Bing-Ming Cheng

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Cross sections for photoabsorption of NH 3 , NH 2 D, NHD 2 , and ND 3 in the spectral region 140Y220 nm were determined at $298 K using synchrotron radiation. Absorption spectra of NH 2 D and NHD 2 were deduced from spectra of mixtures of NH 3 and ND 3 , of which the equilibrium concentrations for all four isotopologues obey statistical distributions. Cross(More)
Following the recent identification of ethanethiol in the interstellar medium (ISM) we have carried out Vacuum UltraViolet (VUV) spectroscopy studies of ethanethiol (CH3CH2SH) from 10 K until sublimation in an ultrahigh vacuum chamber simulating astrochemical conditions. These results are compared with those of methanethiol (CH3SH), the lower order thiol(More)
In this paper we propose a multiphase model with nonequilibrated temperatures but with equal velocities and pressures for each species. Turbulent mixing is driven by diiusion in these equations. The closure equations are deened in part by reference to a more exact chunk mix model developed by the authors and coworkers which has separate pressures,(More)
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