Advances in Astrophysics

Download PDF (422.7 KB) PP. 250 - 256 Pub. Date: October 18, 2018

DOI: 10.22606/adap.2018.34004

• Bhaskar J. Saikia^*
  Department of Physics, Anandaram Dhekial Phookan College, Nagaon, India
• G. Parthasarathy
  National Geophysical Research Institute (CSIR-NGRI), Hyderabad, India
• Rashmi R. Borah
  Department of Physics, Nowgong College, Nagaon, India

We report here for the first time the possible presence of organic compounds in Sadiya (LL5) ordinary chondrite using micro-Raman and infrared spectroscopic technique. The micro-Raman spectrum exhibits the diamond and graphite peaks correspondingly at 1331 cm-1, 1349 cm-1 and 1588 – 1618 cm-1. The full wave at half maximum value of about 18 cm-1 for Sadiya indicating the nature of disordered phase involved shock metamorphism in the meteorite samples. The diamond and graphite peaks intensity ratio (~0.53) indicates the disordered nature of graphite. The infrared spectrum in the range 2700–3000 cm-1 indicates the presence of CH3 asymmetric stretching, and CH2 symmetric and asymmetric stretching modes due to aliphatic hydrocarbons. This study has strong implications in understanding of the organic compounds in extra-terrestrial materials.

Sadiya meteorite, Raman, infrared, organic compound.

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