Most Likely Position of an Electron

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    Electron Position
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Discussion Overview

The discussion revolves around the most likely position of an electron in a hydrogen atom, particularly in the context of its radial probability density and the implications of using Cartesian coordinates versus spherical coordinates. Participants explore the nuances of probability density, expectation values, and the interpretation of quantum states.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • Some participants argue that the peak of the radial probability density for the 1s state is at the Bohr radius, suggesting that the electron is less likely to be found near the nucleus despite the probability density peaking at zero.
  • Others contend that the probability density does peak at the nucleus, leading to confusion about the electron's most likely position.
  • There is a discussion about the interpretation of "most probable" versus "probable," with analogies made to coin flips to illustrate that the most probable outcome does not imply it is the most likely to occur.
  • Some participants emphasize that the Schrödinger equation separates into radial and angular components, complicating the discussion of the electron's distribution in Cartesian coordinates.
  • Concerns are raised about the interpretation of probabilities in non-commuting variables, with some arguing that constraining the electron's position in Cartesian coordinates is problematic.
  • Participants discuss the limitations of calculating probabilities in Cartesian coordinates and the implications of finding an electron in a specific volume versus a spherical shell.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the interpretation of probability density and the electron's most likely position. There is no consensus on whether the electron is more likely to be found near the nucleus or at the Bohr radius.

Contextual Notes

Limitations include unresolved mathematical interpretations, the dependence on coordinate systems, and the complexities of quantum mechanics that affect the discussion of probability and position.

  • #31
Vanadium 50 said:
My point is that they don't commute with the variables you have already specified. Maybe that was unclear.

And while you can calculate what the probability was, you cant calculate what it is. "The electron is in a 1S state" and "the electron is over here" (or even "not over here") are incompatible.
Sigh. Of course you can, in principle, ask about the position of an electron in the 1S state of a hydrogen atom. Nothing forbids to measure observables of a system only because the system is not in an eigenstate of the measured observable. It's only that due to the preparation in this state the position is indetermined, and you'll find a probability density when repeating the same measurement on many electrons prepared in this 1S state.
 
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