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
Wavelength scale
A photo of Mercury spectrum taken from eyepiece (click to enlarge)
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 range | 400 ~ 800 nm |
| Collimator focal length | Objective: 150 mm |
Telescope focal length | Objective: 150 mm |
| Eyepiece: 25 mm (low power); 12.5 mm (high power) | |
| Wavelength calibration tube | Objective 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 power | Distance 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. |
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
Wavelength scale
A photo of Mercury spectrum taken from eyepiece (click to enlarge)
