Optical measurements of the density of helium in small bubbles in aluminium films

S. E. Donnelly; J. C. Rife; J. M. Gilles; A. A. Lucas

doi:10.1016/0022-3115(80)90205-6

Optical measurements of the density of helium in small bubbles in aluminium films

S. E. Donnelly, J. C. Rife, J. M. Gilles, A. A. Lucas

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Abstract

Some preliminary measurements are reported on the density of helium in bubbles in metal films using optical spectroscopy in the far vacuum ultra-violet. The technique consists of measuring (by transmission through the films) the optical absorption resulting from the transition 1¹ S₀ → 2¹ P₁ due to the helium in the bubbles. This transition, in a rarefied gas, occurs at 584 Å (21.2eV) but because of the gas density in the bubbles is observed to be broadened and shifted to higher energy (blue shifted). The measurements imply, for specimens with high gas concentrations (0.5–3 at% He), a gas density in the bubbles greater than 10²³ atoms cm⁻³.

Original language	English
Pages (from-to)	767-772
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	93-94
DOIs	https://doi.org/10.1016/0022-3115(80)90205-6
Publication status	Published - 1 Oct 1980
Externally published	Yes

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title = "Optical measurements of the density of helium in small bubbles in aluminium films",

abstract = "Some preliminary measurements are reported on the density of helium in bubbles in metal films using optical spectroscopy in the far vacuum ultra-violet. The technique consists of measuring (by transmission through the films) the optical absorption resulting from the transition 11 S0 → 21 P1 due to the helium in the bubbles. This transition, in a rarefied gas, occurs at 584 {\AA} (21.2eV) but because of the gas density in the bubbles is observed to be broadened and shifted to higher energy (blue shifted). The measurements imply, for specimens with high gas concentrations (0.5–3 at% He), a gas density in the bubbles greater than 1023 atoms cm−3.",

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AU - Donnelly, S. E.

AU - Rife, J. C.

AU - Gilles, J. M.

AU - Lucas, A. A.

PY - 1980/10/1

Y1 - 1980/10/1

N2 - Some preliminary measurements are reported on the density of helium in bubbles in metal films using optical spectroscopy in the far vacuum ultra-violet. The technique consists of measuring (by transmission through the films) the optical absorption resulting from the transition 11 S0 → 21 P1 due to the helium in the bubbles. This transition, in a rarefied gas, occurs at 584 Å (21.2eV) but because of the gas density in the bubbles is observed to be broadened and shifted to higher energy (blue shifted). The measurements imply, for specimens with high gas concentrations (0.5–3 at% He), a gas density in the bubbles greater than 1023 atoms cm−3.

AB - Some preliminary measurements are reported on the density of helium in bubbles in metal films using optical spectroscopy in the far vacuum ultra-violet. The technique consists of measuring (by transmission through the films) the optical absorption resulting from the transition 11 S0 → 21 P1 due to the helium in the bubbles. This transition, in a rarefied gas, occurs at 584 Å (21.2eV) but because of the gas density in the bubbles is observed to be broadened and shifted to higher energy (blue shifted). The measurements imply, for specimens with high gas concentrations (0.5–3 at% He), a gas density in the bubbles greater than 1023 atoms cm−3.

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SN - 0022-3115

ER -

Optical measurements of the density of helium in small bubbles in aluminium films

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