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MO: Molekülphysik

MO 13: Spektroskopie III

MO 13.3: Talk

Thursday, March 19, 1998, 14:30–14:45, M629

The effect of vibrational and electronic autoionization on the CO⁺ A ²Π vibrational populations — •E.E. Rennie¹, M.A. Hayes², D.M.P. Holland², M.A. MacDonald², D.A. Shaw², and L.G. Shpinkova³ — ¹Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin — ²Daresbury Laboratory, Daresbury, Warrington, Cheshire, England, WA4 4AD — ³Institute of Nuclear Physics, Moscow State University, Moscow, Russia

Vibrationally resolved relative fluorescence cross sections have been measured for the CO⁺ A ²Π→X ²Σ⁺ transition using monochromated synchrotron radiation between 618 and 750 Angstroms. In this wavelength region the photoionization spectrum is dominated by intense autoionizing resonances belonging to the Rydberg series converging onto the various vibrational levels of the CO⁺ A ²Π or the B ⁻²Σ⁺ ionization thresholds. Autoionization from these Rydberg states into the CO⁺ A ²Π state causes significant variations to occur in the A ²Π→X ²Σ⁺ fluorescence cross sections and the CO⁺ A ²Π vibrational branching ratios. The effect of vibrational and electronic autoionization on the CO⁺ A ²Π populations in wavelength regions encompassing resonant photoabsorption transitions will be disscussed.