1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Negative absorbance reaading

  1. Jul 10, 2010 #1

    i know this is kind of a basic question..but what in reality does a negative absorbance reading means?? why cant the spectrometer just say its out the reading range or something??
    does a negative reading really say something can we look at it and detect something...like if the negative reading is x that means it has so much of some component...
  2. jcsd
  3. Jul 10, 2010 #2
    This sounds like a question for the spectrometer's manual perhaps...?
  4. Jul 10, 2010 #3
    that means your measurement is not well calibrated. a negative absorption from an excited sample would indicate stimulated emission
  5. Jul 10, 2010 #4
    It seems like the spectrometer needs to be calibrated. It's like pushing the zero or tare on a balance. You manually set which point is called zero and the device reads other values with respect to that.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook