Can someone tell me what the HD+ ion is?

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Discussion Overview

The discussion centers around the nature of the HD+ ion, specifically its composition and how it compares to the H2+ ion. Participants explore the definitions and implications of the components involved in the HD+ structure.

Discussion Character

  • Technical explanation, Conceptual clarification

Main Points Raised

  • One participant identifies H2+ as a bound state of an electron and two protons, questioning the nature of HD+ and whether the "D" represents an arbitrary nucleus.
  • Another participant clarifies that "D" stands for deuterium, which is an isotope of hydrogen.
  • A subsequent participant proposes that HD+ consists of a bound state of a proton, a deuteron (one proton and one neutron), and an electron.
  • Another participant agrees, stating that HD+ is analogous to H2+, with one hydrogen atom replaced by deuterium.

Areas of Agreement / Disagreement

Participants generally agree on the composition of the HD+ ion, identifying it as similar to H2+ but with deuterium included. However, there is no explicit consensus on the implications of the "D" designation beyond its identification as deuterium.

Contextual Notes

Some assumptions about the nature of the components and their interactions remain unaddressed, and the discussion does not delve into the implications of these ions in broader contexts.

AxiomOfChoice
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I know [itex]H_2^+[/itex] is a bound state of an electron and two protons, but what's [itex]\text{HD}^+[/itex]? Is the D just a stand-in for an arbitrary nucleus that may, or may not, be a proton?

I found the following website with information about this cation that leads me to believe that the "D" is not just a stand-in, since [itex]\text{HD}^+[/itex] seems to have a well defined molecular weight: http://webbook.nist.gov/cgi/cbook.cgi?ID=C12181167&Units=SI&Mask=1000#Diatomic
 
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D stands for deuterium (hydrogen isotope).
 
Nice; thanks. So [itex]\text{HD}^+[/itex] consists of a bound state of a proton, a deuteron (one proton, one neutron), and an electron?
 
Yes. It is just like H2+ - ionized hydrogen molecule - just with one hydrogen replaced by deuterium.
 

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