Visible chemiluminescence in the 4300ndash;6600 Aring; region was observed from the Ca+N2O and Ca+O3reactions in argon matrix. The broad bands at 6066 and 6246 Aring; were ascribed to thedthinsp;3Dgr; (orDthinsp;1Dgr;)rarr;athinsp;3Pgr; and theDthinsp;1Dgr;rarr;Arsquo;thinsp;1Pgr; transitions of CaO, respectively. A weaker band at 6416 Aring; (15thinsp;586 cmminus;1) was assigned as emission from the previously unobservedcthinsp;3Sgr;+state to theathinsp;3Pgr; state of CaO. Emission due to Ca atoms in the1P(4s4p)rarr;1S(4s2) and the3P(4s4p)rarr;1S(4s2) transitions was also observed as sharp peaks at 4231 and 6575 Aring;, respectively. The atomic emitters were excited by energy transfer from CaOast;, most probably from theD,d, andcstates. The Ca(3P) also receives population via fast relaxation from the1Pstate.
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