This makes uorine a unique atom that in turn has a profound effect when bound to carbon in small. Several molecular constants of F 2 + are also given. Keywords: Fluorine, metabolic stability, binding afnity, positron emission tomography Introduction Fluorine is both small (van der Waals radius 1.47A) and the most highly electronegative element in the Periodic Table (3.98 Pauling scale). These bands are attributed to the A 2Π - X 2Π system of F 2 +, representing the first observation of the optical emission spectrum of this molecule. The rotational analyses of the 12 remaining bands was aided by the computer processing of over 2900 sharp emission lines in the region 4220-5090 Å. The data permit the calculation of several molecular constants and the deduction of other probable characteristics of the states involved but leave some important questions about the F 2 spectrum unanswered. The F 2 spectrum is particularly characterized by extensive perturbations, affecting linewidths, intensities, and level positions. Two bands, however, are assigned to a new system, C 1Σ - B' 1Π. Nine of these bands, together with six unanalyzed bands, are attributed to the emission spectrum of F 2, primarily to the well-known orange system, C 1Σ - B 1Π. Rotational analyses have been carried out for 21 bands in this region. The spectrum was excited by means of a low-frequency, high-voltage discharge in fluorine flowing through a sapphire tube. The emission spectrum of fluorine has been investigated under high resolution in the region 4220-7510 Å.
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