scholarly journals Impact of oxygen chemistry on model interstellar grain surfaces

2018 ◽  
Vol 20 (8) ◽  
pp. 5368-5376 ◽  
Author(s):  
A. Rosu-Finsen ◽  
M. R. S. McCoustra
Keyword(s):  
Infrared Spectroscopy ◽  
Molecular Oxygen ◽  
Amorphous Silica ◽  
Amorphous Solid ◽  
Temperature Programmed Desorption ◽  
Crystalline Solid ◽  
Amorphous Solid Water ◽  
Reflection Absorption Infrared Spectroscopy ◽  
Solid Water ◽  
Temperature Programmed

Temperature-programmed desorption (TPD) and reflection–absorption infrared spectroscopy (RAIRS) are used to probe the effect of atomic and molecular oxygen (O and O2) beams on amorphous silica (aSiO2) and water (H2O) surfaces (porous-amorphous solid water; p-ASW, compact amorphous solid water; c-ASW, and crystalline solid water; CSW).

Adsorption and reaction pathways of a chiral probe molecule, S-glycidol on a Pd(111) surface

2015 ◽  
Vol 5 (2) ◽  
pp. 738-742 ◽  
Author(s):  
Mausumi Mahapatra ◽  
Wilfred T. Tysoe
Keyword(s):  
Infrared Spectroscopy ◽  
Reaction Pathway ◽  
Temperature Programmed Desorption ◽  
Reaction Pathways ◽  
Probe Molecule ◽  
Reflection Absorption Infrared Spectroscopy ◽  
Temperature Programmed

The chemistry of S-glycidol is studied on a Pd(111) surface using temperature-programmed desorption and reflection–absorption infrared spectroscopy to explore its suitability as a chiral probe molecule and to follow its reaction pathway.

scholarly journals Surface science investigations of the role of CO 2 in astrophysical ices

2013 ◽  
Vol 371 (1994) ◽  
pp. 20110578 ◽  
Author(s):  
John L. Edridge ◽  
Kati Freimann ◽  
Daren J. Burke ◽  
Wendy A. Brown
Keyword(s):  
Surface Science ◽  
Amorphous Solid ◽  
Temperature Programmed Desorption ◽  
Surface Data ◽  
Reflection Absorption Infrared Spectroscopy ◽  
Temperature Programmed ◽  
Astrophysical Ices ◽  
Dust Grain ◽  
Science Investigations

We have recorded reflection–absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD) data for a range of CO 2 -bearing model astrophysical ices adsorbed on a graphitic dust grain analogue surface. Data have been recorded for pure CO 2 , for CO 2 adsorbed on top of amorphous solid water, for mixed CO 2 :H 2 O ices and for CO 2 adsorbed on top of a mixed CH 3 OH:H 2 O ice. For the TPD data, kinetic parameters for desorption have been determined, and the trapping behaviour of the CO 2 in the H 2 O (CH 3 OH) ice has been determined. Data of these types are important as they can be used to model desorption in a range of astrophysical environments. RAIR spectra have also shown the interaction of the CO 2 with H 2 O and CH 3 OH and can be used to compare with astronomical observations, allowing the accurate assignment of spectra.

KINETIC AND REACTIVE PROPERTIES OF ETHYLENE ON CLEAN AND HYDROGEN-COVERED Pd(111)

2003 ◽  
Vol 10 (06) ◽  
pp. 909-916 ◽  
Author(s):  
L. BURKHOLDER ◽  
D. STACCHIOLA ◽  
W. T. TYSOE
Keyword(s):  
Activation Energy ◽  
Infrared Spectroscopy ◽  
Temperature Programmed Desorption ◽  
Molecular Adsorption ◽  
Lateral Interactions ◽  
Ethylene Adsorption ◽  
Reflection Absorption Infrared Spectroscopy ◽  
Temperature Programmed ◽  
Ethane Formation ◽  
Reactive Properties

Several molecular adsorption states are identified following ethylene adsorption on clean and hydrogen-covered Pd(111) using temperature-programmed desorption (TPD) and reflection absorption infrared spectroscopy (RAIRS). Di-σ-bonded ethylene forms on clean Pd(111) desorbing with an activation energy of 80 kJ/mol at low coverages. The strong intermolecular lateral interactions considerably reduce the desorption temperature at higher coverages. Π-bonded ethylene is formed on hydrogen-covered Pd(111), where the proportion of π-bonded species increases with hydrogen coverage. This species converts to the more stable di-σ-bonded species on heating. Ethane formation is detected in TPD from hydrogen-precovered Pd(111), which is predominantly formed by reaction with π-bonded ethylene.

Propane and propane–water interactions: a study at cryogenic temperatures

2018 ◽  
Vol 20 (3) ◽  
pp. 1838-1847 ◽  
Author(s):  
Jyotirmoy Ghosh ◽  
Annapoorani Kobuvayur Hariharan ◽  
Radha Gobinda Bhuin ◽  
Rabin Rajan J. Methikkalam ◽  
Thalappil Pradeep
Keyword(s):  
Mass Spectrometry ◽  
Phase Transition ◽  
Infrared Spectroscopy ◽  
Ultrahigh Vacuum ◽  
Temperature Programmed Desorption ◽  
Water Mixture ◽  
Cryogenic Temperatures ◽  
Desorption Mass Spectrometry ◽  
Reflection Absorption Infrared Spectroscopy ◽  
Temperature Programmed

The phase transition of solid propane and a propane–water mixture under ultrahigh vacuum has been investigated using reflection absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption mass spectrometry (TPD-MS).

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