C09-hints&helps

C09-hints&helps - Chem 227 Helps and Hints for...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem 227 Helps and Hints for Homework Assignment #9 Making a baseline correction is easy to picture but harder to program. The baseline can be established by picking a couple of regions on either side of a peak (or group of peaks) and performing a least squares fit through them to get an equation describing the baseline. To do this, however, you must copy the data points for the two regions to a section of a spreadsheet where they can be listed sequentially as a single array. If you use the slope and intercept functions instead of linest , you won = t need to worry about blank spaces, but you will still need to input both regions as a single array. Then it is a simple matter in a spread sheet to subtract a calculated baseline value from each data point across the peak (y corr,i = y i ! [m base x i + b base ]). What about picking the region to integrate over? Take as an example the two overlapping peaks in the figure below. Even though these two peaks strongly overlap, we can
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online