Abstract
The rate constant of the NF 3 dissociation reaction in a helium mixture in the low-pressure limit was directly measured in a shock tube by a UV absorption method. The rate constant may be expressed as K = 10 14.38±0.07 exp{−[36600±2100 (cal/mol)]/ RT} cm 3/mol s in the temperature range 1050–1600 K. Levels of the NF 3 stationary dissociation fraction were also measured as a function of the initial temperature of the mixture behind the shock wave. It increases monotonically with temperature and reaches 50% of the value at 1600 K, which corresponds to high NF 2 concentration up to 2×10 17 cm −3.
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