Tomsk State University. Physical Department.
Laboratory of training physics experiment
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Superfine   Structure  and  Zeeman  Effect   Обратно  Далее  
The 546.1-nm green line is separated out by a two-prism spectrograph with 3-mm slit width, a Fabry - Perot etalon with 3.2-mm spacing being placed in the collimated beam between the prisms.The photograph of the hyperfine structure of the mercury line shown in figure was taken from the television screen. Along side the main line, due to the presence of mercury isotopes with even mass number (lines of the isotopes Hg198-204 with I=0), can be seen two satellites (lines of the isotope Hg199 with I=1/2). These satellites are spaced from the main line by 0.324 and 0.754 cm-1. The apparatus is best checked for adjustment in terms of the visibility of the hyperfine structure of the λ = 546.1-nm mercury line.

Two lines in the orange 577-579 nm are visible on the right side


The setup includes a PRK-4 mercury lamp located between the plane pole tips of an electromagnet. The anomalous Zeeman Effect is observed at a magnetic field of 9000 Oe. The 546.1-nm green line is separated out by an absorption filter, the Fabry-Perot etalon with 3.2-mm spacing being placed in the next position. As the magnetic field is gradually increased the line is observed to broaden, its brightness increases, and then it splits into components.

Introducing polaroids oriented parallel to the field gives the three central π components (see photograph); orienting the polaroids perpendicular to the field gives the σ components, which are located at the edges.

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