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- W2017125812 abstract "Relative photodetachment cross sections for rotational thresholds of the hydroxide anion were measured using a coaxial laser-ion beam spectrometer. The thresholds correspond to transitions from the J=1 and J=2 states of X${mathrm{}}^{1}$${mathrm{ensuremath{Sigma}}}^{+}$ ${mathrm{OH}}^{mathrm{ensuremath{-}}}$ to the J=3/2 state of X${mathrm{}}^{2}$${mathrm{ensuremath{Pi}}}_{3mathrm{/}2}$ OH. Best fits of the data give cross sections that scale with energy above threshold as (E-${mathrm{E}}_{mathrm{th}}$${)}^{0.18ifmmodepmelsetextpmfi{}0.06}$ and (E-${mathrm{E}}_{mathrm{th}}$${)}^{0.21ifmmodepmelsetextpmfi{}0.05}$ for the two thresholds, respectively. This non-Wigner law energy dependence of the cross section results from the long-range ${mathrm{r}}^{mathrm{ensuremath{-}}2}$ interaction between the dipole and the departing electron. Experimental results were compared with the predictions of a strong-coupling model of charge-dipole interaction devised by Engelking and good qualitative agreement was observed. When the resolution and range of the data for transitions that terminate in the lower ensuremath{Lambda}-doublet component is such that the ensuremath{Lambda}-doublet splitting is resolved, one observes the (E-${mathrm{E}}_{mathrm{th}}$${)}^{1mathrm{/}2}$ behavior predicted by the Wigner law. This result is explained in terms of the effect of the ensuremath{Lambda} doubling upon the ${mathrm{r}}^{mathrm{ensuremath{-}}2}$ charge-dipole interaction. From the threshold frequencies, an OH electron affinity of 14 741.02(3) ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ was determined." @default.
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- W2017125812 title "High-resolution threshold photodetachment spectroscopy of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>OH</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>" @default.
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- W2017125812 doi "https://doi.org/10.1103/physreva.55.2036" @default.
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