Physical Review A

Direct measurements of Ba+ excited-state lifetimes

Mark D. Havey, L. C. Balling, J. J. Wright

Published Jun 1, 1977• 3 citations

Abstract

The lifetimes of the $7s^{2}S_{\frac{1}{2}}$, $6d^{2}D_{\frac{5}{2}}$, and $6d^{2}D_{\frac{3}{2}}$ states of singly ionized Ba have been measured. The lifetime of each state was determined by direct observation of the decay of the fluorescence emitted from the excited state, following selective excitation by two-step, dye-laser excitation. The values obtained for the lifetimes were $\ensuremath{\tau}(7s^{2}S_{\frac{1}{2}})=7.91\ifmmode\pm\else\textpm\fi{}0.56$ nsec, $\ensuremath{\tau}(6d^{2}D_{\frac{5}{2}})=5.56\ifmmode\pm\else\textpm\fi{}0.34$ nsec, and $\ensuremath{\tau}(6d^{2}D_{\frac{3}{2}})=4.99\ifmmode\pm\else\textpm\fi{}0.33$ nsec.

DOI: 10.1103/physreva.15.2332

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Physical Review A

Direct measurements of Ba+ excited-state lifetimes

Mark D. Havey, L. C. Balling, J. J. Wright

Published Jun 1, 1977• 3 citations

Publisher

Abstract

The lifetimes of the

7s^{2}S_{\frac{1}{2}}

6d^{2}D_{\frac{5}{2}}

, and

6d^{2}D_{\frac{3}{2}}

states of singly ionized Ba have been measured. The lifetime of each state was determined by direct observation of the decay of the fluorescence emitted from the excited state, following selective excitation by two-step, dye-laser excitation. The values obtained for the lifetimes were

\ensuremath{\tau}(7s^{2}S_{\frac{1}{2}})=7.91\ifmmode\pm\else\textpm\fi{}0.56

nsec,

\ensuremath{\tau}(6d^{2}D_{\frac{5}{2}})=5.56\ifmmode\pm\else\textpm\fi{}0.34

nsec, and

\ensuremath{\tau}(6d^{2}D_{\frac{3}{2}})=4.99\ifmmode\pm\else\textpm\fi{}0.33

nsec.

DOI: 10.1103/physreva.15.2332

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The lifetimes of the

7s^{2}S_{\frac{1}{2}}

6d^{2}D_{\frac{5}{2}}

, and

6d^{2}D_{\frac{3}{2}}

\ensuremath{\tau}(7s^{2}S_{\frac{1}{2}})=7.91\ifmmode\pm\else\textpm\fi{}0.56

nsec,

\ensuremath{\tau}(6d^{2}D_{\frac{5}{2}})=5.56\ifmmode\pm\else\textpm\fi{}0.34

nsec, and

\ensuremath{\tau}(6d^{2}D_{\frac{3}{2}})=4.99\ifmmode\pm\else\textpm\fi{}0.33

nsec.

The lifetime of the

^{3}P_{1}

state of Sr has been measured by observing the intensity of the $5{s}^{2}^{1}S_{0}\ensuremath{\leftrightarrow}5s5p^{3}P_{1}$ fluorescence as a function of time, following the excitation of the

^{3}P_{1}

state by a 1-\ensuremath{\mu}sec pulse from a flashlamppumped dye laser. The measured value of the

^{3}P_{1}

lifetime is 21 \ifmmode\pm\else\textpm\fi{} 1 \ensuremath{\mu}sec.

We report measurements of the fluorescence lifetimes of positronium (Ps) atoms with principal quantum numbers

n=10--19

. Ps atoms in Rydberg-Stark states were produced via a two-color two-step $1\phantom{\rule{0.16em}{0ex}}^{3}S\ensuremath{\rightarrow}2\phantom{\rule{0.16em}{0ex}}^{3}P\ensuremath{\rightarrow}n\phantom{\rule{0.16em}{0ex}}^{3}S/n\phantom{\rule{0.16em}{0ex}}^{3}D$ excitation scheme and subsequently detected after traveling 1.2 m. The measured time-of-flight distributions were used to determine the mean lifetimes of the Rydberg levels, yielding values ranging from $3\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}\mathrm{s}$ to $26\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}\mathrm{s}$. Our data are in accord with the expected radiative lifetimes of Rydberg-Stark states of Ps.

Measurement of the lifetimes of the

7p \: ^2P_{3/2}

and

7p \: ^2P_{1/2}

states of atomic cesium

Lifetime measurement of nD

_{\mathrm{3/2}}

and nD

_{\mathrm{5/2}}

Rb Rydberg states.