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Title: Vacuum ultraviolet and infrared spectra of condensed methyl acetate on cold astrochemical dust analogs

Following the recent report of the first identification of methyl acetate (CH{sub 3}COOCH{sub 3}) in the interstellar medium (ISM), we have carried out vacuum ultraviolet (VUV) and infrared (IR) spectroscopy studies on methyl acetate from 10 K until sublimation in an ultrahigh vacuum chamber simulating astrochemical conditions. We present the first VUV and IR spectra of methyl acetate relevant to ISM conditions. Spectral signatures clearly showed molecular reorientation to have started in the ice by annealing the amorphous ice formed at 10 K. An irreversible phase change from amorphous to crystalline methyl acetate ice was found to occur between 110 K and 120 K.
Authors:
 [1] ; ;  [2] ; ;  [3] ; ; ; ;  [4] ;  [5]
  1. Space and Atmospheric Sciences Division, Physical Research Laboratory, Ahmedabad 380009 (India)
  2. Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA (United Kingdom)
  3. National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan (China)
  4. Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400005 (India)
  5. B-4, Indus-1, BARC Spectroscopy Lab at Indus-1, Atomic and Molecular Physics Division, BARC, Mumbai and RRCAT, Indore 452013 (India)
Publication Date:
OSTI Identifier:
22341887
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 778; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNEALING; COSMOLOGY; DUSTS; FAR ULTRAVIOLET RADIATION; ICE; INFRARED SPECTRA; INTERSTELLAR SPACE; METHYL ACETATE; MOLECULES; SOLIDS; SPACE; STELLAR ATMOSPHERES; SUBLIMATION