The Photon Science Institute and School of Chemistry, University of Manchester
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 degenerate, i.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 .
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, NO+ time-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.
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