Journal of Physics Conference Series

Radiative lifetime of metastable Xe3+ measured using an electrostatic ion beam trap

M. Saito, Asahi Chikaoka, T. Majima, Makoto Imai, H. Tsuchida

Published Jul 1, 2017• 0 citations

Abstract

We have measured the radiative lifetime of the 2 P 3/2 metastable level in Xe 3+ using an electrostatic ion beam trap. The lifetime was obtained by measuring the number of photons emitted during the 2 P 3/2 → 2 D 3/2 transition of Xe 3+ as a function of the storage time. The lifetime is compared with previously reported theoretical and experimental values.

DOI: 10.1088/1742-6596/875/3/022048

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Journal of Physics Conference Series

Radiative lifetime of metastable Xe3+ measured using an electrostatic ion beam trap

M. Saito, Asahi Chikaoka, T. Majima, Makoto Imai, H. Tsuchida

Published Jul 1, 2017• 0 citations

Publisher

Abstract

DOI: 10.1088/1742-6596/875/3/022048

Related papers

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The radiative lifetime of the

{}^{1}{S}_{0}

metastable state of

{\mathrm{Xe}}^{2+}

has been measured with a different type of electrostatic ion trap. The ion trap stores ion beams of a few keV using purely electrostatic fields and provides a large field-free region where the stored ions oscillate. A photomultiplier working in the single-photon counting mode was used to observe the 380 nm photons arising from the magnetic dipole

(M1)

transition ${}^{1}{\stackrel{\ensuremath{\rightarrow}}{{S}_{0}}}^{3}{P}_{1}$ of

{\mathrm{Xe}}^{2+}.

The present measurement yields a value of $4.46\ifmmode\pm\else\textpm\fi{}0.08 \mathrm{ms},$ which is in good agreement with previous measurements, but is almost four times more accurate.

The lifetimes of the metastable

1s2s2p{ }^{4}{P}_{5/2}

level of ${\mathrm{He}}^{\ensuremath{-}},$ as well as the lifetime of the average of the

{}^{4}{P}_{3/2}

and

{}^{4}{P}_{1/2}

levels, have been measured using a new type of ion trap that stores keV ion beams using electrostatic fields only. The use of a pure electrostatic field avoids the complication of magnetic-field-induced mixing effects, which can interfere with the measurement of the spontaneous decay. The measured lifetime for the

{}^{4}{P}_{5/2}

state, after correction for decay induced by blackbody radiation, is $343\ifmmode\pm\else\textpm\fi{}10 \ensuremath{\mu}\mathrm{s}.$ This value is consistent with previous experiments, and in excellent agreement with the most recent theoretical calculations. The average lifetime of the

{}^{4}{P}_{3/2}

and

{}^{4}{P}_{1/2}

is $8.9\ifmmode\pm\else\textpm\fi{}0.2 \ensuremath{\mu}\mathrm{s},$ which is about 20% lower than the weighted theoretical value.

The radiative lifetime of

1s2s^{3}S_{1}

{\mathrm{Li}}^{+}

ions has been measured by a comparison of the count rate of spontaneous decay photons (210 \AA{}) to a laser-induced fluorescence signal proportional to the total number of metastable ions. The ions were confined in a rf-quadrupole trap, and the fluorescence signal used was the intercombination transition

1s2p^{3}P_{1}

to $1{s}^{2}^{1}S_{0}$ at 202 \AA{}. The

^{3}P_{1}

state was populated from

^{3}S_{1}

by absorption of laser photons at 5485 \AA{}. The result is ${\ensuremath{\tau}}_{r}=58.6\ifmmode\pm\else\textpm\fi{}12.9$ sec (95% confidence level); theory predicts ${\ensuremath{\tau}}_{r}=49.1$ sec.

The radiative lifetime of Li II

2^{1}S_{0}

has been measured by counting decay photons versus time from an ensemble of metastable Li ions stored in a simple electromagnetic trap of the Penning variety. The result is ${\ensuremath{\tau}}_{\mathrm{expt}}=503(26)$ \ensuremath{\mu}sec. The error represents one standard deviation from the mean of a series of 34 separate determinations. This result is in agreement with the theoretical value ${\ensuremath{\tau}}_{\mathrm{th}}=513$ \ensuremath{\mu}sec.