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NEWS

Klaus Müller-Dethlefs

The Photon Science Institute and School of Chemistry, University of Manchester

Friday, May 6th, 2016 at 11:00:00 AM  

Aula Querzoli - LENS

Published on-line at 11:26:07 AM on Tuesday, May 3rd, 2016

Observation of surface solitons in a quantum degenerate plasma

A long life-time (>0.3 ms) quantum degenerate molecular Rydberg plasma is generated in the high-density region of a pulsed supersonic jet expansion by two-colou

A long life-time (>0.3 ms) quantum degenerate molecular Rydberg plasma is generated in the high-density region of a pulsed supersonic jet expansion by two-colour resonant excitation of nitric oxide (10%) in neon (5bar) into the high-n Rydberg threshold region close to the ionization limit.

For the plasma densities of < 1016 cm–3 reached in our experiments the electrons should become quantum degeneratei.e. the electron de Broglie wavelength becomes larger than the Wigner-Seitz radius a relevant to describe the mean distance between the particles. Considering the well-known properties of pulsed supersonic jet expansions and textbook plasma physics, the Fermi energy EF = (3p2)2/3ne2/3h2/8p2me becomes bigger than the thermal energy kT .

Descrizione:NO_Figure1_20April11.eps

Experimentally, two high-voltage pulses of 3.6 kV with a 200ns gap are applied to aperture 1. When the plasma cloud approaches the metal plate (1), which has an aperture, NOtime-of-flight (TOF) spectra are recorded as shown in the figure.

 

These sharp resonances in the TOF spectrum can be interpreted as solitons (= ”standing waves”) of counter-propagating surface plasmons, which are excited by the combination of pulsed fields.

For further informations, please contact Maurizio Becucci.