Chemi-luminescence measurements of hyperthermal Xe ~+/Xe ~(2+)+NH ~3 reactions

摘要

Luminescence spectra are recorded for the reactions of Xe ~+ + NH _3 and Xe ~(2+) + NH _3 at energies ranging from 11.5 to 206 eV in the center-of-mass (Ecm) frame. Intense features of the luminescence spectra are attributed to the NH (A 3π _i-X 3∑ ~-), hydrogen Balmer series, and Xe I emission observable for both primary ions. Evidence for charge transfer products is only found through Xe I emission for both primary ions and NH+ emission for Xe ~(2+) primary ions. For both primary ions, the absolute NH (A-X) cross section increases with collision energy before leveling off at a constant value, approximately 9 × 10 ~(-18) cm ~2, at about 50 eV while H-α emission increases linearly with collision energy. The nascent NH (A) populations derived from the spectral analysis are found to be independent of collision energy and have a constant rotational temperature of 4200 K.