| Issue |
Europhys. Lett.
Volume 68, Number 3, November 2004
|
|
|---|---|---|
| Page(s) | 377 - 383 | |
| Section | Atomic and molecular physics | |
| DOI | https://doi.org/10.1209/epl/i2004-10225-3 | |
| Published online | 09 October 2004 | |
Low-energy positron scattering: Modelling
the formation of bound ![$\mth{[M\mbox{-}e^+]}$](/articles/epl/abs/2004/21/epl8438/epl8438_tex_eq1.png)
states
in deformed polyatomic molecules
Dipartimento di Chimica, Università di Roma “La Sapienza” and INFM Piazzale A. Moro 5, 00185 Roma, Italy
Corresponding author: fa.gianturco@caspur.it
Received:
12
May
2004
Accepted:
10
September
2004
Quantum calculations are carried out to evaluate the scattering
length A0 for low-energy positron collisions with gaseous
acetylene molecules which are being “distorted” in their
vibrational mode during the scattering. As the molecular
structure undergoes increasingly larger distortions of that
bending mode, the clear signature of a metastable state (change
of sign for A0) appears at bending deformation of about
from the linear geometry. The effects of such state
on the size of the annihilation parameters of the title molecule
are evaluated and the implications for larger polyatomics are
discussed.
PACS: 34.85.+x – Positron scattering / 36.10.Dr – Positronium, muonium, muonic atoms and molecules / 34.50.Ez – Rotational and vibrational energy transfer
© EDP Sciences, 2004
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