TEL-Atomic - Determination of e/m

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Determination of e/m

Determine e/m
Confirm negative polarity of the electron
Deflection of electrons in magnetic field—Lentz’s Law
Determine magnetic field as function of the acceleration voltage at a constant fine beam diameter

Using the gas filled tube, the deflection of electron beams in a uniform magnetic field (with the use of Helmholtz coils) provides a means of quantitatively determining the charge-to-mass ratio of the electron, e/m.

The tube’s n electron beam system consists of an indirectly heated oxide cathode, a Wehnelt cylinder and a perforated anode, in neon residual gas at a precisely set pressure. Integrated measurement marks for parallax-free determination of the diameter of the fine beam is also part of the electron beam assembly. Ionization of the gas atoms along the path of the electron produces a sharply defined, visible fluorescent beam. The tube is mounted on a base.

Specifications
Gas	Neon
Gas pressure	1.3X10E-5
Filament voltage	4-14V AC/DC
Filament current:	300-450 mA
Wehnelt voltage:	0 – 50V
Anode voltage:	200-300 V
Anode voltage:	<0.3mA
Diameter of fine beam path:	20 –120 mm
Division spacing:	20 mm
Tube diameter:	160 mm
Total height including base:	260 mm
Base plate:	115X115X35 mm
Weight:	820 g

TEL 8481420 e/m tube with base

$985

Helmholtz Coils

The Helmholtz coils are designed for use with the e/m tube. The coils can be switched to in parallel or in series. A spring clip on the top crossbar can be used to mount a Hall sensor for magnetic field measurements.

Specifications
Coil diameter:	295 mm
Coil spacing:	150 mm
Turns per coil:	124
DC resistance	1.2 Ohms each
Maximum coil current:	5 amps
Weight:	4.1 Kg

TEL 8481500 Helmholtz coils

$545

Additionally required:
High voltage DC Power supply TEL U8521371
Low voltage DC power supply GP4303D
Connecting leads

Complete e/m system

The complete e/m system consists of the TEL 8481420 e/m Tube and Base, the TEL 8481500 Helmholtz coils, the TEL U8521371 high voltage supply for the tube, and the TEL GP4303D low voltage-high current supply for the Helmholtz coils. (not shown)

TEL 8481SYS Complete e/m System

$2681

Fine Beam tube, without base
Tube only for the e/m system.

TEL U8481440 e/m tube only

$820

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