Physics Lab Equipment

      LEOI-96-3.jpg

Configuration of Kirchhoff Bunsen spectroscope

1. Prism chamber, 2. Wavelength graduation tube, 3. Wavelength scale adjust screw, 4. Collimator, 5. Narrow slit, 6. Plane mirror, 7. Right angle prism, 8. Slit width adjust screw, 9. Post, 10. Base, 11. Supporting stage, 12. Hand wheel, 13. Telescope support plate, 14. Eyepiece, 15. Telescope


    LEOI-96 Kirchhoff Bunsen Spectroscope.png

Wavelength scale

   LEOI-96 Spectrum.jpg

A photo of Mercury spectrum taken from eyepiece (click to enlarge)

LEOI-96 Kirchhoff Bunsen Spectroscope

LEOI-96 Kirchhoff Bunsen Spectroscope

Introduction

This basic spectrometer is an experimental instrument, consisting of collimator, telescope, dispersion prism, wavelength calibrated scale, and stand. It provides a high quality optical system and an easy-to- read scale, allowing to measure discrete atomic spectral lines. It can be used to illustrate the construction of a spectroscope, observe and measure the wavelengths of emission and absorption spectral lines. Especially, combined with our Hydrogen-Deuterium lamp (LLE-8) the wavelengths of Balmer series of Hydrogen atoms can be measured and then the Rydberg and Planck's constants can be determined (please refer to the Manual).


Specifications

Wavelength range400 ~ 800 nm
Collimator focal lengthObjective: 150 mm


Telescope focal length

Objective: 150 mm
Eyepiece: 25 mm (low power); 12.5 mm (high power)
Wavelength calibration tubeObjective focal length 100 mm



Minimum graduation of 

wavelength scale

400 - 500 nm: 2 nm
500 - 600 nm: 5 nm
600 - 700 nm: 10 nm
700 - 800 nm: 20 nm


Dispersion prism

Angle 60°
Side length: > 32 mm


Resolving power

Mercury doublet 577 nm and 579 nm using low-power eyepiece
Sodium doublet 589 nm and 589.6 nm using high-power eyepiece
Dispersion powerDistance between spectral lines 656.3 nm and 434 nm of hydrogen atom is 9 mm at the focal plane of the telescope. Average line dispersion power is 24.7 nm/mm.


      LEOI-96-3.jpg

Configuration of Kirchhoff Bunsen spectroscope

1. Prism chamber, 2. Wavelength graduation tube, 3. Wavelength scale adjust screw, 4. Collimator, 5. Narrow slit, 6. Plane mirror, 7. Right angle prism, 8. Slit width adjust screw, 9. Post, 10. Base, 11. Supporting stage, 12. Hand wheel, 13. Telescope support plate, 14. Eyepiece, 15. Telescope


    LEOI-96 Kirchhoff Bunsen Spectroscope.png

Wavelength scale

   LEOI-96 Spectrum.jpg

A photo of Mercury spectrum taken from eyepiece (click to enlarge)

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