Surface science investigations of the role of CO2 in

astrophysical ices

by John L. Edridge, Kati Freimann, Daren J. Burke, and Wendy A. Brown

Philosophical Transactions AVolume 371(1994):20110578

July 13, 2013

©2013 by The Royal Society

TPD spectra for CO2 adsorbed on HOPG at 33 K.

John L. Edridge et al. Phil. Trans. R. Soc. A 2013;371:20110578

©2013 by The Royal Society

Simulated TPD spectra of a 0.3 μm thick 13% CO2:H2O ice using a heating rate of T=1.706×10−4×time1.289 [53], characteristic of the warming of a hot core near to a medium mass

star.

John L. Edridge et al. Phil. Trans. R. Soc. A 2013;371:20110578

©2013 by The Royal Society

TPD spectra for CO2 adsorbed on ASW on HOPG at 33 K.

John L. Edridge et al. Phil. Trans. R. Soc. A 2013;371:20110578

©2013 by The Royal Society

A comparison of TPD spectra recorded for equivalent doses of pure CO2 ice on HOPG (d), CO2 adsorbed on top of 100 L of ASW ice (c) and 100 L of a 15% CO2:H2O ice co-deposited mixture

(b).

John L. Edridge et al. Phil. Trans. R. Soc. A 2013;371:20110578

©2013 by The Royal Society

(a) RAIR spectra of a range of exposures of CO2 adsorbed on HOPG at 28 K.

John L. Edridge et al. Phil. Trans. R. Soc. A 2013;371:20110578

©2013 by The Royal Society

A comparison of RAIR spectra recorded for a range of CO2 ices adsorbed on HOPG at 30 K.

John L. Edridge et al. Phil. Trans. R. Soc. A 2013;371:20110578

©2013 by The Royal Society

TPD spectra recorded for desorption of an ice consisting of 20 L of CO2 adsorbed on top of 100 L of a 15% CH3OH:H2O mixed ice, adsorbed on HOPG at 33 K.

John L. Edridge et al. Phil. Trans. R. Soc. A 2013;371:20110578

©2013 by The Royal Society