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- W1986629062 abstract "We have measured highly resolved time-of-flight spectra and concomitant angular distributions of slow ${mathrm{Na}}^{+}$ ions produced by near-threshold dissociative ionization of ${mathrm{Na}}_{2}.$ Using double-resonance excitation via the $A{}^{1}{ensuremath{Sigma}}_{u}^{+}$ state, ${mathrm{Na}}_{2}$ molecules are promoted to rotational levels $J=14$ or 16 and vibrational levels between $v=50$ and 69 of the $4{}^{1}{ensuremath{Sigma}}_{g}^{+}$ state. Then, a third photon---from the second of two tunable dye lasers employed---causes the transition into the double continuum associated with the $1{}^{2}{ensuremath{Sigma}}_{u}^{+}$ potential of the ${mathrm{Na}}_{2}^{+}$ cation. A detailed Monte Carlo simulation is employed to study the dynamics of this dissociative ionization process in detail. Based on this approach, we were able to subject recent calculations of this $1{}^{2}{ensuremath{Sigma}}_{u}^{+}$ potential to experimental scrutiny. We find our data to be compatible with a zero-energy crossing near 8.8 AA{} and a well depth of about 70 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, which agrees with most of the published calculations. Angular distributions for the vibrational level $v=60$ are also reproduced well using the same potential parameters and an anisotropy parameter $ensuremath{beta}=2$ modified by a semiclassical argument to account for parent molecule rotation." @default.
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- W1986629062 date "1999-08-01" @default.
- W1986629062 modified "2023-09-26" @default.
- W1986629062 title "Probing the12Σu+cation state by low-energy dissociative ionization ofNa2" @default.
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- W1986629062 doi "https://doi.org/10.1103/physreva.60.1179" @default.
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