Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry.

摘要: RATIONALE Theoretical calculations have shown that the first ionization energy of clusters type Li(n) Cl (n ≥2), with more than eight valent electrons, is lower alkali metal atoms; hence they are named superalkali. Superalkali can mimic chemical behavior metals and may be used as building blocks new cluster-assembled materials. There currently no reliable experimental proof this kind such required. METHODS The (n = 2-6) were produced by a thermal source modified design, mass selected magnetic-sector spectrometer. modification pertains to replacement side filaments cylinder in triple-filament source. sample, which LiCl salt, was pressed into ring placed on inner wall cylinder. RESULTS It observed ions an even number lithium atoms (Li(2) Cl(+) , Li(4) Li(6) ) stable odd-numbered ones (Li(5) Li(3) ). energies determined 3.98 ± 0.25 eV for Li(2) Cl, 4.10 ± 0.25 eV 3.90 ± 0.25 eV 4.01 ± 0.25 eV Li(5) 4.09 ± 0.25 eV Cl. presence halogen atom reduces clusters. CONCLUSIONS design presents suitable simple way obtaining measuring very small monochloride Clusters n = 4 6, detected time.