Observing the Stark Effect in the Lab: Visible to the Eye?

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    Eye Lab Stark effect
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Discussion Overview

The discussion revolves around the visibility of the Stark effect in laboratory experiments. Participants explore whether the effect can be observed directly with the naked eye or if specialized equipment, such as cameras or spectrometers, is necessary for detection. The conversation includes personal experiences with experimental setups and observations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • Some participants inquire about the visibility of the Stark effect and whether it requires long exposures or specific equipment for observation.
  • One participant mentions that the Stark effect was originally demonstrated by Stark himself and asserts that it is not visible to the naked eye.
  • A participant reports attempting the experiment using a digital camera but did not observe any effect, suggesting that a digital camera may not be sensitive enough to detect the shifts caused by the Stark effect.
  • Another participant emphasizes the need for a spectrometer to observe the effect, questioning the expectations of visibility with a digital camera.
  • A participant clarifies their earlier statement, indicating they used a spectrometer and asks if the spectral splittings can be seen with the naked eye or require a high-exposure camera.
  • Questions arise regarding the specifics of the experimental setup, including the type of sample used, the resolution of the spectrometer, and the expected magnitude of the shifts.
  • One participant recalls a demonstration of the Stark effect at the Deutsches Museum in Munich, suggesting that the effect might be observable without a camera under certain conditions.
  • Another participant expresses a desire to know if anyone has successfully conducted the experiment and shares an image of their apparatus.

Areas of Agreement / Disagreement

Participants express differing views on the visibility of the Stark effect, with some asserting it is not visible to the naked eye while others suggest it may be observable under certain conditions. The discussion remains unresolved regarding the effectiveness of various observational methods.

Contextual Notes

Participants mention various experimental conditions, including the type of discharge tubes used and the strength of the electric fields applied, which may influence the outcomes and observations of the Stark effect.

amalmirando
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has somebody carried out stark effect experiment in the lab?
is the effect visible to the eye or is it necessary to keep long exposures of the CCD to observe the effect?
 
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Yes, to begin with: Stark did it.

No, it's not visible to the eye. But I don't see why you would use a CCD.
 
i tried did the experiment and nothing happened with the field on and off. i used an ordinary digital camera with the maximum exposure but still not a thing happened.
 
amalmirando said:
i tried did the experiment and nothing happened with the field on and off. i used an ordinary digital camera with the maximum exposure but still not a thing happened.

Why would you expect to see anything? I doubt very much a digital camera could distinguish the relatively minuscule shifts caused by the Stark effect. You need to use a spectrometer.
 
please forgive me. all the while i was using the spectrometer and it's the observation part beyond that i was referring to.i guess i mistyped a lot...my question should be corrected as "after getting the spectrum through the spectrometer, would i be able to witness the splittings with the naked eye? or do i need a camera with high exposures?"
 
Guessing at why it did not work without knowing details is complicated.

What is your "sample"? Atoms? Molecules? Heterostructures? What is the resolution of your spectrometer? How large are your fields? Do you have an estimate of how large the shift should be in your case?
 
Cthugha said:
Guessing at why it did not work without knowing details is complicated.

What is your "sample"? Atoms? Molecules? Heterostructures? What is the resolution of your spectrometer? How large are your fields? Do you have an estimate of how large the shift should be in your case?

well ,first i used an ordinary hydrogen discharge tube but it's intensity was very weak .therefore i used a helium discharge tube. the field was provided by a rhumkorff induction coil estimated to yield around 50kv.some papers have reported the shifts in early balmer lines to be around 6 angstroms...
 
If I remember correctly, there is a demonstration experiment of the Stark effect in the "Deutsches Museum" in Munich. The spectrum is displayed on a screen, but I would say that the effect is strong enough to be seen also without a camera.
 
DrDu said:
The spectrum is displayed on a screen, but I would say that the effect is strong enough to be seen also without a camera.

thanks for the tip
 
  • #10
still, is there somebody who has done the experiment?
i have attached an image of my apparatus...
 

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