Source for atomic beams of metastable gases: Design and performance

DeKieviet, Maarten; Dürr, M.; Epp, Sascha W.; Lang, Franziska; Theis, M.

doi:10.1063/1.1638869

Cited by 9 publications

(5 citation statements)

References 7 publications

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“…The different methods for the production of beams of metastable rare-gas atoms have been reviewed by Gay [133] (see also [134][135][136] relatively fast by Coulomb interaction, it is difficult to observe them in fluorescence spectra (as possible for the bound states below the first ionization threshold).…”

Section: Photoexcitation From Metastable Levels a Large Variety Of Bmentioning

confidence: 99%

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Photoionization dynamics of excited Ne, Ar, Kr and Xe atoms near threshold

Sukhorukov¹,

Petrov²,

Schäfer³

et al. 2012

J. Phys. B: At. Mol. Opt. Phys.

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A review of experimental and theoretical studies of the threshold photoionization of the heavier rare-gas atoms is presented, with particular emphasis on the autoionization resonances in the spectral region between the lowest two ionization thresholds (mp 5 2 P 3/2 and mp 5 2 P 1/2 , with m = 2, 3, 4, and 5 for Ne, Ar, Kr, and Xe, respectively). Observed trends in the positions, widths, and shapes of the autoionization resonances in dependence of the atomic number, the principal quantum number n, the orbital angular momentum quantum number and further quantum numbers such as K, J and F specifying the fine-and hyperfine-structure levels, are summarized and discussed in the light of ab initio and multichannel quantum defect theory calculations. The dependence of the photoionization spectra on the initially prepared neutral state, e.g. the 1 S 0 ground state, the mp 5 (m + 1)s 3 P 2 and mp 5 (m + 1)s 3 P 0 metastable levels and other states prepared from the ground or metastable levels in single-and multiphoton processes, are also discussed, including results on the photoionization of aligned and oriented samples and on photoelectron angular distributions. The effects of various approximations in the theoretical treatment of photoionization in these systems are analysed. The very large and at first sight discouraging diversity of observed phenomena and the numerous anomalies in spectral structures associated with the threshold ionization of the rare-gas atoms can be described in terms of a limited set of interactions and dynamical processes. Examples are provided illustrating characteristic aspects of the photoionization, and sets of recommended parameters describing the energy-level structure and photoionization dynamics of the rare-gas atoms are presented which were extracted in a critical analysis of the very large body of experimental and theoretical data available on these systems in the literature.

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Section: Photoexcitation From Metastable Levels a Large Variety Of Bmentioning

confidence: 99%

“…The different methods for the production of beams of metastable rare-gas atoms have been reviewed by Gay [132] (see also [133][134][135] for more recent works). These methods include the extraction of thermal beams from differentially pumped dc or microwave discharges.…”

Section: Photoexcitation From Metastable Levelsmentioning

confidence: 99%

Photoionization dynamics of excited Ne, Ar, Kr and Xe atoms near threshold

Sukhorukov¹,

Petrov²,

Schäfer³

et al. 2012

J. Phys. B: At. Mol. Opt. Phys.

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“…Typically 3 He is utilized because large 3 He polarizations (of order 50%) can be produced. Several techniques exist to hyperpolarize the noble gas nuclei such as metastable exchange optical pumping [7] and atomic beam sources [8]. In this work an optically pumped alkali-metal vapor polarizes the noble gas nuclei via spin-exchange optical pumping (SEOP) [9].…”

Section: Introductionmentioning

confidence: 99%

Measurement of spin-exchange and relaxation parameters for polarizingNe21with K and Rb

Ghosh

Romalis

2010

Phys. Rev. A

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Hyperpolarized K-3 He comagnetometers have been used for tests of fundamental physics and inertial rotation sensing. These experiments will demonstrate increased sensitivity if the 3 He buffer gas is replaced with 21 Ne. We measure the parameters necessary to realize implementation of an alkali-metal-21 Ne comagnetometer for two promising alkali-metal species, Rb and K. The spin-exchange rate constant for K with 21 Ne and Rb with 21 Ne are measured using two different methods. We also make the first measurement of the K-21 Ne contact spin interaction. Measurements for the Rb-21 Ne contact spin interaction, as well as the spin-destruction coefficients for 21 Ne with both alkali-metal species are consistent with previous measurements. Additionally the quadrupolar spin-relaxation rate of 21 Ne is measured. Finally, the feasibility of utilizing polarized 21 Ne for operation in a comagnetometer is discussed.

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“…In the early stages of this work, features from multiple published metastable source designs 22,28,29,37,38,40,[44][45][46][47] were explored to identify a design having high metastable flux, stability sufficient for field experiments (minimum of 12 hours of continuous data acquisition), and repeatable performance. Factors that were varied included: cathode shape, electrode geometry, cathode material, and nozzle material.…”

Section: Resultsmentioning

confidence: 99%

Thermal desorption metastable atom bombardment ionization aerosol mass spectrometer

Robinson

Kimmel

David

et al. 2011

International Journal of Mass Spectrometry

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Designs 1-4 and their achieved metastable fluxes CHAPTER I THESIS INTRODUCTION This thesis is comprised of 4 chapters. The first, this Thesis Introduction will explain how the thesis is structured and where information is included within the thesis. Chapter II is a paper submitted to Analytical Chemistry. The paper explains the optimization of the metastable source which was deemed the most successful design. It also discusses part of the first field campaign, FLAME-3, that the Metastable Atom Bombardment Aerosol Mass Spectrometer (MAB-AMS) was implemented in. Chapter III discussed the design and testing of four source designs. It also lays out a procedure for source operation and maintenance. Chapter IV discusses the future research that could follow on the results presented here.

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Source for atomic beams of metastable gases: Design and performance

Cited by 9 publications

References 7 publications

Photoionization dynamics of excited Ne, Ar, Kr and Xe atoms near threshold

Photoionization dynamics of excited Ne, Ar, Kr and Xe atoms near threshold

Measurement of spin-exchange and relaxation parameters for polarizingNe21with K and Rb

Thermal desorption metastable atom bombardment ionization aerosol mass spectrometer

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