Abstract
We observed emission from electronically excited CO+ B 2Σ+(ν=0) after laser excitation of ground-state CO with a picosecond dye laser. The laser frequency was tuned to the CO two-photon transition X 1Σ+(ν″=0)→→B 1Σ+(ν′=0) at 230 nm, resulting in 2+1 resonance-enhanced ionization of CO with production of CO+ X 2Σ+, followed by resonant excitation of the one-photon X 2Σ+(ν+′=1)→B 2Σ+(ν+=0) transition in CO+. We provide direct evidence for this process by detecting CO+ B 2Σ+(ν+=0)→X 2Σ+ emission after the laser excitation. An analysis of the pulse-energy and pressure dependence of the CO+ emission is presented to derive collisional quenching rate coefficients for CO+ B 2Σ+.
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