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Discussion and Debate
Discussion and Debate
Physical & Life Sciences
Meteorite has expert stumped.
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<blockquote data-quote="sjastro" data-source="post: 75860600" data-attributes="member: 352921"><p>In the coin thread the material was visible at λ = 254nm shortwave UV, not at λ = 365nm longwave UV.</p><p>This is a demonstration of quantum mechanics at work.</p><p>Whatever this material is photons at an energy E = h/λ where absorbed by the material sending electrons into higher energy levels.</p><p>On returning to the ground state visible light or fluorescence is observed.</p><p></p><p>The same mechanism applies to meteorites.</p><p>When it comes to longwave UV equipment the bandwidth of the emitted radiation is an important factor.</p><p>If it is too wide it can extend into the visible light region ≈ 400nm and one cannot be certain if fluorescence or reflected visible light is observed.</p><p>The <u>measured</u> radiation for the longwave UV torch I use indicates this is not a problem.</p><p></p><p style="text-align: center"><img src="https://www.ultravioletphotography.com/content/uploads/monthly_12_2017/post-150-0-47548000-1513599105.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p> <p style="text-align: center"></p><p>For extra insurance the torch comes with a light rejection filter in the 400 - 700 nm range which was also tested.</p><p></p><p style="text-align: center"><img src="https://www.ultravioletphotography.com/content/uploads/monthly_08_2018/post-4-0-46518800-1533927574.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>The only issue as I mentioned previously is too make sure reflected UV light does not reach the CMOS sensor of the camera which is UV sensitive.</p><p>This is not a problem with camera lenses which are coated, the microscope optics required the use of a UV rejection filter to work.</p><p></p><p>A good example is a suspect meteorite in my possession which Randy Korotev wanted tested is shown in the visible light vs longwave UV comparison microscopic image. </p><p></p><p style="text-align: center"><img src="http://members.iinet.net.au/~sjastro/astrophysics/Meteorite/Actual%20meteorite%20and%20suspect/Comparison_Closeup_suspect.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p> <p style="text-align: center"></p><p>There is absolutely no doubt in my mind the Bassikounou sample is fluorescent under longwave UV.</p></blockquote><p></p>
[QUOTE="sjastro, post: 75860600, member: 352921"] In the coin thread the material was visible at λ = 254nm shortwave UV, not at λ = 365nm longwave UV. This is a demonstration of quantum mechanics at work. Whatever this material is photons at an energy E = h/λ where absorbed by the material sending electrons into higher energy levels. On returning to the ground state visible light or fluorescence is observed. The same mechanism applies to meteorites. When it comes to longwave UV equipment the bandwidth of the emitted radiation is an important factor. If it is too wide it can extend into the visible light region ≈ 400nm and one cannot be certain if fluorescence or reflected visible light is observed. The [U]measured[/U] radiation for the longwave UV torch I use indicates this is not a problem. [CENTER][IMG]https://www.ultravioletphotography.com/content/uploads/monthly_12_2017/post-150-0-47548000-1513599105.jpg[/IMG] [/CENTER] For extra insurance the torch comes with a light rejection filter in the 400 - 700 nm range which was also tested. [CENTER][IMG]https://www.ultravioletphotography.com/content/uploads/monthly_08_2018/post-4-0-46518800-1533927574.jpg[/IMG][/CENTER] The only issue as I mentioned previously is too make sure reflected UV light does not reach the CMOS sensor of the camera which is UV sensitive. This is not a problem with camera lenses which are coated, the microscope optics required the use of a UV rejection filter to work. A good example is a suspect meteorite in my possession which Randy Korotev wanted tested is shown in the visible light vs longwave UV comparison microscopic image. [CENTER][IMG]http://members.iinet.net.au/~sjastro/astrophysics/Meteorite/Actual%20meteorite%20and%20suspect/Comparison_Closeup_suspect.jpg[/IMG] [/CENTER] There is absolutely no doubt in my mind the Bassikounou sample is fluorescent under longwave UV. [/QUOTE]
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