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Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
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Posts: 304
Hi Proud Mary
The best way to analyze the minerals is to use
1. a mass spectrometer for the elements 2. x-ray diffraction for the structure 3. Raman scattering for additional information
Unfortunately I have no direct access to method 2, method 1 would destroy the tube, also Raman is not easy.
In this case electron excited fluorescence of these minerals generates these nice colors. I will post a picture of these minerals under daylight as well in the near future under UV light.
If it is possible I will also try to record the visible spectra of the fluorescence of the different minerals using a direct vision prism.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Proud Mary
The images show these minerals in the Geissler tube with UV lighting. Camera Lumix FZ20.
Not all minerals, that exhibit electron excited fluorescence, show also fluorescence under ultraviolet light. However, due to UV-glass absorption, only relatively long-wave UV rays can hit these minerals.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Proud Mary
The images show minerals in a Geissler tube (rotated by 180 ° against all previous pictures) with artificial light (LED) as well as in the dark. The exposure time was the same for all shots, manual focus, camera Canon 40D, Telephoto lens with 250 mm focal length.
With LED light with discharge, induction coil step 1. With LED light with discharge, induction coil step 5.
In the dark with discharge, induction coil step 1. In the dark with discharge, induction coil step 5.
Hopefully, I will soon be able to obtain spectroscopic images with a transmission grating or a direct vision prism.
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Luminescence of minerals by cathode rays
