Register to reply

Negative absorbance reaading

by rick112
Tags: absorbance, negative, reaading
Share this thread:
Jul10-10, 02:24 PM
P: 7

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 if the negative reading is x that means it has so much of some component...
Phys.Org News Partner Physics news on
Three's a charm: NIST detectors reveal entangled photon triplets
How did evolution optimize circadian clocks?
New webcast series brings cutting-edge physics talks to the world
Jul10-10, 03:13 PM
P: 292
This sounds like a question for the spectrometer's manual perhaps...?
Jul10-10, 03:27 PM
P: 47
that means your measurement is not well calibrated. a negative absorption from an excited sample would indicate stimulated emission

Jul10-10, 11:32 PM
P: 137
Negative absorbance reaading

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.

Register to reply

Related Discussions
Absorbance for Purple Solution Chemistry 1
Absorbance or absorptance Classical Physics 0
Heat absorbance: PLS PLS HELP ASAP Introductory Physics Homework 1
Absorbance and Concentration Question Biology, Chemistry & Other Homework 4
Effect of pH changes on UV absorbance Chemistry 3