Dielectric relaxation of crypto-phenols by internal rotation

Isnard, R.; Gilchrist, John

doi:10.1016/0301-0104(80)85189-5

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…A, can be evaluated for specific potentials: two overlapping harmonic potentials in two and three dimensions (Mertzbacker 1970, Phillips 1981b) and Mathieu's equation for a rigid rotator in two-fold and three-fold potentials (Isnard and Gilchrist 1981) are typical examples. The results all imply a similar exponential dependence of A, on the barrier height and well separation, although precise numerical values change from one model to another.…”

Section: Static Descriptionmentioning

confidence: 99%

Two-level states in glasses

1987

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This review covers a wide range of experimental and theoretical studies of two-level or tunnelling states in glasses. Emphasis is on fundamental physics rather than a detailed comparison of experiment and theory. Sections cover the static and dynamic properties of tunnelling states, their contribution to thermal properties and their response to weak and strong electric and acoustic fields, both steady state and pulsed. A section on metallic glasses focuses on the importance of electron tunnelling-state interactions, and a final section illustrates approaches to a microscopic description by means of selected examples.

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Section: Static Descriptionmentioning

confidence: 99%

Two-level states in glasses

1987

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“…A 3-fold degenerate rotor potential has three solutions in the localized basis, the k = 0 ground state and the k = ±1 doubly degenerate first excited state solutions, where only the k = -1 state is not determined from solution of the Mathieu equation. Thus, this approach provides a valid approximation for determining Δ 0 of a 3-fold degenerate rotor [30].…”

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confidence: 96%

Bulk and Surface Tunneling Hydrogen Defects in Alumina

et al. 2013

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We perform ab initio calculations of hydrogen-based tunneling defects in alumina to identify deleterious two-level systems (TLS) in superconducting qubits. The defects analyzed include bulk hydrogenated Al vacancies, bulk hydrogen interstitial defects, and a surface OH rotor. The formation energies of the defects are first computed for an Al- and O-rich environment to give the likelihood of defect occurrence during growth. The potential energy surfaces are then computed and the corresponding dipole moments are evaluated to determine the coupling of the defects to an electric field. Finally, the tunneling energy is computed for the hydrogen defect and the analogous deuterium defect, providing an estimate of the TLS energy and the corresponding frequency for photon absorption. We predict that hydrogenated cation vacancy defects will form a significant density of GHz frequency TLSs in alumina.

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Dielectric relaxation of alcohols by internal rotation

Isnard¹,

Gilchrist²

1980

Chemical Physics

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Dielectric relaxation of crypto-phenols by internal rotation

Cited by 6 publications

References 10 publications

Two-level states in glasses

Two-level states in glasses

Bulk and Surface Tunneling Hydrogen Defects in Alumina

Dielectric relaxation of alcohols by internal rotation

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