Journal of Modern Optics

Disappearance of Trapped Yb+

Jun Yoda, Kazuhiko Sugiyama

Published Feb 1, 1992• 10 citations

Abstract

The storage time of Yb+ ions trapped in an r.f. trap was determined by the rf resonance absorption method in the presence of buffer gas, without and with laser radiation of a frequency equal to the transition from the S1/2 ground state to the excited P1/2 state. The storage time of the ions with the buffer gas (presure between 1 × 10−4 and 4·2 × 10−4 Pa) was several hours without the laser radiation; this period was shortened to several hundred seconds by irradiation with a 500 nW laser source. This phenomenon shows that the trapped Yb+ ions disappeared from the trap as a result of irradiation with the resonance laser light.

DOI: 10.1080/09500349214550391

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Journal of Modern Optics

Disappearance of Trapped Yb+

Jun Yoda, Kazuhiko Sugiyama

Published Feb 1, 1992• 10 citations

Publisher

Abstract

DOI: 10.1080/09500349214550391

Related papers

Study of Yb/sup +/ trapped in a RF trap with light buffer gas by irradiation with resonant light (frequency standards)

K. Sugiyama, Jun Yoda

IEEE Transactions on Instrumentation and MeasurementApr 1, 19937 citations

Production of YbH+ by chemical reaction of Yb+ in excited states with H2 gas

Kazuhiko Sugiyama, Jun Yoda

It is known that fluorescence of trapped ${\mathrm{Yb}}^{+}$ ions fades with continuous driving of the $^{2}$ ${\mathrm{S}}_{1\mathrm{/}2}$ ${\mathrm{\ensuremath{-}}}^{2}$ ${\mathrm{P}}_{1\mathrm{/}2}$ transition in the presence of buffer gases. This phenomenon has been interpreted as being caused by population trapping in the $^{2}$ ${\mathrm{F}}_{7\mathrm{/}2}$ state of ${\mathrm{Yb}}^{+}$ . As another cause of the fluorescence disappearance, we found the production of ${\mathrm{YbH}}^{+}$ by chemical reaction of ${\mathrm{Yb}}^{+}$ in excited states with ${\mathrm{H}}_{2}$ gas. We found that the wavelengths of 369.482, 369.202, and 368.947 nm, formerly assigned as wavelengths for deexcitation of ${\mathrm{Yb}}^{+}$ in the $^{2}$ ${\mathrm{F}}_{7\mathrm{/}2}$ state to the $^{2}$ ${\mathrm{S}}_{1\mathrm{/}2}$ ground state, are actually photodissociation lines of ${\mathrm{YbH}}^{+}$ . The change of the resonance point of rf resonance absorption signals indicates the production and dissociation of ${\mathrm{YbH}}^{+}$ ions. The production of ${\mathrm{YbH}}^{+}$ may be a problem in establishing frequency standards using buffer-gas-cooled ${\mathrm{Yb}}^{+}$ , owing to difficulty in removing ${\mathrm{H}}_{2}$ gas from vacuum systems.It is known that fluorescence of trapped ${\mathrm{Yb}}^{+}$ ions fades with continuous driving of the $^{2}$ ${\mathrm{S}}_{1\mathrm{/}2}$${\mathrm{\ensuremath{-}}}^{2}$${\mathrm{P}}_{1\mathrm{/}2}$ transition in the presence of buffer gases. This phenomenon has been interpreted as being caused by population trapping in the $^{2}$ ${\mathrm{F}}_{7\mathrm{/}2}$ state of ${\mathrm{Yb}}^{+}$ . As another cause of the fluorescence disappearance, we found the production of ${\mathrm{YbH}}^{+}$ by chemical reaction of ${\mathrm{Yb}}^{+}$ in excited states with ${\mathrm{H}}_{2}$ gas. We found that the wavelengths of 369.482, 369.202, and 368.947 nm, formerly assigned as wavelengths for deexcitation of ${\mathrm{Yb}}^{+}$ in the $^{2}$ ${\mathrm{F}}_{7\mathrm{/}2}$ state to the $^{2}$ ${\mathrm{S}}_{1\mathrm{/}2}$ ground state, are actually photodissociation lines of ${\mathrm{YbH}}^{+}$ . The change of the resonance point of rf resonance absorption signals indicates the production and dissociation of ${\mathrm{YbH}}^{+}$ ions. The production of ${\mathrm{YbH}}^{+}$ may be a problem in establishing frequency standards using buffer-gas-cooled ${\mathrm{Yb}}^{+}$ , owing to difficulty in removing ${\mathrm{H}}_{2}$ gas from vacuum systems.

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David J. Seidel, Lute Maleki

We report on a study to determine the efficiency of various buffer gases in quenching the population trapping states of laser excited ytterbium ions. The ions were confined in an rf/dc hybrid trap, and their /sup 2/S/sub 1/2//spl hArr//sup 2/P/sub 3/2/ transition was excited with 329 nm laser light. Buffer gases used include H/sub 2/, N/sub 2/, CO/sub 2/, Ar, and He at several different pressure regimes. We have identified N/sub 2/ to be highly efficient in quenching the population of the trapping states, and thus be the most suitable buffer gas to use with ytterbium for the development of a trapped ion microwave frequency standard.We report on a study to determine the efficiency of various buffer gases in quenching the population trapping states of laser excited ytterbium ions. The ions were confined in an rf/dc hybrid trap, and their /sup 2/S/sub 1/2//spl hArr//sup 2/P/sub 3/2/ transition was excited with 329 nm laser light. Buffer gases used include H/sub 2/, N/sub 2/, CO/sub 2/, Ar, and He at several different pressure regimes. We have identified N/sub 2/ to be highly efficient in quenching the population of the trapping states, and thus be the most suitable buffer gas to use with ytterbium for the development of a trapped ion microwave frequency standard.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)Nov 19, 20020 citations

It is known that fluorescence of trapped

{\mathrm{Yb}}^{+}

ions fades with continuous driving of the

^{2}

{\mathrm{S}}_{1\mathrm{/}2}

${\mathrm{\ensuremath{-}}}^{2}$

{\mathrm{P}}_{1\mathrm{/}2}

transition in the presence of buffer gases. This phenomenon has been interpreted as being caused by population trapping in the

^{2}

{\mathrm{F}}_{7\mathrm{/}2}

state of

{\mathrm{Yb}}^{+}

. As another cause of the fluorescence disappearance, we found the production of

{\mathrm{YbH}}^{+}

by chemical reaction of

{\mathrm{Yb}}^{+}

in excited states with

{\mathrm{H}}_{2}

gas. We found that the wavelengths of 369.482, 369.202, and 368.947 nm, formerly assigned as wavelengths for deexcitation of

{\mathrm{Yb}}^{+}

in the

^{2}

{\mathrm{F}}_{7\mathrm{/}2}

state to the

^{2}

{\mathrm{S}}_{1\mathrm{/}2}

ground state, are actually photodissociation lines of

{\mathrm{YbH}}^{+}

. The change of the resonance point of rf resonance absorption signals indicates the production and dissociation of

{\mathrm{YbH}}^{+}

ions. The production of

{\mathrm{YbH}}^{+}

may be a problem in establishing frequency standards using buffer-gas-cooled

{\mathrm{Yb}}^{+}

, owing to difficulty in removing

{\mathrm{H}}_{2}

gas from vacuum systems.

^{2}

{\mathit{S}}_{1/2}

${\mathrm{\ensuremath{\leftrightarrows}}}^{2}$

{\mathit{P}}_{3/2}

transition was excited with 329-nm laser light. Buffer gases used include

{\mathrm{H}}_{2}

{\mathrm{N}}_{2}

{\mathrm{CO}}_{2}

, Ar, and He at several different pressure regimes. We have identified

{\mathrm{N}}_{2}

to be highly efficient in quenching the population of the trapping states and thus be the most suitable buffer gas to use with ytterbium for the development of a trapped-ion microwave frequency standard.