What is recorded here?
Heiss and colleagues combined pulsed two-photon positronium 1³S₁ → 2³S₁ spectroscopy with excitation of surviving 2S atoms to the 20P Rydberg state and subsequent field ionization. Time-of-flight detection supplied velocity-distribution information for joint fits of spectral profiles and Doppler shifts. Two experimental runs gave a combined interval of 1,233,607,210.5±49.6 MHz, about 40 parts per billion. The second run added an optical frequency comb and a pulse-by-pulse laser-chirp measurement.
Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.
Scientific scope
The combined uncertainty assumes uncorrelated runs and depends on the simulated emission, laser and detector distributions. A Maxwell–Boltzmann distribution fitted the measured time-of-flight data but does not establish that the emitted atoms were thermal. The first run lacked a working absolute-frequency calibration and contemporaneous chirp measurement. Per-atom Doppler correction and sub-MHz continuous-wave precision remained proposed extensions. Printed simulation conventions need clarification before independent reuse; no raw-data replay or comparison with the later formal text was performed.
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People and systems
Michael W. Heiss; Lucas de Sousa Borges; Artem Golovizin; Paolo Crivelli
These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
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English catalogue narrative
Pulsed positronium 1S–2S spectroscopy with Rydberg field-ionization detection
Heiss and colleagues combined pulsed two-photon positronium 1³S₁ → 2³S₁ spectroscopy with excitation of surviving 2S atoms to the 20P Rydberg state and subsequent field ionization. Time-of-flight detection supplied velocity-distribution information for joint fits of spectral profiles and Doppler shifts. Two experimental runs gave a combined interval of 1,233,607,210.5±49.6 MHz, about 40 parts per billion. The second run added an optical frequency comb and a pulse-by-pulse laser-chirp measurement.
Scientific scope
The combined uncertainty assumes uncorrelated runs and depends on the simulated emission, laser and detector distributions. A Maxwell–Boltzmann distribution fitted the measured time-of-flight data but does not establish that the emitted atoms were thermal. The first run lacked a working absolute-frequency calibration and contemporaneous chirp measurement. Per-atom Doppler correction and sub-MHz continuous-wave precision remained proposed extensions. Printed simulation conventions need clarification before independent reuse; no raw-data replay or comparison with the later formal text was performed.
Reading status
This is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.
People and systems
Michael W. Heiss; Lucas de Sousa Borges; Artem Golovizin; Paolo Crivelli
These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.