

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c516df880f4f073b1badacab2c56db6c
https://doi.org/10.1007/bf00121727

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Theory of alloys: Energy-dependent potentials for real alloys

Autor: P G Dawber, J P R Bolton

Publikováno v: Journal of Physics F: Metal Physics. 5:2079-2088

The authors extend the method of energy-dependent potentials introduced by one of the authors in an earlier paper (Clark and Dawber, ibid., vol.2, p.930 (1972)) to study the properties of random binary alloys. Some of the approximations made in that

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ed5863baf33e15d61a58fed9e9cd1f27
https://doi.org/10.1088/0305-4608/5/11/019

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Assessment of damage ranges by measurements of the refractive index in ion implanted LiNbO3 and LiTaO3

Autor: A. Fatk, P.D. Townsend, P. G. Dawber, D.J. O'Connor

Publikováno v: Radiation Effects. 64:235-240

Ion implantation in LiNbO3 and LiTaO3 produces radiation damage by nuclear collisions. The amorphisation of the lattice reduces the refractive index of the material. In the case of fast ion bombardment with helium this damage layer is buried below th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9cc732f212805bf7bfc2edc4ae2ab64e
https://doi.org/10.1080/00337578208223018

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Crystal-field splitting in dysprosium ethyl sulphate-an infrared and theoretical investigation

Autor: C B P Finn, H Jamshidi, P G Dawber

Publikováno v: Journal of Physics C: Solid State Physics. 17:6735-6748

A detailed experimental study in the near infrared has been made of the low-lying excited states of Dy3+ in the ethyl sulphate lattice. The results, which were obtained using different forms of polarised light and the technique of magnetic circular d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4457f19085358ed6a330713a97c77bf4
https://doi.org/10.1088/0022-3719/17/36/026

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The specific heat and resistivity of dilute non-magnetic alloys of the noble metals

Autor: P G Dawber, R E Turner

Publikováno v: Proceedings of the Physical Society. 88:217-230

In this paper we formulate a general theory for dilute alloys using a Green function approach. The solute atoms are assumed to be randomly distributed. Expressions for the density of states and the total transition probability for scattering are obta

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::836b7dcc070374cf5132591eae5f5d93
https://doi.org/10.1088/0370-1328/88/1/325

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Theory of L bands in face-centred cubic alkali halides

Autor: P G Dawber, I M Parker

Publikováno v: Journal of Physics C: Solid State Physics. 3:2186-2199

The L band absorption spectra observed in alkali halides is considered to arise from transitions from the ground state of the F centre to localized excited states arising from conduction band wave functions of higher energy. These localized states ar

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3932ec0b0ef8c8cc2ec925550c8d0a54
https://doi.org/10.1088/0022-3719/3/10/022

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Theory of Optical Absorption by Vibrations of Defects in Silicon

Autor: R J Elliott, P G Dawber

Publikováno v: Proceedings of the Physical Society. 81:453-460

Using the theory of the nature of lattice vibrations around an impurity of different mass in a cubic crystal, detailed calculations are made of the optical absorption expected from compensated group III and group V impurities in Si due to creation of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5d67ca3bad1c08bd8dfdbd05f408fbf8
https://doi.org/10.1088/0370-1328/81/3/309

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Theory of alloys, a coherent pseudopotential model

Autor: P G Dawber, J A Clark

Publikováno v: Journal of Physics F: Metal Physics. 2:930-938

The authors present a model for predicting the properties of a random alloy AxBy. A method is developed for finding an effective energy dependent potential, localized on a single site in the Wannier representation, to describe the effect of a B atom

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cace7a02c909c8f2cabfccaa4c17b98f
https://doi.org/10.1088/0305-4608/2/5/017

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The vibrations of an atom of different mass in a cubic crystal

Autor: R. J. Elliott, P. G. Dawber

Publikováno v: Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences. 273:222-236

The modes of vibration of an atom of different mass substituted in a cubic crystal without change of force constant are studied by the Green function method of Lifshitz. In particular, explicit formulae involving only the density of states of the per

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bd8f1d8f7d93edf1d8c5f73f255ef3f4
https://doi.org/10.1098/rspa.1963.0084

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