The variation of the total integral cross section for the chemiluminescent channel with the vibrational excitation 3≤v″≤19 is investigated using laser‐induced fluorescence or coherent population transfer, a new method employing delayed interaction with two cw lasers to populate vibrationally excited levels. The cross section increases with v″ by about 0.76% per vibrational level. The results are in agreement with the results of phase‐space calculations, as well as with those from simple curve crossing models.

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