4500PC11 - cm-1 Center wavenumber of peak = cm-1...

Carbon Dioxide Absorption Peak
Using a Fourier Transform Infrared (FTIR) spectrometer, the spectrum of air ex-
hibits absorption resonances due to carbon dioxide ( CO
2
) and water vapor ( H
2
O ). The
absorption “Spectrum of Air” is shown in the class notes as a plot of percent transmit-
tance versus wavenumber, ν ,in cm
- 1
. From the plot of the spectrum, determine, for
the primary CO
2
absorption peak, the center wavenumber and the full-width-at-half-
maximum of the peak. Put your answers in the blanks provided. Express your answers
accurately to four signi±cant ±gures in