Laser Laboratory for Trace Analysis and Precision Measurements

Radiokrypton dating

• Enhancement of the ⁸¹Kr and ⁸⁵Kr count rates by optical pumping

  Z. Y. Zhang et al., Phys. Rev. A 101, 053429 (2020). [DOI]

• An electromagnetic separation system for the enrichment of ³⁹Ar

  Z. H. Jia et al., Rev. Sci. Instrum. 91, 033309 (2020). [DOI]

• Identifying recharge processes into a vast 'fossil' aquifer based on dynamic groundwater ⁸¹Kr age evolution

  R. Ram et al., Journal of Hydrology 587, 124946 (2020). [DOI]

• Krypton-81 dating of the deep Continental Intercalaire aquifer with implications for chlorine-36 dating

  T. Matsumoto et al., Earth Planet. Sci. Lett. 535, 116120 (2020). [DOI]

• Dual Separation of Krypton and Argon from Environmental Samples for Radioisotope Dating

  X.-Z. Dong et al., Anal. Chem. 91, 21, 13576-13581 (2019). [DOI]

• Radiokrypton unveils dual moisture sources of a deep desert aquifer

  R. Yokochi et al., Proc. Natl. Acad. Sci. 116, 16222 (2019). [DOI]

• ⁸¹Kr dating of the Guliya ice cap, Tibetan Plateau

  L. Tian et al., Geophys. Res. Lett. 46, 6636 (2019). [DOI]

• Latest development of radiokrypton dating – A tool to find and study paleogroundwater

  W. Jiang et al., Quaternary International, in press (2019). [DOI]

• Recent seawater intrusion into deep aquifer determined by the radioactive noble-gas isotopes ⁸¹Kr and ³⁹Ar

  Y. Yechieli et al., Earth and Planet. Sci. Lett. 507, 21 (2019). [DOI]

• Using ⁸¹Kr and noble gases to characterize and date groundwater and brines in the Baltic Artesian Basin on the one-million-year timescale

  Christoph Gerber et al., Geochim. Cosmochim. Acta 205, 187-210 (2017). [DOI]

• Radiokrypton dating coming of age

  Z.-T. Lu,Nat. Sci. Rev 3(2), 172 (2016). [DOI]

• Continental degassing of ⁴He by surficial discharge of deep groundwater

  P.K. Aggarwal et al., Nature Geo. 8, 35 (2015). [DOI]

• Radiometric ⁸¹Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica

  C. Buizert et al., Proc. Nat. Acad. Sci. 111, 6876 (2014). [DOI]
  ( See accompanying Commentary : Aeschbach-Hertig, W. ibid )

• Tracer Applications of Noble Gas Radionuclides in the Geosciences

  Z.-T. Lu et al., Earth Sci. Rev. 138, 196 (2014). [DOI]

• Analysis of ⁸⁵Kr: a comparison at the 10^-14 level using micro-liter samples

  G.-M. Yang et al., Sci. Rep. 3, 1596 (2013). [DOI]

• An Atom Counter for Measuring ⁸¹Kr and ⁸⁵Kr in Environmental Samples

  W. Jiang et al., Geochim. Cosmochim. Acta 91, 1-6 (2012). [DOI]

• Ar-39 Detection at the 10^-16 Isotopic Abundance Level with Atom Trap Trace Analysis

  W. Jiang. et al., Phys. Rev. Lett. 106, 103001 (2011). [DOI]
  ( See accompanying Physics Synopsis )

• Ultrasensitive isotope trace analyses with a magneto-optical trap

  C.Y. Chen et al., Science 286, 1139 (1999). [DOI]

Atmospheric molecules

• Rovibrational line lists for nine isotopologues of the CO molecule in the X¹Sigma⁺ ground electronic state

  G. Li et al., Astrophys. J. Supp. 216, 15 (2015). [DOI]

• Ultra-sensitive, self-calibrated cavity ring-down spectroscopy for quantitative trace-gas analysis

  B. Chen et al., App. Opt. 53(32), 7716-7723 (2014). [DOI]

• Line parameters of the 782 nm band of CO₂

  Y. Lu et al., Astrophys. J. 775(1), 71 (2013). [DOI]

• The 4v_CH overtone of ¹²C₂H₂, sub-MHz precision spectrum reveals perturbations

  A.-W. Liu et al., J. Chem. Phys. 138, 014312 (2013). [DOI]

• The v=3<-0 S(0)-S(3) electric quadrupole transitions of H₂ near 0.8 um

  S.-M. Hu et al., Astrophys. J. 749(1), 76 (2012). [DOI]

• Electric-quadrupole transition of H₂ determined to 10^-9 precision

  C.-F. Cheng et al., Phys. Rev. A 85(2), 024501 (2012). [DOI]

Boltzmann constant

• Doppler broadening thermometry based on cavity ring-down spectroscopy

  C.-F. Cheng et al., Metrologia 52, S385-S393 (2015). [DOI]

• Application of cavity ring-down spectroscopy to the Boltzmann constant determination

  Y. R. Sun et al., Opt. Exp. 19(21), 19993–20002 (2011). [DOI]

Matrix-embedded atoms

• Measurement of the Hyperfine Quenching Rate of the Clock Transition in ¹⁷¹Yb

  C.-Y. Xu et al., Phys. Rev. Lett. 113, 033003 (2014). [DOI]

• Phonon coupling of water monomers in a solid nitrogen matrix

  L. Wu et al., J. Chem. Phys. 138, 114304 (2013). [DOI]

• Electronic spectroscopy ytterbium in a neon matrix

  R. Lambo et al., J. Chem. Phys. 137, 204315 (2012). [DOI]

• Optical Excitation and Decay Dynamics of Ytterbium Atoms Embedded in a Solid Neon Matrix

  C.-Y. Xu et al., Phys. Rev. Lett. 107, 093001 (2011).

The helium atom

• Measurement of the Frequency of the 2³S-2³P Transition of ⁴He

  X. Zheng (郑昕), Y. R. Sun (孙羽), J.-J. Chen (陈娇娇), W. Jiang (蒋蔚), K. Pachucki, and S.-M. Hu (胡水明)

  Physical Review Letters, 119, 263002, (2017). [DOI]

• Laser spectroscopy of the fine-structure splitting in the 2³P_J levels of ⁴He

  X. Zheng, Y. R. Sun*, J.-J. Chen, W. Jiang, K. Pachucki, S.-M. Hu*
  Physical Review Letters, 118, 063001, (2017). [DOI]

• Laser spectroscopy measurement of the fine structure splitting 2³P₁-2³P₂ of ⁴He

  G.-P. Feng et al., Phys. Rev. A 91, 030502(R) (2015). [DOI]

• Laser probing of halo nuclei in light atoms

  Z.-T. Lu et al., Rev. Mod. Phys. 85, 1383 (2013). [DOI]

• Precision spectroscopy of the helium atom

  S.-M. Hu et al., Front. Phys. China 4, 165 (2009). [DOI]

• Nuclear charge radius of ⁸He

  P. Mueller et al. Phys. Rev. Lett. 99, 252501 (2007). [DOI]

• Laser spectroscopic determination of the ⁶He nuclear charge radius

  L.-B. Wang et al. Phys. Rev. Lett. 93, 142501 (2004). [DOI]

EDM of radium-225

• Improved limit on the ²²⁵Ra electric dipole moment

  Michael Bishof et al., Phys. Rev. C 94, 025501 (2016). [DOI]

• First measurement of the atomic electric dipole moment of ²²⁵Ra

  R. H. Parker et al., Phys. Rev. Lett. 114, 233002 (2015). [DOI]
  (see accompanying Physics Synopsis)

• Laser-trapping of Ra-225 and Ra-226 with repumping by room temperature blackbody radiation

  J. R. Guest et al., Phys. Rev. Lett. 98, 093001 (2007). [DOI]