Name: methane

 Valence region:  methane1.jpg     (methane1.txt)

Closeup of first ionization band:  methane2.jpg     (methane2.txt)

Click on name of the jpg file to display a plot of the data.  To download the text format datafile to your computer, right-click on the hyperlink to the .txt file and select "Save Target As..."

Further Details
 The full valence region spectrum shown was taken with a He II source to show the second ionization band.

Reference