Vibrational-level-dependent yields of O-2(b(1)Sigma(+)(g),upsilon=0) following collisional removal of O-2(A(3)Sigma(+)(u),upsilon)

摘要

The vibrational level dependence of the branching ratio for the production of O-2(b(1) Sigma(g)(+), v = 0) from the collisional deactivation of O-2(A(3) Sigma(u)(+)) with ground-state O-2 is studied. Using the ultraviolet output from a frequency-doubled tunable dye laser, we excite O-2 molecules to a specific vibrational level (5 less than or equal to v less than or equal to 9) in the A(3) Sigma(u)(+) State and monitor the b(1) Sigma(g)(+)-X-3 Sigma(g)(-) fluorescence near 762 nm. The relative signals following excitation to different vibrational levels are compared to the signals following v = 8 excitation. The branching ratio for b(1) Sigma(g)(+) state production following O-2 collisions is approximately constant for v = 5-8, and decreases by similar to 30% for v = 9. This decrease in the production of the b(1) Sigma(g)(+) state is attributed to the opening of a reactive channel to produce O atoms and ozone. (C) 1998 Elsevier Science B.V. [References: 27]