Hyperfine structure and lifetime measurements of the second-excited $D$ states of rubidium and cesium by cascade fluorescence spectroscopy

The hyperfine structure of the second-excited

D

states of

{}^{85}{Rb}

{}^{85}{Rb}

, and

{}^{133}{Cs}

has been measured by the method of cascade-radio-frequency spectroscopy and cascade-level crossing. The sign of the magnetic-dipole coupling constant

A

is determined by the method of cascade-decoupling and cascade-radio-frequency spectroscopy with narrow-band excitation. Lifetimes

τ

of some of these states are measured by the cascade-Hanle effect. We find that for

{}^{87}{Rb}

A (5 {}^{2}D_{\frac{3}{2}}) = 14.43 \pm 0.23

MHz,

A (5 {}^{2}D_{\frac{5}{2}}) = - 7.44 \pm 0.10

MHz,

τ (5 {}^{2}D_{\frac{3}{2}}) = 205 \pm 40

nsec; for

{}^{85}{Rb}

A (5 {}^{2}D_{\frac{3}{2}}) = 4.18 \pm 0.20

MHz,

A (5 {}^{2}D_{\frac{5}{2}}) = - 2.12 \pm 0.20

MHz; for

{}^{133}{Cs}

A (6 {}^{2}D_{\frac{3}{2}}) = 16.30 \pm 0.15

MHz,

A (6 {}^{2}D_{\frac{5}{2}}) = - 3.6 \pm 1.0

MHz,

τ (6 {}^{2}D_{\frac{3}{2}}) = 57 \pm 15

nsec.

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Hyperfine structure and lifetime measurements of the second-excitedDstates of rubidium and cesium by cascade fluorescence spectroscopy