Development of a technique for the precise determination of atomic lifetimes based on photon echoes

Beica, H. C.; Pouliot, A.; Dowling, P.; Carew, A.; Vacheresse, Thomas; Carlse, Gehrig; Marmet, L.; Kumarakrishnan, A.

doi:10.1103/physreva.101.033408

Cited by 2 publications

(3 citation statements)

References 33 publications

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“…To facilitate this, our ongoing efforts include accurate measurements of A 21 with precision approaching 0.05%, using coherent control and RF heterodyne detection schemes. 42 The lifetime measurements will also help test the independence of spontaneous emission coefficient across individual isotope and hyperfine transitions to a higher precision. These improvements will help lower the relative combined standard uncertainty to (0.07 to 0.1)% level, a near 10-fold improvement to the MS values reported here.…”

Section: Resultsmentioning

confidence: 99%

“…Theoretical calculations that aim to compute spontaneous emission coefficients require to be tested and improved with accurate and high-precision experimental data. To facilitate this, our ongoing efforts include accurate measurements of A 21 with precision approaching 0.05%, using coherent control and RF heterodyne detection schemes . The lifetime measurements will also help test the independence of spontaneous emission coefficient across individual isotope and hyperfine transitions to a higher precision.…”

Section: Resultsmentioning

confidence: 99%

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Comparison of Primary Laser Spectroscopy and Mass Spectrometry Methods for Measuring Mass Concentration of Gaseous Elemental Mercury

et al. 2020

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We present a direct comparison between two independent methods for the measurement of gaseous elemental mercury (GEM) mass concentration: isotope dilution cold-vapor inductively coupled plasma mass spectrometry (ID-CV-ICP-MS) and laser absorption spectroscopy (LAS). The former technique combined with passive sorbent tube sampling is currently the primary method at NIST for mercury gas standards traceability to the International System of Units (SI). This traceability is achieved via measurements on a mercury-containing reference material. The latter technique has been recently developed at NIST and involves real-time measurements of light attenuation caused by GEM, with SI traceability based in part on the known spontaneous emission lifetime of the probed 6 1S0–6 3P1 intercombination transition of elemental mercury (Hg0). Using a steady-flow Hg0-in-air generator to produce samples measured by both methods, we use LAS to measure the sample gas and in parallel we collect the Hg0 on sorbent tubes to be subsequently analyzed using ID-CV-ICP-MS. Over the examined mass concentration range (41 μg/m3 to 287 μg/m3 Hg0 in air), the relative disagreement between the two approaches ranged from (1.0 to 1.8)%. The relative combined standard uncertainty on average is 0.4% and 0.9%, for the LAS and MS methods, respectively. Our comparison studies help validate the accuracy of the ID-CV-ICP-MS primary method as well as establish the LAS technique as an attractive alternative primary method for SI-traceable measurements of GEM.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Comparison of Primary Laser Spectroscopy and Mass Spectrometry Methods for Measuring Mass Concentration of Gaseous Elemental Mercury

et al. 2020

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“…In pursuit of Hg isotope measurements achieving permillevel precision, we intend to refine the experiment to provide spectra with improved line shape fidelity. Strategies for lowering the uncertainty of GEM measurement based on more accurate measurements of the Einstein coefficient 44 have the potential to substantially reduce this systematic component of measurement uncertainty.…”

Section: ■ Conclusionmentioning

confidence: 99%

Primary Measurement of Gaseous Elemental Mercury Concentration with a Dynamic Range of Six Decades

Srivastava

Hodges

2022

Anal. Chem.

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We present a primary method for absolute reference material-free measurement of gaseous elemental mercury mass concentration based on laser absorption spectroscopy at wavelengths near 254 nm and anchored to the international system of units. A 76 m-long multipass cell provides a detection limit of 1 ng m–3 for an averaging time of 8 min. A dual-cell arrangement, comprising a single-pass and a multipass cell, provides a dynamic range of six decades and spans from ambient to emission levels of gaseous elemental mercury (1 ng m–3 to 1000 μg m–3). The relative standard uncertainty of the measurement is 0.5% in the 0.25 to 1000 μg m–3 range.

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Development of a technique for the precise determination of atomic lifetimes based on photon echoes

Cited by 2 publications

References 33 publications

Comparison of Primary Laser Spectroscopy and Mass Spectrometry Methods for Measuring Mass Concentration of Gaseous Elemental Mercury

Comparison of Primary Laser Spectroscopy and Mass Spectrometry Methods for Measuring Mass Concentration of Gaseous Elemental Mercury

Primary Measurement of Gaseous Elemental Mercury Concentration with a Dynamic Range of Six Decades

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