Spectroscopy: clarification about doppler shift

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The discussion focuses on understanding the Doppler Effect in the context of spectroscopy, particularly with Rubidium and laser excitation. The user seeks clarification on how to observe the Doppler shift related to the deeper peak in their oscilloscope output and how to calculate it. There is confusion about whether the Doppler shift is the inverse of the full width at half maximum (FWHM) of the peak. Additionally, questions arise regarding the application of the triangular wave input and whether Rubidium exhibits piezoelectric properties. Overall, the conversation emphasizes the need for a clearer understanding of these concepts in spectroscopy.
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I've just begun to study spectroscopy, and I need a clarification about the Doppler Effect.

Consider a cell containing Rubidium and enlight it with a laser. Connect the system with an oscilloscope and give a triangular wave as input (so you can know when the Rubidium is resonant). This is the signal that you see downward in the graph. You can see the output in the upper signal.

2014-02-14-192035_1280x1024_scrot.png

could you explain me how I can see the doppler shift related to the deeper peak and how I can calculate it?

I'm confused because I haven't a course of Spectroscopy and this aspect was treated very very quickly in another course... is the doppler shift the inverse of the FWHM of the peak?
 
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What are you putting the triangular wave put on? Does the rubidium have Piezo properties or something?
 

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