Studies on State‐to‐State Energy Transfer of Electronically Excited Atoms and Molecules

Abstract

AbstractRotationally inelastic collisions of NH2( Ã2A1), ∑(0,9,0), 303, 101 have been studied by measuring the dispersed fluorescence spectra at molecular beam conditions. The results show that the angular momentum transfer rule is much more successful than is that predicted by energy gap law for fitting the rotational energy transfer rate. For ΔN < 2 the transfer rates are getting slow down. Downward transfer rates are faster than those of upward transfer. With same angular momentum transferred, the transfer rates for Δka = 0 process are larger than those for Δka≠0. It is also found that rotation transfer process is a very efficient way for decaying of the initially pumped levels. About 60% of the initially pumped 303 is colliding into other rotational levels. Energy transfer reactions of metastable rare gas atoms (Rg*) with N2, NH3, CS2 were investigated by measuring the emission spectra. The preferential population of n(A″) of NH(c1II) was found in He(23S) + NH3 reaction, the experimental data shows II(A″)/II(A′) = 1.2 at J′ < 13. A high vibrational excitation and low rotational excitation of N2(C3n) were observed in Ne(3P02) + N2 reaction comparing with Ar(3P0.2) + N2 reaction. The detailed vibrational populations of CS2+ (Ã, B̃) achieved by He(23S)/Ne(3P0.2) + CS2 reaction are different from those obtained by PES. The vibrational distributions of CH(A2Δ) obtained by He(23S) + CHC13 (CH3NO2) reactions were discussed based on statistical theory, special attention was paid to reveal the role played by tie angular momentum restriction in this process. The result on energy transfer between N2(a1 Π) and CO(X1 ∑) was firstly presented by VUV emission spectra at single collision condition. The mechanisms of energy transfer related to some of the reactions mentioned above were also discussed in the text.