Abstract
Abstract Chemiluminescent reactions of magnesium, calcium, and strontium atoms with I 2 were studied in a beam-gas configuration. For ground state atoms, unstructured chemiluminescence typical for alkaline earth dihalides MX 2 was observed for Ca and Sr, but not for Mg. The emission extends from γ = 400 nm to γ > 950 nm. The pressure dependence of the chemiluminescence indicates that the MI 2 ∗ molecules are formed mainly via vibrationally excited alkaline earth monohalide. Partial excitation of the atomic beams to the metastable 3 P states brings as dominant emission a similar continuum-like spectrum for Mg ∗ (the emitter is formed in a single collision), while for Ca ∗ and Sr ∗ the MI 2 ∗ spectrum is suppressed by the chemiluminescence of alkaline earth monoiodides. A lower limit of chemiluminescence cross section for Mg ∗ ( 3 P )+ I 2 is (4.2±0.9) × 10 −20 m 2 (corresponding to photon yield ⩾4.2% ± 0.9%), whereas for the other two reactive systems it is of the order of 10 −21 m 2 (photon yield 2~0.1%).
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