Groundwater dating with Atom Trap Trace Analysis of 39Ar
Groundwater dating using Atom Trap Trace Analysis of 39Ar. W. Aeschbach- Hertig, T. Reichel, A. Kersting. Institut für Umweltphysik, Heidelberg University, Heidelberg, Germany. R. Purtschert. Climate and Environmental Physics, University of Bern, Bern, Switzerland. F. Ritterbusch, S. Ebser, M. Oberthaler. Kirchhoff-Institut. 2 Oct Abstract. We report on the realization of Atom Trap Trace Analysis for39Ar and its first application to dating of groundwater samples. The presented system achieves an atmospheric39Ar count rate as high as ± atoms/h allowing for the determination of the39Ar concentration in less than a day. On Apr 1, Thomas Reichel (and others) published: First dating of groundwater with Atom Trap Trace Analysis of 39Ar - application.
For an efficient performance of atom-trap trace analysis, it is important to collimate the particles emitted from an effusive source. Their high velocity limits the interaction time with the cooling laser.
Therefore, forces beyond the limits of the scattering force are desirable.
In the laboratory, a gas-chromatographic system at cryogenic temperatures was used to separate pure argon from the extracted gas. We therefore employ the 39 Ar count rate of argon samples derived from atmospheric air commercial bottle argon as a standard for normalization. Publication History Issue online: For more information, please visit our migration page: Apr Rep Progr Phys.
The bichromatic force is a promising candidate for this purpose which is demonstrated here on metastable argon The precollimated atoms are deflected in one dimension and the acquired Doppler shift is detected by absorption spectroscopy. With the experimentally accessible parameters, it was possible to measure a force three times stronger than the scattering force.
Atom Trap Trace Analysis of 39Ar (November 22, )
Systematic studies on its dependence on Rabi frequency, phase difference, and detuning to atomic resonance are compared to the solution of the optical Bloch equations.
We anticipate predictions for a possible application in atom-trap trace analysis of argon and other noble gas experiments, where a high flux of metastable atoms is needed.
Argon was separated from the extracted gas by a gas chromatographic system similar to that developed at the University of Bern [ Riedmann], consisting of nine columns filled with zeolite Li-LSX as selective adsorbent, a quadrupole mass spectrometer to observe the composition of the gas leaving the columns and an activated charcoal trap to catch the argon fraction. Global synthesis of vegetation control on evapotranspiration partitioning Next article in issue: As an inert noble gas and with a half-life of years it is the perfect tracer to fill the dating gap for ice and water samples between 50 and 1, years before present, http://pokiesclub.club/fun-dating-sites/46204620b-dating-46204620o.php which time period no other tracers exist.
We report on the realization of Atom Trap Trace Analysis for 39 Ar and its first application to dating of groundwater samples. The presented system achieves an atmospheric 39 Ar count rate as high as 3.
We demonstrate that the measured count rates are proportional to the 39 Ar concentration by intercomparison with Low-Level Counting results and by measurements on prepared argon samples with defined concentration. For a geophysical application, we degas three different groundwater samples and gas chromatographically extract the argon. The 39 Ar ages inferred from the count rates extend go here the accessible dating range and are in agreement with the Low-Level Counting results as well as with here isotope data.
In spontaneous emission an atom in an excited state undergoes a transition to the ground state and emits a single photon. Associated with the emission is a change of the atomic momentum due to photon recoil. Photon emission can be modified close to surfaces and in cavities. For an ion, localized in front of a mirror, coherence of the emitted resonance fluorescence has been reported.
Previous experiments demonstrated that spontaneous emission destroys motional coherence.
Here we report on motional coherence created by a single spontaneous emission event close to a mirror surface. The coherence in the free atomic motion is verified by atom interferometry. The photon can be regarded as a beamsplitter for an atomic matter-wave and consequently our experiment extends the original recoiling slit Gedanken experiment by Einstein to the case where the slit is in a robust coherent superposition of the two recoils associated with the two paths of the quanta.
We present our study of the realization of atom trap trace analysis for 39 Ar, an ultra-sensitive detection method for rare isotopes based on laser cooling. We report on the experimental determination of the hyperfine spectrum of the relevant cooling transition. A high-intensity, optically collimated beam of metastable argon atoms has been set up, and fluorescence detection of single 40 Ar atoms ina magneto-optical trap is realized.
The deduced efficiencies of each stage lead to an expected 39 Ar count rate of six atoms per hour in the final setup.
Atom Trap Trace Analysis of 39Ar
You can find the lastest results of the project in: Bichromatic force on metastable argon for atom-trap trace analysis Z. A 96, 96 PDF-File. Progress toward a large-scale ion Talbot-Lau interferometer Active SU 1,1 atom interferometry Bichromatic force on metastable argon for atom-trap trace analysis.
Analog quantum simulators for many-body dynamics.