Introduction to the Physics of Highly Charged Ions

Beyer, H F; Shevelko, V. P.

doi:10.1887/0750304812

Cited by 134 publications

(48 citation statements)

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“…2 This angular distribution may provide important clues about the bremsstrahlung mechanisms of radiation. The thick solid line is the angular distribution of x-ray emission expected from the ordinary bremsstrahlung process, 12 proportional to: sin…”

Section: Mechanisms Of X-ray Emission From Peeling Adhesive Tapementioning

confidence: 99%

Mechanisms of x-ray emission from peeling adhesive tape

Constable

Horvat

Lewis

2010

Applied Physics Letters

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It has previously been reported that x-rays are emitted when adhesive tape is peeled in a vacuum but no account of the dependence of the x-ray emission on the pressure of the environment has been given to date. In this paper we present detailed experimental data on the number and angular distribution of x-ray photons as a function of pressure. We find that x-rays are emitted for pressures between p0=10−3 and p1=10−2 mBar, with ∼106 counts/(cm2 s) recorded by a 256×256 pixel2 silicon array sensor placed 35 mm from the tape. The main role of the tape is found to be the build-up of an acceleration potential sufficient to produce x-rays by bremsstrahlung of free electrons in a low-pressure gas. The source of the free electrons is the gas. Our model shows that the production rate of uncompensated tape charge and absorption of positive ions from the gas define p1. The angular distribution of the radiation shows a pressure-independent 20° wide peak in the direction perpendicular to electron motion. Ordinary bremsstrahlung cannot describe this peak.

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Section: Mechanisms Of X-ray Emission From Peeling Adhesive Tapementioning

confidence: 99%

Mechanisms of x-ray emission from peeling adhesive tape

Constable

Horvat

Lewis

2010

Applied Physics Letters

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“…The second-order Zeeman effect is slightly more complicated, since it may depend on the particular fine or hyperfine structure of the ion. Nevertheless it will generally be suppressed in HCIs due to a larger energy denominator [44]. As a result of the reduced…”

Section: Discussionmentioning

confidence: 99%

Testing spatial α-variation with optical atomic clocks based on highly charged ions

Berengut

Flambaum

Ong

2013

EPJ Web of Conferences

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Abstract. We review recent works illustrating the potential use of highly charged ions as the basis of optical atomic clocks of exceptional accuracy and very high sensitivity to variation of the fine structure constant, . The tendency towards large transition energies in highly charged ions can be overcome using level crossings, which allow transitions between different orbitals to be within the range of usual lasers. We present simple scaling laws that demonstrate reduced systematics that could be realised in highly charged ion clocks. Such clocks could allow us to corroborate astronomical studies that suggest a spatial gradient in values of across the Universe.

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“…We calculate the dynamic multipole polarizabilities using the following relation which can be expressed in terms of a sum over all intermediate states including the continuum ( [47,48], and references therein)…”

Section: Computational Notesmentioning

confidence: 99%

“…To find the best values of the model potential parameters, we follow our earlier works [1,44,45,[47][48][49][50]. For Li system, the best values of the parameters for all the partial-wave states are δ 1 = δ 2 = δ 3 = 1 6559.…”

Section: Computational Notesmentioning

confidence: 99%