Anisotropy of the Distribution of Annihilation Photon Pair Momenta for Multilayer Aluminium-Aluminium Oxide System

Ewertowski, R.; Świątkowski, W.

doi:10.1088/0031-8949/35/5/029

Cited by 7 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the literature one can find an attempt to infer the positron diffusion process from measurements of the positron annihilation characteristic of a layered sample produced by vapor deposition [3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Positron Diffusion Process Studied in Multilayer Systems

Dryzek

2002

phys. stat. sol. (b)

View full text Add to dashboard Cite

Results of positron annihilation measurements in multilayer systems with stacking sequence of copper, silver or nickel layers are presented. The layers were produced by dc electrodeposition. Great attention was paid to the positron diffusion in homogeneous areas. The results of experiments with solely copper layers meet the predictions of the so-called diffusion trapping model (DTM). When a thin layer of another metal separated the copper layers, only qualitative agreement with this model was found. The author was successful in establishing the value of the positron diffusion length in a layer of electrodeposited copper, i.e. (102 AE 20) nm, being close to that of positron beam experiments. From the analysis of the experiment it was concluded that the grain boundary in copper contains voids which effectively localized positrons. The type of voids depends on the type of metal separating the copper layers.

show abstract

Section: Introductionmentioning

confidence: 99%

“…The DTM predicts the dependence of the mean positron lifetime and the S-parameter on the grain radius R, Eqs. (1), (3), and the infinity series of the lifetime components in the positron lifetime spectrum, Eq. (2).…”

Section: A Brief Introduction To the Theorymentioning

confidence: 99%

The Positron Diffusion Process Studied in Multilayer Systems

Dryzek

2002

phys. stat. sol. (b)

View full text Add to dashboard Cite

show abstract

“…The ACAR and positron lifetime measurements for similar metal-dielectric sample indicated the possibility of positron trapping at the interface of such a kind [2,3]. These two effects: directional action of metal-metal contact and positron trapping at metal-dielectric interface can be expected from the analysis of the positron potential energy shape in the vicinity of the interface.…”

Section: Introductionmentioning

confidence: 84%

Does the Dielectric-Dielectric Interface Affect the Positron Diffusion Current?

Beliczyński¹,

Dębowska²,

Świątkowski³

1993

Acta Phys. Pol. A

View full text Add to dashboard Cite

The angular correlations of annihilation radiation have been measured for NaI, NaF and (NaI)0.65(NaF)0.35 alloy. The angular correlations of annihilation radiation for the alloy appeared to be more similar to the one for NaI than it should be expected from the content of NaI in the alloy. The result can be easily explained by assuming that NaI/NaF interface acts directionally on positron diffusion movement.

show abstract

“…The basis of the interpretation of the results obtained in [4][5][6] was the assumption that there exists a potential "trough" for positrons at a metal-dielectric interface, and that positrons reaching the interface during their diffusive movement in a metal can be trapped in the "trough". Of course one can not exclude other possibilities for the positron reaching the interface.…”

Section: Positron Motion At Metal-dielectric Interfacementioning

confidence: 99%

“…One consequence of such trapping was the expectation of an anisotropy of the distribution of momenta of photon pairs appearing when the surfacely trapped positrons annihilated. Using multilayer metal-dielectric samples and orienting them in two ways with respect to the pair-momentum annihilation spectrometer axis we had observed such anisotropy [4,5]. Another expectation was a possibility that the trapping of the positrons at the interface could give a special component in the positron lifetime spectum.…”

Section: Introductionmentioning

confidence: 99%