Spectroscopy: clarification about doppler shift

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SUMMARY

This discussion centers on the Doppler Effect in spectroscopy, specifically in the context of Rubidium when illuminated by a laser. The user seeks clarification on observing and calculating the Doppler shift related to the deeper peak in the output signal when using a triangular wave input with an oscilloscope. Key points include the relationship between the Doppler shift and the Full Width at Half Maximum (FWHM) of the peak, as well as the properties of Rubidium in this experimental setup.

PREREQUISITES
  • Understanding of the Doppler Effect in spectroscopy
  • Familiarity with Rubidium atomic properties
  • Basic knowledge of oscilloscopes and signal analysis
  • Concept of Full Width at Half Maximum (FWHM)
NEXT STEPS
  • Research the mathematical relationship between Doppler shift and peak characteristics in spectroscopy
  • Learn about the properties of Rubidium and its behavior under laser excitation
  • Explore the use of oscilloscopes for analyzing spectroscopic signals
  • Study the implications of triangular wave inputs on resonance in atomic systems
USEFUL FOR

Students and researchers in physics, particularly those focusing on spectroscopy, atomic physics, and signal processing. This discussion is beneficial for anyone looking to deepen their understanding of the Doppler Effect in experimental setups involving Rubidium.

bznm
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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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