Experimental 2CH excitation in acetylene-containing van der Waals complexes

摘要

Spectroscopic results are presented concerning the 2CH excitation around 1.5mm in van der Waals complexes of acetylene (C_2H_2) with Ar, Kr, N_2,CO_2,N_2O and C_2H_2. Many are reviewed from the literature, with some updates. Previously unpublished results are also presented, concerning the mechanism of formation of C_2H_2–Ar in the supersonic jet, the assignment of new spectral structures in C2H2–N2O, and the first observation of 2CH excitation in C_2H_2–Ne, C_2H_2–H_2O, C_2H_2–D_2O and (C_2H_2)_n. Lifetimes of these 2CH vibrationally excited dimers are discussed.