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• W2074547100 endingPage "1112" @default.
• W2074547100 startingPage "1099" @default.
• W2074547100 abstract "The authors have performed an extensive series of measurements of the infrared rotation-vibration spectrum of the negative molecular ion $^{14}mathrm{NH}^{mathrm{ensuremath{-}}}$. A total of 114 transitions in the P, Q, and R branches of the fundamental band near 3000 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ have been measured with an accuracy (1 standard deviation) of 0.01 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$. The resolution is much higher (7 MHz), enabling us to resolve hyperfine structure. Autodetachment linewidths have also been measured. The electron affinity of NH has been measured with a precision a thousand times higher than previous work: ${E}_{mathrm{EA}}$(NH)=0.374 362ifmmodepmelsetextpmfi{}0.000 005 eV. Our data agree with earlier measurements of the R branch and include the first high-resolution measurements of the Q and P branches. We have observed rotationally excited metastable states as much as 1.8 eV above the autodetachment threshold. A least-squares fit to the transition frequencies has been performed, using an effective Hamiltonian with a sextic term. The predictions of the best previous work, extrapolated to high J, disagree by as much as 10 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, or one thousand times the experimental uncertainty. This paper more than doubles the number of measured transition frequencies in this species." @default.
• W2074547100 created "2016-06-24" @default.
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• W2074547100 date "1987-02-01" @default.
• W2074547100 modified "2023-10-18" @default.
• W2074547100 title "High-resolution measurement of the infrared rotation-vibration spectrum of the negative molecular ion<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>NH</mml:mi></mml:mrow><mml:mrow /><mml:mrow><mml:mi mathvariant=normal>−</mml:mi></mml:mrow><mml:mrow /><mml:mrow /><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>14</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>" @default.
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• W2074547100 doi "https://doi.org/10.1103/physreva.35.1099" @default.
• W2074547100 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9898248" @default.
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