The collisional energy transfer between the D (1)Pi and d (3)Pi states of the NaK dimer induced by argon buffer gas

It is shown in this Comment that the method proposed by Zhiwei et al. to ex tract cross sections for collisional energy transfer between molecular stat es mediated by argon atoms, is neither correct nor suitable, as it fails to reproduce the molecular behaviour they observe. An alternative model based on a consecutive scheme is put forward, and it is shown that a minimal ass umption of one intermediate collisionally activated step is enough to satis factorily reproduce the observations by Zhiwei et al. However, the extracte d parameters are functions of the involved rate constants that are too comp lex to leave any hope of attaining information on the desired cross section s from them by just varying the argon buffer gas pressure, as done by Zhiwe i et al.