𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Interferometrical measurements of the absorption of helium

✍ Scribed by H Gerritsen

Publisher
Elsevier Science
Year
1934
Weight
542 KB
Volume
1
Category
Article
ISSN
0031-8914

No coin nor oath required. For personal study only.

✦ Synopsis

By means of an interferometer of Fabry and Perot the ,,apparent" intensity distribution in each of the singulet lines of helium 2P--3D, 2.P--4D, 2P--SD and 2S--3P is measured. We suppose that the theoretical intensity distribution in the lines of our helium tube is mainly determined by the D o p p 1 e r-effect and selfabsorption; of the two parameters describing the line form, the temperature can be measured thermoelectrically and the absorption coefficient can be adjusted till the calculated curve agrees with the observed one. For the three lines, corresponding with transitions to the same final level 2'P, the ratio of the E i n s t e i n absorption coefficients (B..3 : B,4 : B~) can be derived.

πŸ“œ SIMILAR VOLUMES

Intensity measurements of helium lines i
Intensity measurements of helium lines in absorption
✍ H.C. Burger; H.P. van Cittert πŸ“‚ Article πŸ“… 1940 πŸ› Elsevier Science βš– 183 KB

The ratio of the absorption coefficients of two Helium lines is measured, and is found in satisfactory accordance with H y 11 e r a a s' theory.

Interferometric measurement of thermal e
Interferometric measurement of thermal expansion
✍ V. Kurzmann; J. StΓΆhr; M. Tochtrop; R. Kassing πŸ“‚ Article πŸ“… 1989 πŸ› Elsevier Science 🌐 English βš– 282 KB

The temporal and spatial propagation of heat in a dielectric medium has been studied by observing the thermal expansion using a differential laser interferometer which was initially built for profilometry. It is demonstrated that topographical and thermal information can be obtained simultaneously.