Nascent Rotational and Vibrational Product State Distribution in the Charge Transfer Reaction of N+ (+CO) yields (CO+) +N at Near Thermal Energy

摘要

An improved ion beam apparatus is used to measure the nascent product state distribution in the charge transfer reaction N++C0 yields C0++N under single-collision conditions at 0.16 eV energy. At this energy, the major vibrational channel in the C0+ products is v = 1, in contrast to the predominant formation of v = 0 at thermal energy. The relative vibrational distribution for the N++C0 reaction is (0.40 + or - 0.07) v=0:(0.57 + or - 0.04) v=1: (0.03 + or - 0.01)v=2. In the v = 0 channel, the rotational distribution under single-collision conditions can be characterized by a Boltzmann distribution with a temperature of T = 410 + or - 40 K. In the v = 1 channel the rotational distribution is highly excited and non-Boltzmann. The lower rotational states approximate a very high temperature of 2000 K. For high rotational quantum numbers (K > 23), the rotational temperature is about T = 810 + or - 20 K. The dramatic differences in the rotational distributions are clear evidence that these two vibrational channels are formed by different reaction mechanisms, most likely a direct reaction for v = 0, and an intimate collision for v = 1.