4—15.
X-RAY PHOTOELECTRIC EFFECTS
89 -
down inside the atoms of the material upon Which the X—rays
_
are impinging. The frequency of the X—rays can be measured by
;
the use of crystals or gratings and the kinetic energy of the ejecte‘d
electrons, the rst term on the right hand side of the equation, can
be measured in the following manner. In gure 4—13, a magnetic
photo—electrons
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FIG. 4—13… To measure the energyof x—ray photo-electrons.
_
feld'of strength H oersteds, perpendicular to the paper, bendsthe
.
electrons in a vacuum chamber into a
circular path of radius 1”.
Then
,
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,
;
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-—.Hev= mv/r.
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(2—1)
Also‘
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.
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m = m,,/‘\/l
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