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Tried finding out what this symbol means, but to no avail did not find it. Help!

  1. Feb 15, 2012 #1

    Recently I've started an experiment called Quantum Wells, I was reading the lab script and came across a familiar looking symbol but could not put my finger on to what it means.

    The symbol in question is: Å (an upper-case "A" with a hollow dot [circle] just above of it)

    Here's the context: "CdS/ZnS as a function of well width from 3 Å to 60 Å (Ev = 0)"

    My question is what does this Å symbol mean? (Natural unit, definition, SI unit...etc)

    Thank you in advance. :smile:
  2. jcsd
  3. Feb 15, 2012 #2


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    That is 1 Angström. One Angström is 0.1 nm.
  4. Feb 15, 2012 #3


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    Staff: Mentor

    More precisely, 1 Ångström. :smile:

    For the benefit of the original poster, Ångström was a Swedish physicist, and the "A with a ring" is a feature of the Swedish, Danish and Norwegian languages.
  5. Feb 15, 2012 #4


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    I thought it was the 7th chevron for dialing Earth!
  6. Feb 15, 2012 #5


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    I think the symbol you're thinking of looks like a lambda with a circle on top, not like an Å, which by the way isn't really an A with a circle on top. It's a different letter, the one that comes after Z in the Swedish alphabet. Swedes pronounce it roughly the same way the British pronounce "aw" (as in "awful").
    Last edited: Feb 15, 2012
  7. Feb 15, 2012 #6
    It's angstrom i.e 10^-10 m.

    Call it a coincident but during yesterday's lab work I forgot to but that "dot" over A which then my professor pointed out to me .
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