F -state quenching with CH 4 for buffer-gas cooled 171 Y b + frequency standard [Methane (CH4) for quenching the F-state in trapped Yb+ ions].

Jau, Y. -Y.; Hunker, J. D.; Schwindt, P. D.  D.

doi:10.1063/1.4935562

F -state quenching with CH ₄ for buffer-gas cooled ¹⁷¹ Y b ⁺ frequency standard [Methane (CH4) for quenching the F-state in trapped Yb+ ions].

Journal Article · Sun Nov 01 00:00:00 EDT 2015 · AIP Advances

DOI:https://doi.org/10.1063/1.4935562· OSTI ID:1339264

Jau, Y. -Y. ^[1]; Hunker, J. D. ^[1]; Schwindt, P. D. D. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

We report that methane, CH₄, can be used as an efficient F-state quenching gas for trapped ytterbium ions. The quenching rate coefficient is measured to be (2.8 ± 0.3) × 10⁶ s^-1 Torr^-1. For applications that use microwave hyperfine transitions of the ground-state ¹⁷¹Y b ions, the CH4 induced frequency shift coefficient and the decoherence rate coefficient are measured as δν/ν = (-3.6 ± 0.1) × 10^-6 Torr^-1 and 1/T2 = (1.5 ± 0.2) × 10⁵ s^-1 Torr^-1. In our buffer-gas cooled 171Y b+ microwave clock system, we find that only ≤10^-8 Torr of CH₄ is required under normal operating conditions to efficiently clear the F-state and maintain ≥85% of trapped ions in the ground state with insignificant pressure shift and collisional decoherence of the clock resonance.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: DARPA; USDOE

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1339264

Alternate ID(s):: OSTI ID: 22492194

Report Number(s):: SAND--2015-5204J; 594436

Journal Information:: AIP Advances, Journal Name: AIP Advances Journal Issue: 11 Vol. 5; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Laser-cooled ytterbium-ion microwave frequency standard Mulholland, S.; Klein, H. A.; Barwood, G. P. Applied Physics B, Vol. 125, Issue 11 https://doi.org/10.1007/s00340-019-7309-6	journal	October 2019
A highly miniaturized vacuum package for a trapped ion atomic clock Schwindt, Peter D. D.; Jau, Yuan-Yu; Partner, Heather Review of Scientific Instruments, Vol. 87, Issue 5 https://doi.org/10.1063/1.4948739	journal	May 2016

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Clocks
Ground states
Hyperfine structure
Methane
Microwaves