Fine Beam e/m System, He

Fine Beam e/m System, He

2,529.00

TEL 8481SYS3

  • 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 helium 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 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.

The magnetic field is provided by a set of Helmholtz coils, and the entire system is powered by a single power supply.

(Cables pictured are not included in the system.)

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TEL 8481SYS3

  • 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 helium 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 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.

The magnetic field is provided by a set of Helmholtz coils, and the entire system is powered by a single power supply.

(Cables pictured are not included in the system.)