Jones Beene wrote:
>
> I think that we always "knew" that a minimally bound
> Ps ion would "exist" for some (very fleeting) length
> of time. After all, there is no reason for it not to
> exist for a few picoseconds... but what we really have
> been looking for, ultimately, is validation of a
> longer-lived bound state with *far* more than a
> fractional eV of binding energy - more like several
> tens or even a few hundred keV -
> Ps ion would "exist" for some (very fleeting) length
> of time. After all, there is no reason for it not to
> exist for a few picoseconds... but what we really have
> been looking for, ultimately, is validation of a
> longer-lived bound state with *far* more than a
> fractional eV of binding energy - more like several
> tens or even a few hundred keV -
>
>
Based on the disk or current loop model, the fractional eV value for
many (*e-) triads is counter-intuitive.
The 125 pico-second counter rotation (spin) of a positive-negative positronium pair at near c ("The antiparallel orientation of positron spin and electron spin is called para-positronium, the parallel orientation ortho-positronium.") sets up a strong attractive magnetic force between them.
If in this 125 picosecond window before annihilation, another electron with favorable spin joins
the group the stable triad is most likely formed.
I think the positronium chemistry folks are only seeing the ones that didn't make the grade.
The "current" ( I ) in each loop/disk = q*c/2(pi)r = 2,720 amperes, thus
generating a rather strong ( 1/r^2 or 1/r^4?) magnetic binding force between adjacent loops.
The (calculated) 0.327 eV Ps- anion info cited on pages 6 and 7 of this article is qualified speculation. :-)
Frederick
