Electron Operating
Diffraction Tube with mounting 06721.00
Instructions
r--
CONTENTS 1. 2.
Purpose Description
and
3.0peration 4. Diffraction of 5. Electron optic carrier mesh 6. Fault levels 7. 8.
Additional Protection
9.
Experiment
10. 11.
Technical EauiDment
PURPOSE
1.
mode
electrons representation
information from rays literature data list
of
operation on
graphite of the
With the corpuscular electrons
electron and can
studied. experiments electrons,
In in the
diffraction particularly
on a crystal advantageous
-the
diffraction tube, wave characteristics be demonstrated
comparison with other the quantum physics of method of electron
diffracted
directly fluorescent
the of and
image
visible screen
with and
grid because: can the
proves
be help
made of
a
2
only test
one simple instrument
to is
operate, required.
compact
"" The electron the de-Broglie experimentally accuracy, dualism
diffraction principle and with
as a applicable
basis to
tube enables to be proved considerable
for wave electrons.
particle
Fig.2
2.
DESCRIPTION
The
electron
mounting supply be
AND MODE OF OPERATION
to units
diffraction
tube
which the and measuring
necessary equipment
has
a
power can
connected.
In the electron controlled,
electron beam
external,
diffraction produced it is
is as
experimental
tube, which can dependent
parameters.
electron diffraction tube system is shown schematically Thermionic cathode K is heating coil H. from the cathode electric
field
system deflects direction (optical
Gl
Wehnelt
The are
The
beam in heated
emission Fig. 2. by a
electrons accelerated
created
by
an be on
emitted in an the
grid
to G4. Wehnelt cylinder Gl a narrow electron bundle in the of the symmetrical axis axis). The electrons from the
cylinder
are
easily
3.
OPERATION
The
functional
diffraction
elements tube.s
(H, K, G! correspondlngly
to
of
beam
the
electron
emission
G4) connect marked sockets
mounting. The tube and form one unit which should If this does happen, then
system with on
the the
the mounting not be split. care must be
taken when the tube is re-fitted that the small connecting pins are not bent. It should also be noted that one of the sockets so that in
the
on the
the tube tube can
correct
way
mounting only be for
the
is sealed plugged in contact
arrangement.
accelerated
forward by Grid G2' which has a positive potential. Then the electrons flying through the opening at Grid G2 are accelerated very vigorously because of the strong positive potential at the anode, G3. Finally, Grid G4 is used to focus the electron beam, the anode, an electron system. The accelerated on a optical copper
film attached axis. This mesh on which
polycrystalline particles deflected degrees of the
providing, optic particles
vertically to the film consists of a there is a layer of
graphite. penetrate this film, from their path to
and enter the electron tube,
with lens land
spherical see also
As the they are varying section Fig. 5.
Where the electrons reach the inner of the glass sphere, they encounter
wall a ~
fluorescent layer. In areas where individual electrons land in clusters on the fluorescent layer, they produce a clearly visible luminescence, due to the fluorescent
rays.
Fig.3
3 Fig.
1"'"""'
3
shows
the
the electron a meter for
electrical
diffraction the anode
current is To power filtered
sufficient the other DC voltages
required. and values
The
Fig.3. anode
voltages can
power
for
taking
supply
The electrons deflected at the graphite have a de-Broglie wave length dependent on the anode voltage Ua' as follows:
heating. wellalways
voltage reproduced be
in AC
An
for the functions, are
individual are also
All voltage)
universal
wiring
tube, voltage.
(apart taken
ranges in
from the from a
11725.93. Where
The anode current 1 mA. Therefore, some 10 MQ (e.g. plug and socket,
should a limiter 10 MQ order
should generally the anode. If circuit
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not
far exceed resistor of resistor with no. 07160.00)
be wired a HV unit
current
