The Hydrogen Spectrum & Energy Levels
BlackBoard Notes

======================= Photo - Click for a Larger Version =============================

======================= First Board Section =============================

• Measure λ's for visible lines of Hydrogen
• Calculate expected λ's and identify transitions producing the lines observed
• Don't move the spectrometers!

• ---

• (If needed:) Lab Evaluations!
• On front bench
• Fill one in (out?)
• No name required
• Leave pages stapled together

======================= Second Board Section =============================

• Wavelength of each H-line:
  • Measure θ for each line, to 0.1°
  • Calibrate spectrometer by observing yellow line of sodium (λ_Na = 589.3 nm)
  • Set up a ratio for each H-line, and solve for λ_H
  • 

======================= Third Board Section =============================

1. Energy level diagram (Large and Neat!):
   • Drawing note for Jeff:
     • First draw horizontal lines for n = ∞ and n = 1
     • Label n = ∞ as "Ionization Level"
     • Fill in other levels by taking ½ of available space
     • Finish with vertical axis and transitions
     • Equations may run into the Fourth Board Section

    

    

2. Which transitions created the lines you observed?

======================= Fourth Board Section =============================

Spectrometer Alignment Notes: (Note that this section will be tight on space!)

• Move front of spectrometer left and right so zeroth order image is pink, not pink and blue!

  

• Don't push on eyepiece; change angle by pushing on angle pointer
• Rotate eyepiece to align crosshair parallel to spectral line.



• Turn off the H-bulb when finished measuring your angles!

   

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©	St. Lawrence University	Department of Physics

Revised: 25 Apr 23

Canton, NY 13617