Low Temperature Physics: 29, 848 (2003); https://doi.org/10.1063/1.1619356 (4 pages)
Физика Низких Температур: Том 29, Выпуск 9-10 (Сентябрь 2003), c. 1113-1117 ( к оглавлению , назад )
Luminescence and formation of alkalihalide ionic excimers in solid Ne and Ar
G. Śliwiński and M. Frankowski
Polish Academy of Sciences, IF-FM, Fiszera 14, PL 80-952 Gdansk, Poland
Institute of Experimental Physics, Free University, Arnimallee 14, Berlin D-14195, Germany
Transitions from ionic states A2+X– of alkalihalides CsF, CsCl and RbF isolated in solid Ne and Ar films recorded under pulsed e-beam excitation are studied. The B(2∑1/2)-X(2∑1/2) and C(2П3/2)-A(2П3/2) luminescence bands of Cs2+F– (196.5 nm, 227 nm), Cs2+Cl– (220.1 nm, 249.2 nm) and Rb2+F– (136 nm) in Ne, and a weakerB–X emission of Cs2+F– (211.2 nm) in Ar are identified.
For CsF the depopulation of the A2+X– state is dominated by the radiative decay. A ratio of the recorded exciplex emission intensities of I(CsF)/I(CsCl)/I(RbF) = 20/5/1 reflects the luminescence efficiency and for RbF and CsCl a competitive emission channel due to predissociation in the A2+X-(B2∑1/2) state is observed. For these molecules an efficient formation of the state X*2 is
confirmed through recording the molecular D`(3П2g)-A`(3П2u) transition. A strong dependence of the luminescence intensities on the alkalihalide content reveals quenching at concentrations higher than 0.7%.