Beyond the Visible

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  • Interaction of EMR with target

    Posted by HYPERedu on November 24, 2021 at 1:52 pm

    This is the official discussion topic on Interaction of EMR with target. Feel free to ask your questions related to this topic or give feedback.

    HYPERedu replied 6 months, 3 weeks ago 2 Members · 2 Replies
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  • Sunmeet Bhatia

    March 2, 2022 at 4:35 am

    Thank you for this great resource, it has proven to be very valuable.

    ‘Electron transfer processes require a lot of energy, thus the bands caused by them are broad.’

    By ‘bands’, does the narrator mean reflected radiation? And why would they be broad? Is it beacuse most of high energy wavelengths are absorbed?

    Sorry if stupid question, this is not my background. Thanks! 🙂

    • HYPERedu

      March 11, 2022 at 12:25 pm

      Hi Sunmeet, with “bands”, in this case, we mean absorption features (absorbed radiation in a specific wavelength region, causing a “depression” in the reflectance spectrum). I see that this can be misleading in the context of the MOOC but this is how it is referred to in the literature. The electronic transition consumes more energy while vibrational processes are less energy consuming, therefore, electronic transitions tend to cause larger absorption bands, whereas vibrational transitions are narrower. There are some more details on causes for specific bands of specific materials (mostly minerals) e.g. in Clark 1999 and Hunt 1977 (full references given in the reference list 3.6 Spectral reflectance of surface materials
      Geology/Minerals). I hope that helps. :). Arlena