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4hv.org :: Forums :: Electromagnetic Radiation
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Neon spectra by direct vision prism

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Physikfan
Fri Oct 21 2016, 11:45AM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
A Neon spectral tube as a light source, a direct vision prism as the spectroscopic device and a digital camera are used to record a neon spectrum.
A power supply delivers 5000V and a maximum of 2 mA, protection resistor is required!
NeonLamp2100x290

For demonstration of atomic spectra direct vision prisms are particularly suitable.
Three prisms of different refractive indices are arranged one behind the other, e.g. flint glass, crown glass, flint glass.

PrismaNeon1400x151
Exposure time around 1/150 second

PrismaNeon2400x150
Exposure time around 1/50

PrismaNeon3400x154
Exposure time around 1/10 second

PrismaNeon4400x156
Exposure time around 1 second

With increasing exposure time, the faint lines in green and blue are visible,
However, the strong red lines are then overexposed.

Please note the non-linear representation of the wavelength on the x-axis due to the nonlinear dependence of the refractive index of the glass prism as a function of the wavelength.

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Physikfan
Sun Oct 30 2016, 09:07PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Rays inside the direct vision prism:

Geradsichtprismabild
From Wikipedia


P1190270400x216
Used prism for recording the Neon spectra
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