Energy transfer in the 31,214151 Fermi‐resonant states of acetylene. I. Rotational energy transfer

摘要: An infrared–ultraviolet double resonance technique is used to probe the state‐to‐state rotational energy transfer dynamics of self‐relaxation in acetylene. The output an optical parametric oscillator at ∼3 μm excite C2H2 a level within one its Fermi‐resonant 31,214151 states. By fixing this wavelength and scanning frequency‐doubled tunable dye laser, laser induced fluorescence signals arising from collisional population levels both dyads are observed rate constants for relaxation obtained. Rotational J pumped (upper energy) Fermi‐dyad accounts 74% total loss J=12 level, whereas partner only 16%. A further 7% absolute accounted by vibrational out mixed levels, leaving 3%–4% be for.