Accurate transition rates for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>5</mml:mn><mml:mi>p</mml:mi><mml:mo>−</mml:mo><mml:mn>5</mml:mn><mml:mi>s</mml:mi></mml:math>transitions in Kr I

Dzierżęga, Krzysztof; Volz, U; Nave, Gillian; Griesmann, Ulf

doi:10.1103/physreva.62.022505

Cited by 25 publications

(22 citation statements)

References 18 publications

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“…The uncertainty arises from uncertainty in the wavelength-dependent quantum efficiency of the spectrometer CCD. This value is consistent with literature values for this transition [26,27,[32][33][34][35][36][37][38][39][40], but has an improved uncertainty (see Table I).…”

Section: Resultssupporting

confidence: 92%

Laser-Based Metastable Krypton Generation

et al. 2018

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We demonstrate the generation of metastable krypton in the long-lived 1s^{5} state using laser excitation. The atoms are excited through a two-photon absorption process into the 2p^{6} state using a pulsed optical parametric oscillator laser operating near 215 nm, after which the atoms decay quickly into the metastable state with a branching ratio of 75%. The interaction dynamics are modeled using density matrix formalism and, by combining this with experimental observations, we are able to calculate photoionization and two-photon absorption cross sections. When compared to traditional approaches to metastable production, this approach shows great potential for high-density metastable krypton production with minimal heating of the sample. Here, we show metastable production efficiencies of up to 2% per pulse. The new experimental results gained here, when combined with the density matrix model we have developed, suggest that fractional efficiencies up to 30% are possible under optimal conditions.

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Section: Resultssupporting

confidence: 92%

Laser-Based Metastable Krypton Generation

et al. 2018

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“…From the manufacturer's specification, we estimate that the jitter is relatively small, approximately 1 ns for each laser. The fluorescence blurring primarily occurs because of the time scale associated with the 5p3∕2 2 → 5s3∕2 o 1 and 5p3∕2 2 → 5s3∕2 o 2 transitions (25 ns [64][65][66][67]). We double this value and report that as the uncertainty in Δt.…”

Section: Reduction Of Ktv Datamentioning

confidence: 99%

Krypton tagging velocimetry of an underexpanded jet

Parziale

Smith

Marineau³

2015

Appl. Opt.

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In this work, we present the excitation/emission strategy, experimental setup, and results of an implementation of krypton tagging velocimetry (KTV). KTV is performed as follows: (i) seed a base flow with krypton; (ii) photosynthesize metastable krypton atoms with a frequency-doubled dye laser to form the tagged tracer; (iii) record the translation of the tagged metastable krypton by imaging the laser-induced fluorescence (LIF) that is produced with an additional dye laser. The principle strength of KTV, relative to other tagging velocimetry techniques, is the use of a chemically inert tracer. KTV results are presented for an underexpanded jet of three mixtures of varying Kr/N₂ concentration. It is demonstrated that KTV can be used in gas mixtures of relatively low krypton mole fraction (0.5% Kr/99.5% N₂), and the KTV data from that experiment are found to be in good agreement with an empirical fit found in the literature. We find that KTV is useful to perform instantaneous velocity measurements with metastable krypton as a chemically inert, dilute, long-lifetime tracer in gas-phase flows.

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“…Based upon the Born-Bethe theory we extract, from these cross sections, values for the 1s 5 ÿ 2p 6 and 1s 5 ÿ 2p 9 optical oscillator strengths which agree with optical measurements to within 20% [8]. Although the Bethe theory is a high energy approximation, we found the dipole-type cross sections to track with the corresponding optical oscillator strengths even at very low energies except when the oscillator strength is very small (or zero).…”

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confidence: 60%

Electron-Impact Excitation out of the Metastable Levels of Krypton

et al. 2005

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We have measured the electron-impact excitation cross sections out of the two metastable levels of Kr into the ten levels of the 4p(5)5p configuration. For a common 4p(5)5p final level, the peak excitation cross sections out of the two individual 4p(5)5s metastable levels are found to differ by 1 to 2 orders of magnitude. This is explained by the special features of the electronic structure of the two configurations involved. The peak cross sections are 10 to 1600 times larger than the corresponding peak cross sections out of the ground state.

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Accurate transition rates for the5p−5stransitions in Kr I

Cited by 25 publications

References 18 publications

Laser-Based Metastable Krypton Generation

Laser-Based Metastable Krypton Generation

Krypton tagging velocimetry of an underexpanded jet

Electron-Impact Excitation out of the Metastable Levels of Krypton

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