Measurement of sodium-argon cluster ion recombination by coherent microwave scattering

摘要

This present work demonstrates a non-intrusive measurement of the rate constant for sodium-argon cluster ions (Na~+·Ar) recombining with electrons. The measurements begin with resonance enhanced multi-photon ionization of the Na followed by coherent microwave scattering (radar) to monitor the plasma density. The Na～+Ar adduct was formed in a three-body reaction. The plasma decay due to recombination reactions was monitored as a function of time and modeled to determine the rate constant. At 473K, the rate constant is 1.8_(-0.5)~(+0.7)×10~(-6)cm~3/s in an argon buffer at 100 Torr and initial Na number density of 5.5 x 10~(10)cm~(-3).