Natural Radiative Lifetimes and Stark-Shift Parameters in the 4 p 2 Configuration in Ca I
1984; IOP Publishing; Volume: 30; Issue: 1 Linguagem: Inglês
10.1088/0031-8949/30/1/013
ISSN1402-4896
AutoresG. Jönsson, C. Levinson, Sune Svanberg,
Tópico(s)Mass Spectrometry Techniques and Applications
ResumoThe radiative lifetimes in the doubly excited 4p2 configuration in Ca were determined using the delayed coincidence technique. The measured states were populated either with two-step laser excitation from the 4s2 1S0 ground state or with single-step excitation starting from a metastable state. The metastable states were populated by collisions in a discharge. The following lifetime values were obtained: τ(4p2 1D2) = 16.3(20) ns, τ(4p2 1S0) = 14.4(7) ns and τ(4p2 3P0,1,2) = 6.9(4) ns. Stark shift parameters in the same configuration were measured using an atomic beam passing between electric field plates. The following results were obtained: α0(4p2 1S0) = -32.2(16) MHz (cm/kV)2, α0(4p2 1D2) = 1.8(2) MHz (cm/kV)2 and α2(4p2 1D2) = 1.15(10) MHz (cm/kV)2. Additional measurements yielded τ(4s5f1F3) = 60(3) ns, τ(4s4d3D1,2,3) = 13.0(5) ns and α0 (4s6s1S0) = 6.98(35) MHz (cm/kV)2.
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