A New Product Channel in the Energy Transfer of CO（ a，v'）+ NO（X）

Under single-collision conditions，a beam of metastable molecules CO（ a，v'）generated by DC discharge was allowed to collide with a beam of NO（X）at a fixed angle of 90o . The collision-induced emission from the interaction region was collected at right angles to the beam plane by a lens set and dispersed by a 1 m monochromator where a cooled photomultiplier tube was mounted on the exit slit. The signal from the PMT was transmitted via a discriminator，a photon counter and a boxcar integrator into a computer for storing and processing. Two broadband emissions were observed around the wavelengths of 780 and 860 nm，which can be assigned to NO（b-a） Ogawa bands Δv = + 4 and + 3 sequences，respectively，and referred to the spectroscopic data given by Huber. At the collision energy of 0. 05 eV in the present experimental conditions，the electronic energy of CO（ a，v' = 0）（6. 01 eV）was not enough to excite NO（X）to NO（b，v' = 4，5）（ΔE > 6. 11 eV）. So，what was in act in the energy transfer was the vibrational excitation of CO（a，v' > 0），and the higher the vibrational excitation of CO（a，v'） was，the stronger the emission intensity of NO（ b-a）could be obtained. It is thought that electron exchange between CO（a）and NO（X）may be operative through the formation of a complex OCNO. The newly discovered formation of NO（ b）channel could be well explained considering the energy conservation，spin conservation and electron exchange mechanism.