1. Getting Data From Spectra
First Lets Make Sure:
We Are All On The Same Page
Bruce Phebus
2. What you should have:
If you don’t you are way Behind!
• Wavelengths calculated for all the peaks
on your spectrum
• Peaks assigned to R and P branches
J” & J’ values assigned to each peak.
• All your data organized, labeled, and given
to your lab partners.
4. What are we doing to today?
• We will calculate all of our constants!
ωe ωexe Be α
• We will have reduced mass, μ, for each of
our isotopes H79Br & H81Br
• Isotopic abundance Br 79 is 50.7%
• Isotopic abundance Br 81 is 49.3%
Label 79 and 81 peaks
• Uncertainties as well
5. What are we doing to today
continued…
• We will calculate all of our constants!
k = The spring constant
De
o = Dissociation Energy
Re = Bond length
• Shaowei’s slides have the equations!
“Data Analysis and Lab Report”
• Note k and k the Boltzmann constant are
not the same even though they look it on
his slides!
6. Questions Ask Them!
• Make sure you keep up with
the pace of the class as we
don’t meet often falling behind
one day means falling behind a
week!
• Do Differential Error Prop Now!
7. On the Subject of Reff’s:
• You need to look up references for
your reports
–They are a graded portion of your
report
• A hint for the HBr report “T.A. Ford”
– Very handy but you can’t use the reference.
– “A third year chemistry project” doesn’t count
as citation worthy science. You figure it out.
8. Next Week:
• You should not be doing data
analysis you should be writing
and making certain your data
is correct.
