Abstract Details
| Name: Rahul Kumar Kushwaha Affiliation: Physical Research Laboratory Conference ID: ASI2018_1399 Title : Ozone on Callisto Authors and Co-Authors : 1. R K KUSHWAHA, PRL, AHMEDABAD. 2. B-M Cheng-NSRRC, TAIWAN. 3. N J MASON,THE OPEN UNIVERSITY, UK. 4. B SIVARAMAN, PRL, AHMEDABAD. Abstract Type : Poster Abstract Category : Sun and the Solar System Abstract : Ozone has been observed in our solar system icy bodies surfaces, surface of Ganymede [1] in the Jovian system and in the icy surfaces of both Dione and Rhea [2] in the Saturnian system. Ozone synthesized in laboratory based experiments in UV apart from IR range [3]. Well-known Hartley band (220 – 300 nm), in the ultraviolet which is characteristics of photoabsorpion spectra of ozone and provides a unique fingerprint of ozone molecule. Which suggest that ozone might be detected in ice mantles of ISM by similar UV observation. The Vacuum UltraViolet (VUV), 110 - 160 nm, photoabsorption spectra of pure solid ozone revealed the absence of Hartley band while ozone concentrations are low [4]. Hartley band is the only wavelength that is available to-date for the identification of ozone elsewhere, which demands sufficient ozone concentration [4]. Here we have performed experiments on SO2 ices which is one of the constituent of the icy Galilean satellites. We performed irradiation experiments in VUV beamline at NSRRC, Taiwan [4]. Temperature commensurate the icy satellite conditions were maintained at LiF substrate. SO2 was deposited at 9 K and then irradiated with photons (at 10 eV) for few hours. After irradiation spectra were recorded in the 220 nm - 320 nm at different temperatures, but are not limited to 9 K, 20 K, 30 K, 50 K, 80 K, 100 K and 120 K. SO2 peak in 240 - 320 nm region was observed to be broader and also to have shifted after irradiation. This is due to Ozone synthesis within SO2 ice upon irradiation. Here we propose the presence of ozone on Callisto by comparing our experimental result with UV spectra of Callisto from the Hubble space Telescope (HST) observation. References: [1] Noll et al. 1996, Science 273, 341. [2] Noll et al. 1997, Nature 388, 45. [3] Sivaraman et al. 2007, ApJ, 669, 1414. [4] Sivaraman et al. 2014, Chem Phys Lett, 603, 33. |