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MULTIPLE PATHWAYS IN THE VIBRATIONAL AUTOIONIZATION OF THE BENDING OVERTONES OF FORMYL RADICAL..

HARTMUT G. HEDDERICH, ERIC J. ZÜCKERMAN AND EDWARD R. GRANT, Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393.

Selected individual rotational levels in vibrational bands of the Renner-Teller split (020) and (030) systems in the 3p\, ² Rydberg state of HCO have served as originating levels for vertical second-photon transitions to vibrationally autoionizing Rydberg series. Spectra of individual rotational levels associated with the (02⁰0) and (02²0) as well as the (03¹0) and (03³0) states of HCO⁺ were obtained. Linewidths of assigned series convey information on autoionization dynamics. Series extrapolations determine anharmonic terms in the HCO⁺ bending potential.