Application of isotope effects during Photodissociation reactions to estmate Archean Atmospheric Pressure

• Project/Area Number: 24740364
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geochemistry/Astrochemistry
• Research Institution: Sophia University
• Principal Investigator: DANIELACHE Sebastian 上智大学, 理工学部, 助教 (00595754)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 同位体 / 古大気 / 硫黄同位体 / 国際情報交換

Research Abstract

Sulfur dioxide and its photochemistry plays an important role in planetary atmospheres. SO2 has been emitted by volcanic activity from the Hadean and Archean ages up to the present day. It is thought that the photochemistry of SO2 is responsible for the remarkable mass independent distributions of sulfur isotopes found in Archean rocks, driving research into the photolysis rates of SO2 isotopologues. The purpose of this project is to expand the application of sulfur mass independent fractionations to estimate not only the chemical composition but also the pressure and temperature conditions of the Archean atmosphere. We used a dual beam monochromator in order to obtain higher accuracy cross section that is complementary to high spectral resolution Fourier transform spectrometer. The observed pressure dependence of cross sections may indicate S-MIF can be changed as a function of atmospheric pressure.

Research Products

• [Journal Article] Non-adiabatic calculations of ultraviolet absorption cross-section of Sulfur Monoxide; Isotopic effects on the photo-dissociation reaction (2014)
  • Author(s): S. O. Danielache, S. Tomoya, A. Kondorskiy, I. Tokue, S. Nanbu
  • Journal Title: J. Chem. Phys. Volume: 140 Issue: 4 Pages: 44319-44319
  • DOI: 10.1063/1.4862429
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Photo absorption cross-section measurements of 32S, 33S, 34S and 36S sulfur dioxide for the B1B1-X1A1 absorption band (2012)
  • Author(s): Sebastian Danielache
  • Journal Title: J. Geophys. Res. Atmos. Volume: 117 Issue: D24 Pages: 1-11
  • DOI: 10.1029/2012jd017464
  • Peer Reviewed
• [Journal Article] Photoabsorption cross-section measurements of 32S, 33S, 34S and 36S sulfur dioxide from 190 to 220nm
  • Author(s): Y. Endo, S. O. Danielache, Y. Ueno, S. Hattori, S. Johnson, N. Yoshida, H. G. Kjaergaard
  • Journal Title: Journal of Geophysical Research-Atmospheres Volume: (MS2014JD021671)
  • Peer Reviewed
• [Presentation] SO^2紫外線スペクトルにおける圧力及び同位体効果 (2013)
  • Author(s): S.O Danielache, 遠藤美朗, 鈴木智也, 上野雄一郎, 南部伸孝, M. Johnson
  • Organizer: 第7分子科学討論会
  • Place of Presentation: 京都(Oral)
  • Year and Date: 2013-09-27
• [Presentation] SO^2の光解離における波長依存同位体分別、理論計算による高分解能スペクトルおよびセルフシールディング効果 (2013)
  • Author(s): S.O Danielache
  • Organizer: 日本地球化学会61回年会
  • Place of Presentation: 筑波大学(Oral)
  • Year and Date: 2013-09-12
• [Presentation] Non-adiabatic calculations of ultraviolet absorption cross section of Sulfur Monoxide; Isotopic effects on the photodissociation reaction (2013)
  • Author(s): S. O. Danielache, T. Suzuki, S. Nanbu
  • Organizer: 2013 Goldschmidt Conference
  • Place of Presentation: Firenze, Italy(Oral)
  • Year and Date: 2013-08-30
• [Presentation] Pressure-dependent change of ultraviolet absorption cross section of SO_2 isotopologues and S-MIF (2013)
  • Author(s): Y. Endo, S. O. Danielache, Y. Ueno, S. Hattori, S. Johnson, N. Yoshida, H. G. Kjaergaard
  • Organizer: 2013 Goldschmidt Conference
  • Place of Presentation: Firenze, Italy(Poster)
  • Year and Date: 2013-08-29
• [Presentation] Pressure-dependent change of ultraviolet absorption cross section of SO2 isotopologues and S-MIF (2013)
  • Author(s): YOSHIAKI ENDO, SEBASTIAN O. DANIELACHE, YUICHIRO UENO, SHOHEI HATTORI, MATTHEW S. JOHNSON and HENRIK G. KJAERGAARD
  • Organizer: Godschmidt Conference 2013
  • Place of Presentation: フィレンジェ イタリア
• [Presentation] Photodissociation origin of Archean S-MIF and dynamical sulfur cycling under highly reducing atmosphere (2012)
  • Author(s): YUICHIRO UENO, SEBASTIAN DANIELACHE, YOSHIAKI ENDO, MATTHEW JOHNSON, NAOHIRO YOSHIDA
  • Organizer: Goldschmidt 2012
  • Place of Presentation: Motreal, Canada
• [Presentation] SPECTROSCOPIC PREDICTION OF 36S ANOMALY BY SO2 PHOTOLYSIS AND THE ARCHAEAN ATMOSPHERE (2012)
  • Author(s): Yuichiro Ueno, Sebastian O. Danielache, Matthew Johnson
  • Organizer: The Sixth International Symposium on Isotopomers
  • Place of Presentation: Washington, USA