| Issue |
Europhys. Lett.
Volume 56, Number 5, December 2001
|
|
|---|---|---|
| Page(s) | 644 - 650 | |
| Section | Atomic and molecular physics | |
| DOI | https://doi.org/10.1209/epl/i2001-00569-0 | |
| Published online | 01 December 2003 | |
Surface-induced vibrational transition of metastable nitrogen molecules passing through a nano-slit grating
1
Dipartimento di Chimica, Università di Perugia
Via Elce di Sotto, 06123, Perugia, Italy
2
Laboratoire de Physique des Lasers, Université Paris 13
Avenue J.B. Clément, 93430, Villetaneuse, France
3
Institute of Physics, University of Kragujevac - Yugoslavia
Corresponding author: ducloy@lpl.univ-paris13.fr
Received:
30
May
2001
Accepted:
14
September
2001
Metastable nitrogen molecules 
(A
) passing through a 
nano-slit grating (slit width: 50
) experience elastic and
various inelastic processes, due to diagonal and off-diagonal
interactions with the solid surface at short and intermediate
distances (10-
), i.e. mainly interactions
of the van der Waals (vW) type. These processes are observed by
use of a velocity selected beam and a time-of-flight analysis
combined with angular measurements of scattered metastable
molecules. The main feature is the occurrence of an inelastic
exothermal process identified, by both its kinetic energy gain and
angular dependence, as being a vibrational transition with
. A semi-classical model using a calculated (vW)
dispersion energy depending on the orientation of the molecule
and the vibrational coordinate is proposed.
PACS: 34.50.Dy – Interactions of atoms and molecules with surfaces; photon and electron emission; neutralization of ions / 34.50.Ez – Rotational and vibrational energy transfer / 68.49.Df – Molecule scattering from surfaces (energy transfer, resonances, trapping)
© EDP Sciences, 2001
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