Getting Data From SpectraFirst Lets Make Sure:

We Are All On The Same Page

Bruce Phebus

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.

Ahh now to Linest!

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

What are we doing to today continued…

• We will calculate all of our constants!k = The spring constantDe

o = Dissociation EnergyRe = 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!

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!

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.

Next Week:• You should not be doing data

analysis you should be writing and making certain your data is correct.