Facility for thermal helium desorption (THDS) measurements

Kautto, E; Kähkönen, O.-P.; Kuhalainen, J; Manninen, M.

doi:10.1016/0168-583x(95)00821-7

Cited by 6 publications

(8 citation statements)

References 13 publications

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“…This is true also for trapping and dissociation results for helium in copper [8][9][10][11]15]. When compared to desorption experiments, our result for the helium dissociation energy is in perfect agreement with them [13,16]. However, in the case of two and three helium atoms in a copper vacancy, our results are higher than the measured ones.…”

Section: Discussionsupporting

confidence: 83%

“…In thermal desorption experiments the measured quantity is just the dissociation energy. Experimental estimates of the dissociation energies for the helium-copper system are E D,H e = 2.1 eV, E D,2H e = 1.3 eV and E D,3H e = 0.9 eV [13]. These values are somewhat smaller than the calculated values.…”

Section: Trapping At Vacanciesmentioning

confidence: 54%

“…The obtained dissociation energy for the neon is quite high, much higher than that of argon. Indeed desorption experiments shows that in some cases neon peaks appear at slightly higher temperatures than argon peaks [13].…”

Section: Discussionmentioning

confidence: 99%

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Helium, neon and argon in copper studied with the effective medium theory

Kuhalainen¹,

Manninen²,

Kautto³

1996

J. Phys.: Condens. Matter

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Two-component effective medium theory (EMT) is applied to calculate binding, migration and dissociation energies of helium, neon and argon in bulk copper. Interstitial helium and neon prefer octahedral sites whereas argon sits about 0.5 Å off-centred in the octahedral site. Helium has the smallest migration energy, but, surprisingly, the migration energy of argon is smaller than that of neon. A vacancy in copper can bind three helium atoms or two neon atoms, but only one argon atom. Results are compared with those obtained from thermal desorption measurements.

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Section: Discussionsupporting

confidence: 83%

Section: Trapping At Vacanciesmentioning

confidence: 54%

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Helium, neon and argon in copper studied with the effective medium theory

Kuhalainen¹,

Manninen²,

Kautto³

1996

J. Phys.: Condens. Matter

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“…Finally, desorption experiments [3,4,16] have suggested that neon and argon have trapping sites near the surface. A persistent double peak in the measured spectra has been interpreted as trapping of argon atoms under the first few atomic layers of the surface.…”

Section: Discussionmentioning

confidence: 99%

Argon and neon trapping near copper surfaces

Kuhalainen¹,

Manninen²,

Kautto³

1998

J. Phys.: Condens. Matter

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The binding energies of argon and neon impurities trapped below copper surfaces have been studied using a two-component effective-medium theory. The impurities are placed at various interstitial and substitutional sites and at divacancies within the first few surface layers, and the local energy minima as well as diffusion paths have been calculated taking into account full relaxation of the copper atoms. The results differ clearly from those obtained for bulk copper and are different for different surfaces. The results suggest that argon and neon are diffusing out from copper via a vacancy mechanism, with the help of a divacancy, or the impurity-vacancy pair dissociates clearly below the surface layer.

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“…The facility for THDS measurements has been described earlier by Kautto et al [7]. When the pressure in the UHV chamber was less than 5.0 × 10 −6 Pa, the post-implanted samples were heated to 700 • C at a constant rate of 10 • C/min while monitoring the release rate of helium gas with a quadrupole mass spectrometer.…”

Section: Methodsmentioning

confidence: 99%