1. Getting Those Darn Spectra
Into Excel
Bruce Phebus
Office Hours: PSB 341
Wednesday 2-3
Thursday Noon-1
2. First…
Everyone Complains About Measuring Spectra
Get Over It
I DON’T CARE
YOU NEED THIS SKILL
Whining will result in points off
The only wine you should have in you is
red or white*
*note we don’t advocate drinking before class or under age.
3. Ok Find a Ruler, no not an overlord
but a measurement device
1/cm = cm-1
4. So Now you have…
Length (cm) / wavenumber
Make Use of Multiple values!
Note that “cm” doesn’t mater it could be in pica’s for crying out loud!
Measure your Peaks more than once!
Error will go down with repeated
measurements
I can do this easily to decimal
wavenumbers aka 5 sigfigs!
7. Ready for the annoying part?
1/ cm = cm-1
You need peak Positions
For both sets of lines
This is up to you…
The nice thing is…
You only need to do one
sheet
9. How to remember P & R Branches!
BIGER Wave Numbers Mean:
• Smaller number in the denominator
• Which Means Shorter Wavelength
• Shorter Wavelengths' Mean
~Higher Energy!~
• Higher Energy Comes from a bigger transition
REMEMBER !
” is the lower state
’ is the upper state
10. Error Propagation &
Peak Intensities Next Time!
Don’t Fall Behind!
Things To think about for next time…
• How were values you got calculated?
• What are the uncertainties of your
measurements?
• Is your data organized, Labeled,
and easily understood by you?
• Don’t forget your Questions if you have them!
11. What you will have
Done by next time:
All Peaks in Excel
Aka wavenumbers
Peaks Assigned
Meaning P(?) & R(?)
Data Exchanged w/ Partners