Absorbing extremely narrow range of freq

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Discussion Overview

The discussion centers around the concept of frequency absorption in hydrogen atoms and the feasibility of creating an electronic circuit that can absorb a very narrow range of frequencies. The scope includes theoretical considerations of atomic absorption lines and practical implications for electronic circuit design.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant notes that hydrogen atoms only absorb frequencies corresponding to allowed electron transitions, resulting in very thin absorption lines.
  • Another participant references the Q factor, explaining that a high Q factor indicates low damping and a narrow bandwidth, which is necessary for achieving a single absorption line.
  • A subsequent reply affirms the possibility of creating resonators with extremely high Q values, suggesting that such resonators can have much smaller linewidths than atomic levels, which can vary significantly.

Areas of Agreement / Disagreement

Participants generally agree on the need for a high Q factor to achieve narrow frequency absorption, but the discussion includes varying perspectives on the practicalities and implications of this in electronic circuit design.

Contextual Notes

The discussion does not resolve the specific challenges or methodologies for creating such circuits, nor does it clarify the extent to which atomic linewidths can be compared to those of engineered resonators.

granpa
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A hydrogen atom exposed to a continuum of frequencies will only absorb those frequencies that correspond to allowed transitions of the electron. As I understand it, these absorption lines are very thin. Frequencies only slightly off are not absorbed at all.

How difficult would it be to make an electronic circuit with a single absorption line (i.e. that could absorb such a narrow range of frequencies)?
 
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http://en.wikipedia.org/wiki/File:Resonance.PNG
800px-Resonance.PNG
 
http://en.wikipedia.org/wiki/Resonance#Q_factor

The quality factor or Q factor is a dimensionless parameter that describes how damped an oscillator or resonator is,[8] or equivalently, characterizes a resonator's bandwidth relative to its center frequency

so it would need a very high Q factor. In other words, virtually no damping
 
Yes.

It is possible to make resonators with extremely high Q values (billions), meaning their linewidth will be much smaller (and the decay time much longer) than that of many atomic levels (the linewidth it atoms can vary over many orders of magnitude, in some cases the decay times are extremely short leading to very wide spectral widths).
 

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