On the necessary conditions to form the hydrogen molecule

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Discussion Overview

The discussion centers on the conditions necessary for the formation of the hydrogen molecule (H2) from two hydrogen atoms. Participants explore theoretical aspects, potential mechanisms, and the implications of symmetry in the process, as well as the role of external factors such as a third body or the environment in facilitating this reaction.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants propose that a third body is necessary for the formation of H2 due to energy conservation requirements.
  • Others argue that the energy can be radiated away, suggesting that the reaction could occur without a third body.
  • There is mention of symmetry principles that may prevent the formation of H2 from two hydrogen atoms in isolation, with references to selection rules and quadrupole transitions.
  • Some participants express uncertainty about the details of the mechanisms involved and the implications of the symmetry of the hydrogen atoms.
  • Questions are raised about the source of electrons needed for the covalent bond in H2 and whether a catalyst is required for the reaction.
  • Concerns are voiced regarding the clarity of the original argument and the need for references to support claims made in the discussion.
  • There is a debate about the analogy used to describe atomic interactions, with some participants finding it misleading.
  • Some participants express a desire to understand the topic better, questioning the validity of high-school chemistry teachings regarding hydrogen bonding.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether a third body is necessary for H2 formation or whether the reaction can occur in isolation. Multiple competing views remain regarding the role of symmetry and energy conservation in the process.

Contextual Notes

Limitations include the lack of access to referenced materials, potential language barriers affecting understanding, and unresolved questions about the mechanisms of hydrogen molecule formation.

  • #31
Thank you very much, DrClaude. I also apologize to you for not having organized the text of the question as it should have, with the appropriate references in English.

This phenomenon reminds me of another one, which was studied by Serge Haroche (Nobel Prize winner), namely, the suppression of a given electronic transition in an atom whose electron is in an excited state, when it is placed in front of a mirror, at a given distance.
 
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  • #32
DaTario said:
This phenomenon reminds me of another one, which was studied by Serge Haroche (Nobel Prize winner), namely, the suppression of a given electronic transition in an atom whose electron is in an excited state, when it is placed in front of a mirror, at a given distance.
That is slightly different in that it is due to the electromagnetic field inside the cavity not having a mode corresponding to the energy of the transition in the atom (so it is a property of the field, not the atom). But it all stems from the same physical framework, namely quantum electrodynamics.
 
  • #33
Yes, I understand there are differences, but I 'always' found interesting the metaphorical idea that particles are like 1 and fields are like 0,99999... :smile:

In a certain sense, although they propagate differently, the wave function of the atom and the EM field have some degree of correspondence, haven't they?

OBS.: Perhaps it is not appropriate here to conduct a discussion that departs from the original.
 
  • #34
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