home page of J P Das

15. J. P. Das, A. Meshik, O. Pravdivtseva and C. M. Hohenberg (2011) A first test of a new Analyte.193 laser ablation system: In-situ Helium, Neon and Argon compositions of chondrule zones and surrounding matrix in NWA 801 CR2 chondrite. 42nd Lunar and Planetary Science Conference, Abstract #2238.

14. J. P. Das, A. Meshik, O. Pravdivtseva and C. M. Hohenberg (2010) Noble gas composition in magnetic and non-magnetic separates from Allende chondrules. 73rd Meteoritical Society Meeting, New York, July26-30, 2010, Abstract # 5373.

13. A. P. Meshik, O. V. Pravdivtseva, J. P. Das and C. M. Hohenberg (2010) Spallogenic Neon-21 in submicron dust from stardust aerogel confirmed. 73rd Meteoritical Society Meeting, New York, July 26-30, 2010, Abstract # 5410.

12. J. P. Das, J. N. Goswami, O. V. Pravdivtseva, A. P. Meshik and C. M. Hohenberg (2010) Cosmogenic neon in individual chondrule fragment: record of pre-compaction exposure. 41st Lunar and Planetary Science Conference, Abstract #1961.

11. J. P. Das, K. Kehm, J. N. Goswami, O. V. Pravdivtseva, A. P. Meshik and C. M. Hohenberg (2009) Cosmogenic neon from individual olivine grains of chondrules and chondrites. Meteoritics and Planetary Science supplement, A56.

10. J. P. Das (2009) Fe/Mg-Fe/Mn systematics of chondrules and their host chondrites: clues for their evolution. 40th Lunar and Planetary Science Conference, Abstract #1497

9. J. P. Das and D-C. Lee (2008) Fe/Mg-Fe/Mn Systematics of Chondrules and Effect of Chondrule Forming Event. Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract #MR13B-1710

8. J. P. Das and S.V.S. Murty (2008) Are chondrules in enstatite chondrites formed in planetary environment? Terrestrial Planets: Evolution through time, 22-25 January 2008 Physical Research Laboratory, Ahmedabad, India.

7. J. P. Das and S.V.S. Murty (2007) Presence of Insoluble organic matter in chondrule precursors. 9th international conference on gas geochemistry, October 1-8, 2007, Taipei, Taiwan

6. J. P. Das and S.V.S. Murty (2007) Search for pre-compaction irradiation records in chondrules. The 31st symposium on Antarctic Meteorites, June 5-7, 2007, NIPR, Tokyo, Japan.

5. J. P. Das and S.V.S. Murty (2007) Nature of precursors and formation environments of chondrules based on nitrogen and noble gases studies of individual chondrules. 12th ISMAS symposium cum workshop on mass spectrometry, March 25-30, 2007, Goa

4. J.P. Das and S.V.S. Murty (2006) Formation of chondrules: clues from nitrogen isotopes. 10th triennial Int. symposium on mass spectrometry, Munnar EPS-9, 103.

3. J.P.Das and S.V.S. Murty (2005) Search for solar cosmic ray records of early Sun in primitive meteorite phases. 29th International Cosmic Ray Conference, Pune 1, 75-78.

2. S.V.S. Murty, J.P. Das, R.R. Mahajan, N. Sinha and J.N. Goswami (2003) Cosmic ray exposure history and trapped nitrogen and noble gases in the lunar meteorite Y983885. International symposium: Evolution of Solar system materials: A new perspective from Antarctic meteorites, Sept.3-5, 2003, NIPR, Tokyo, Japan

1. S.V.S. Murty, R.R. Mahajan, J.P. Das, N. Sinha and J.N. Goswami (2003) Trapped and cosmogenic gas components and nuclear tracks in the Nakhlite Y000593. International symposium: Evolution of Solar system materials: A new perspective from Antarctic meteorites, Sept.3-5, 2003, NIPR, Tokyo, Japan

Address: Washington University in St. Louis Physics Department Campus Box 1105 One Brookings Drive St. Louis, MO 63130-4899 Email: jdas@physics.wustl.edu Phone: (314) 935 5049 Fax: (314) 935 4083
Research Interests: Search for precompaction cosmic ray irradiation records in chondrules Trapped Noble gases in different mineral separates from chondrules	I am a Post Doctoral research associate at the Noble gas lab, Washington university in St. Louis. Our group is also part of the McDonnell center for space sciences. Research Theme Meteorites are record of nebular and planetary processes. My present research is based on chondrites. These type of meteorites carry records of first few million years of our solar system evolution. The measurement of noble gases (He, Ne, Ar, Kr and Xe) in chondrites is among the many ways to find out how our solar system evolved from an infant star to the family of planets. For this quest, I use noble gas mass sepctrometers to measure the composition and amount of noble gases in tiny grains separated from chondrites.
Links Laboratory for Space Sciences	Experience Post Doctoral Fellow (Feb 2008- Jan 2009): Department of Earth Sciences, Academia Sinica, Taipei, PI: Prof. Der Chuen Lee, MC-ICPMS lab. Post Doctoral Fellow (Jan 2007- Jan 2008): Physical Research Laboratory, Ahmedabad, PI: Prof. S. V. S. Murty, Noble Gas lab. Research Scholar (Aug 2001- Jan 2007): Physical Research Laboratory, Ahmedabad, Thesis supervisor: Prof. S. V. S. Murty, Noble Gas lab.
	Peer-Reviewed Publications 5. J. P. Das, J. N. Goswami, O. Pravdivtseva, A. M. Meshik, C. M. Hohenberg (2010) Cosmogenic neon in grains of individual chondrules: Evidence of pre-compaction energetic particle exposure in chondrules, Submitted to Meteoritics and Planetary Science (May-2010). 4. J. P. Das and S. V. S. Murty (2009) Cosmogenic and trapped noble gases in individual chondrules: Clues to chondrule formation, Meteoritics and Planetary Science 44, Nr 11, 1797-1818. 3. J. P. Das and S. V. S. Murty (2009) Trapped nitrogen in individual chondrules: Nature of chondrule precursors and clues to formation mechanisms. Journal of Geophysical Research 114, E01008, doi:10.1029/2008JE003232. 2. J. P. Das and S. V. S. Murty (2008) Nitrogen isotopes in chondrules: Signatures of precursors and formation processes. Current Science 94:485-489. 1. Hsin-Wei Chen, Typhon Lee, Teh-Lung Ku and J. P. Das (2008) Production ratio of Nuclear Fallout 137Cs/135Cs. Chinese journal of Physics 46 (5) 560-569.
	Abstracts @ Conferences 15. J. P. Das, A. Meshik, O. Pravdivtseva and C. M. Hohenberg (2011) A first test of a new Analyte.193 laser ablation system: In-situ Helium, Neon and Argon compositions of chondrule zones and surrounding matrix in NWA 801 CR2 chondrite. 42nd Lunar and Planetary Science Conference, Abstract #2238. 14. J. P. Das, A. Meshik, O. Pravdivtseva and C. M. Hohenberg (2010) Noble gas composition in magnetic and non-magnetic separates from Allende chondrules. 73rd Meteoritical Society Meeting, New York, July26-30, 2010, Abstract # 5373. 13. A. P. Meshik, O. V. Pravdivtseva, J. P. Das and C. M. Hohenberg (2010) Spallogenic Neon-21 in submicron dust from stardust aerogel confirmed. 73rd Meteoritical Society Meeting, New York, July 26-30, 2010, Abstract # 5410. 12. J. P. Das, J. N. Goswami, O. V. Pravdivtseva, A. P. Meshik and C. M. Hohenberg (2010) Cosmogenic neon in individual chondrule fragment: record of pre-compaction exposure. 41st Lunar and Planetary Science Conference, Abstract #1961. 11. J. P. Das, K. Kehm, J. N. Goswami, O. V. Pravdivtseva, A. P. Meshik and C. M. Hohenberg (2009) Cosmogenic neon from individual olivine grains of chondrules and chondrites. Meteoritics and Planetary Science supplement, A56. 10. J. P. Das (2009) Fe/Mg-Fe/Mn systematics of chondrules and their host chondrites: clues for their evolution. 40th Lunar and Planetary Science Conference, Abstract #1497 9. J. P. Das and D-C. Lee (2008) Fe/Mg-Fe/Mn Systematics of Chondrules and Effect of Chondrule Forming Event. Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract #MR13B-1710 8. J. P. Das and S.V.S. Murty (2008) Are chondrules in enstatite chondrites formed in planetary environment? Terrestrial Planets: Evolution through time, 22-25 January 2008 Physical Research Laboratory, Ahmedabad, India. 7. J. P. Das and S.V.S. Murty (2007) Presence of Insoluble organic matter in chondrule precursors. 9th international conference on gas geochemistry, October 1-8, 2007, Taipei, Taiwan 6. J. P. Das and S.V.S. Murty (2007) Search for pre-compaction irradiation records in chondrules. The 31st symposium on Antarctic Meteorites, June 5-7, 2007, NIPR, Tokyo, Japan. 5. J. P. Das and S.V.S. Murty (2007) Nature of precursors and formation environments of chondrules based on nitrogen and noble gases studies of individual chondrules. 12th ISMAS symposium cum workshop on mass spectrometry, March 25-30, 2007, Goa 4. J.P. Das and S.V.S. Murty (2006) Formation of chondrules: clues from nitrogen isotopes. 10th triennial Int. symposium on mass spectrometry, Munnar EPS-9, 103. 3. J.P.Das and S.V.S. Murty (2005) Search for solar cosmic ray records of early Sun in primitive meteorite phases. 29th International Cosmic Ray Conference, Pune 1, 75-78. 2. S.V.S. Murty, J.P. Das, R.R. Mahajan, N. Sinha and J.N. Goswami (2003) Cosmic ray exposure history and trapped nitrogen and noble gases in the lunar meteorite Y983885. International symposium: Evolution of Solar system materials: A new perspective from Antarctic meteorites, Sept.3-5, 2003, NIPR, Tokyo, Japan 1. S.V.S. Murty, R.R. Mahajan, J.P. Das, N. Sinha and J.N. Goswami (2003) Trapped and cosmogenic gas components and nuclear tracks in the Nakhlite Y000593. International symposium: Evolution of Solar system materials: A new perspective from Antarctic meteorites, Sept.3-5, 2003, NIPR, Tokyo, Japan
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