Publications

26. R. Yokochi et al., Field degassing as a new method for 14C analyses in old groundwater. (in press for Radiocarbon: CO2-14C_RY_ReRev)

25. R. Yokochi (2016), Recent developments on field gas extraction and sample preparation meth- ods for radiokrypton dating of groundwater. Journal of Hydrology, 540, 368-378 (2016_Kr_Prep)

24. T. Stephan, R. Trappitsch, A.M. Davis, M.J. Pellin, D. Rost, M.R. Savina, R. Yokochi, N. Liu (2016). CHILI – the Chicago Instrument for Laser Ionization – a new tool for isotope measurements in cosmochemistry. International Journal of Mass Spectrometry, 407, 1-15.

23. P.K. Aggarwal, T. Matsumoto, N.C. Sturchio, H.K. Chang, D. Gastmans, L. J. Araguas- Araguas, W. Jiang, Z.-T Lu, P. Mueller, R. Yokochi, R. Purtschert, T. Torgersen (2014). Continental degassing of 4He by surficial discharge of deep groundwater. Nature Geoscience, 8, 35-39

22. Z.-T. Lu, P. Schlosser, W.M. Smethie Jr., N.C. Sturchio, T.P. Fischerf B.M. Kennedy, R. Purtschert, J.P. Severinghaus, D.K. Solomon, T. Tanhuak, R. Yokochi (2014) Tracer Applications of Noble Gas Radionuclides in the Geosciences. Earth-Science Reivews, 138, 196-214

21. N.C. Sturchio, K.L. Kuhlman, R. Yokochi, P.C. Probst, W. Jiand, Z.-T. Lu, P. Mueller, G.-M. Yang (2014) Krypton-81 in groundwater of the Culebra Dolomite near the Waste Isolation Pilot Plant, New Mexico. Journal of Contaminant Hydrology, 160, 12-20

20. T. Ireland, F. Tissot, R. Yokochi and N. Dauphas (2013) Teflon-HPLC: A novel chromato- graphic system for application to isotope geochemistry and other industries. Chemical Geology, 357, 203-214.

19. R. Yokochi, N.C. Sturchio, R. Purtschert, W. Jiang, G.-M. Yang, P. Mueller, Z.-T. Lu, and B.M. Kennedy (2013) Noble Gas Radionuclides in Yellowstone Geothermal Gas Emissions: A Reconnaissance. Chemical Geology, 339, 43-51.

18. R. Purtschert, R. Yokochi and N. Sturchio (2013) 81Kr dating of old groundwater. in ”Dating old groundwater: A guide book”, A. Suckow (Ed.), IAEA, pp. 400

17. R. Yokochi, N. Sturchio, R. Purtschert (2012). Determination of crustal fluid residence times using nucleogenic 39Ar. Geochimica et Cosmochimica Acta, 88, 19-26.

16. R. Yokochi, U. Marboeuf, E. Quirico & B. Schmitt (2012). Pressure dependent trace gas trapping in amorphous water ice at 77K: Implications for determining conditions of comet formation. Icarus, 218 (2), 760-770.

15. R. Yokochi & A.M. Mandell (2011) Water, delivery on Earth. in Encyclopedia of Astrobiology, M. Gargaud, R. Amils, J. C. Quintanilla, H. J. Cleaves, W. M. Irvine, D. L. Pinti, & M. Viso (Eds.), Springer, pp. 1770-1773.

14. W. Williams, Lu, Z.-T., K. Rudinger, C. Xu, R. Yokochi & P. Mueller (2011). Spectroscopic study of the cycling transition 4s[3/2]2-4p[5/2]3 at 811.8 nm in 39Ar: Hyperfine structure and isotope shift. Physical Review A, 83, 012512

13. R. Yokochi, B. Marty, G. Chazot and P. Burnard, Nitrogen in peridotite xenolith: Large isotopic heterogeneity and N2/Ar enrichment. (2009) Geochimica et Cosmochimica Acta 73, 4843-4861.

12. N. Coltice, B. Marty and R. Yokochi (2009) Xenon constraints on the thermal evolution of the Earth. Chemical Geology 266 (1-2), 4-9.

11. R. Yokochi, N. Sturchio and L. Heraty (2008) Method for purification of Kr from environmental samples for analysis of radiokrypton isotopes. Analytical Chemistry 80(22), 8688-8693.

10. R. Yokochi, D. Ohnenstetter and Y. Sano (2008) Intra-grain variation in 13C and nitrogen concentration associated with textural heterogeneities of carbonado. The Canadian Mineral- ogist 46(5), 1283-1296.

9. B. Marty and R. Yokochi (2006) Water in the Early Earth. in Water in Nominally anhydrous minerals (Reviews in Mineralogy and Geochemistry) 62, 421-450.

8. P.-H. Blard, R. Pik, J. Lav, D. Bourls, P.G. Burnard, R. Yokochi, B. Marty and F. Trusdell (2006) Cosmogenic 3He production rates revisited from evidences of grain size dependent release of matrix-sited helium. Earth and Planetary Science Letters 247 (3-4), 222-234.

7. R. Yokochi and B. Marty (2006) Nitrogen isotope disequilibrium in mantle xenoliths, Fast chemical and isotopic exchange of nitrogen during reaction with hot molybdenum. Geochemistry Geophysics Geosystems 7 (1), Q07004, doi:10.1029.

6. R. Yokochi and B. Marty (2005) Geochemical Constraints on Mantle Dynamics in the Hadean. Earth and Planetary Science Letters 238, 17-30.

5. R. Yokochi, B. Marty, R. Pik and P. Burnard (2005). High 3He/4He ratios in peridotite xenoliths from SW Japan revisited: Evidence for cosmogenic 3He released by vacuum crushing. Geochemistry Geophysics Geosystems 1 (6), Q01004, doi:10.1029.

4. R. Yokochi and B. Marty (2004) A determination of neon isotopic composition of the deep mantle. Earth and Planetary Science Letters 225, 77-88.

3. Y. Sano, T. Kosugi, N. Takahata and R. Yokochi (2004) Helium isotopes in Pacific waters from adjacent region of Honshu, Japan. Journal of Oceanography 60, 625-630.

2. N. Takahata, R. Yokochi, Y. Nishio and Y. Sano (2003) Volatile element isotope systematics at Ontake volcano, Japan. Geochemical Journal 37, 299-310.

1. Y. Sano, R. Yokochi, K. Terada, M.L. Chaves and M. Ozima (2002) Ion Probe Pb-Pb dating of carbonado, polycrystalline diamond. Precambrian Research 133, 155-168.

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