Abstract
This paper demonstrates non-intrusive measurements of sodium argon ion cluster recombinations with electrons, based on coherent microwave scattering (Radar) from REMPI (Resonance Enhanced Multi-Photon Ionization). The sodium number density in the sodium argon mixture was determined by the direct absorption measurement. A tunable laser beam resonantly ionizes the sodium atoms by 2+1 REMPI process in the mixture of sodium and argon at various pressures of 1 Torr to atmospheric pressure and temperatures of 300K to ∼800K. Since the plasma is mainly made of sodium ions in the mixture, the sodium argon ion clusters are thus formed by the Chaperone process. The sodium argon ion cluster recombinations with electrons are inferred from the direct measurement of the total electron number in the laser-induced plasma. At 200°C, nNa = 5.5 × 1010/cm3 and PAr = 100 Torr, the dissociative recombination of Na+·(Ar) is about 1.1 × 10-6cm3/s. The method can be easily extended to other cluster ions, such as Na-(N2) and Na+· (CO2). The results are of fundamental importance for the plasma chemistry and hypersonic research.
Original language | English (US) |
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DOIs | |
State | Published - 2012 |
Event | 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition - Nashville, TN, United States Duration: Jan 9 2012 → Jan 12 2012 |
Other
Other | 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition |
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Country/Territory | United States |
City | Nashville, TN |
Period | 1/9/12 → 1/12/12 |
All Science Journal Classification (ASJC) codes
- Aerospace Engineering
Keywords
- Dissociative recombination
- Radar REMPI
- Sodium argon ion cluster
- Sodium ions