# THE PHOTOIONIZATION SPECTROSCOPY OF THE ZINC MONOETHYL RADICAL AND ITS POSITIVE ION

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 Title: THE PHOTOIONIZATION SPECTROSCOPY OF THE ZINC MONOETHYL RADICAL AND ITS POSITIVE ION Creators: Pushkarsky, Michael B.; Stakhursky, Vadim; Miller, Terry A. Issue Date: 1999 Publisher: Ohio State University Abstract: The high resolution spectroscopy of many closed-shell ions has for years been relatively inaccessible. However, ZEKE spectroscopy applied to open-shell radicals produced in situ free jets enables one to probe the ground electronic state of the corresponding closed-shell ions. In the recent past we have $investigated^{a,b}$ the $^{1}A_{1}$ ground electronic state of the cations of three Group IIa and IIb organometallic radicals. $MCH_{3}, (M=Mg, Zn, Cd)$. In this talk we will present the spectroscopic study of the zinc monoethyl radical, and its positive ion. $ZnC_{2}H_{5}$ has been produced in situ in a free jet by laser photolysis of $Zn(C_{2}H_{5})_{2}$. The vibrational structure of the $\bar{A}$ electronic state of the zinc monoethyl radical and the $\bar{X}$ state of its cation have been probed by $(1+1^{\prime})$ REMPI and ZEKE, respectively. The REMPI spectrum is nearly identical with the previously $reported^{c}$ LIF spectrum. The zinc monoethyl ionization potential has been found to be $56380(5) cm^{-1}$. The ZEKE study has revealed complex vibrational structure in the ground electronic state of the ion, dominated by progressions involving $\nu_{g}, (\omega_{g} - 201(3) cm^{-1})$, the low frequency in-plane Zn-C-C bending mode. The details of the cation's vibrational assignment will be given. Implications of our observations for the carbon-metal bonding in the metal alkyl radical molecular systems will be discussed. Description: $^{a}$ S.E. Panov, D.E. Powers, and T.A. Miller, J. Phys. Chem., 108, 1335 (1998). $^{b}$ T.A. Barckholtz, D.E. Powers, T.A. Miller, and B.E. Bursten, J. Am. Chem Soc., 121, XXXX (April, 1999). $^{c}$ I.M. Povey, A.J. Bezant, G.K. Corlett, and A.M. Ellis. J. Phys. Chem., 98, 10427 (1994). Author Institution: The Ohio State University, Dept. of Chemistry, Laser Spectroscopy Facility URI: http://hdl.handle.net/1811/19582 Other Identifiers: 1999-WI-03