- Microwave spectrum of the MnO radical in the X 6Σ+ state
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The microwave spectrum of MnO in the 6Σ+ ground electronic state was detected using a source-modulated submillimeter-wave spectrometer. The MnO radical was efficiently generated by dc sputtering of manganese flakes placed inside a hollow cathode in the presence of an oxygen and helium mixture. In total, 283 spectral lines were measured in the frequency region of 210-450 GHz for nine rotational transitions, each of which showed six fine structure line groups consisting of several hyperfine structure components due to the 55Mn nucleus (I=5/2). A least-squares analysis of the measured line frequencies resulted in the determination of rotational, fine, and hyperfine coupling constants including higher-order spin-orbit distortion terms for the spin-spin, spin-rotation interactions and the Fermi contact interaction of the Mn nucleus. The hyperfine coupling constants were used to assess plausible molecular orbital bonding models.
- Namiki, Kei-Ichi,Saito, Shuji
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- A new hypermetallic molecule LaOMn generated by laser ablation
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A new hypermetallic oxide LaOMn and its positive ion involving two heterometal atoms were observed and identified in the 532 nm laser ablation of a La0.67Ca0.33MnO3 target using both time-resolved quadrupole mass spectrometric and time-of-flight mass spectrometric techniques. The dependence of LaOMn+ yield on the laser fluence also confirmed the formation of the ionic hypermetallic species. Theoretical calculations were carried out to predict the stability and the geometric structures of these new molecules. The calculations suggest that the LaOMn and LaOMn+ molecules might be formed via secondary reactions of the neutral and ionic MnO with La or La+ in the laser ablated plasma.
- Wang, Xue-Feng,Dang, Hai-Jun,Gu, Zhen-Ning,Qin, Qi-Zong
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p. 739 - 744
(2008/10/08)
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