dc.creator Rupper, Patrick en_US dc.creator Merkt, F. en_US dc.date.accessioned 2006-06-15T20:23:46Z dc.date.available 2006-06-15T20:23:46Z dc.date.issued 2002 en_US dc.identifier 2002-RE-06 en_US dc.identifier.uri http://hdl.handle.net/1811/20479 dc.description Author Institution: Physical Chemistry Laboratory en_US dc.description.abstract The $I(1/2u)$, $I(3/2g)$, $I(1/2g)$, $I(3/2u)$ and II(1/2u) states of $Ar^{+}_{2}$ have been investigated in the region between $124650 cm^{-1}$ and $128150 cm^{-1}$ by pulsed-field-ionization zero-kinetic-energy (PFI-ZEKE) photoelectron spectroscopy following $(1 + 1')$ resonance-enhanced two-photon excitation via the $0^{+}_{u}$ Rydberg state located below the $Ar^{\ast} ([3p]^{5}4s'[1/2]_{1}) + Ar (^{1}S_{0})$ dissociation limit of $Ar^{+}_{2}$. By selecting single rotational levels of the intermediate state, the rotational structure of four of the six lowest ionic states of $Ar^{+}_{2}$ could be observed and unambiguous assignments of electronic symmetry of the ionic states could be made on the basis of photoionization selection rules. The rotational structure also provided information on the equilibrium internuclear distances $R^{+}_{e}$ for the $I(1/2u), I(3/2g), I(1/2g)$ and II(1/2u) states $(R^{+}_{e}(I(1/2u)) = (2.393 \pm 0.043) {\AA}, R^{+}_{e} (I(3/2g)) = (2.993 \pm 0.005) {\AA}, R^{+}_{e} (I(1/2g)) = (3.151 \pm 0.002){\AA}$ and $R^{+}_{e} (II(1/2u)) = (3.851 \pm 0.012) {\AA}$). The adiabatic ionization potentials are determined to be $IP(I(3/2g)) = (125685.3 \pm 0.7) cm^{-1}, IP(I(1/2g)) = (126884.1 \pm 0.7) cm^{-1}, IP(I(3/2u)) = (127044.6 \pm 1.5) cm^{-1}$ and $IP(II(1/2u)) = (128000.8 \pm 0.7) cm^{-1}$, from which dissociation energies are obtained as $D^{+}_{0} (I(3/2g)) = (1509.3 \pm 1.2) cm^{-1}, D^{+}_{0}(I(1/2g)) = (310.5 \pm 1.2) cm^{-1}, D^{+}_{0}(I(3/2u)) = (150.0 \pm 1.8) cm^{-1}$ and $D^{+}_{0}(II(1/2u)) = (625.4 \pm 1.2) cm^{-1}$. The interaction between the I(1/2g) and I(3/2g) states could also be observed and analyzed. en_US dc.format.extent 273786 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title ROTATIONALLY RESOLVED PHOTOELECTRON SPECTROSCOPY STUDY OF THE FIRST ELECTRONIC STATES OF $Ar^{+}_{2}$ en_US dc.type article en_US
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