Getting Those Darn Spectra Into Excel

Bruce PhebusOffice Hours: PSB 341Wednesday 2-3Thursday Noon-1

First…Everyone Complains About Measuring Spectra

Get Over It

I DON’T CAREYOU 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.

Ok Find a Ruler, no not an overlord but a measurement device

1/cm = cm-1

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

measurementsI can do this easily to decimal wavenumbers aka 5 sigfigs!

Remember which direction you are measuring from!

1/ cm = cm-1

Peak Heights!

1/ cm = cm-1

Ready for the annoying part?

1/ cm = cm-1

You need peak PositionsFor both sets of linesThis is up to you…

The nice thing is… You only need to do onesheet

From Shaowei’s slides

1/ cm = cm-1

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

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!

What you will have Done by next time:

All Peaks in Excel Aka wavenumbers

Peaks Assigned Meaning P(?) & R(?)

Data Exchanged w/ Partners