H2O and HCl adsorption on single crystal α-Al2O3(0001) at stratospheric temperatures
作者： C.E. Nelson , J.W. Elam , M.A. Tolbert , S.M. George
DOI: 10.1016/S0169-4332(00)00536-5
关键词: Thermal desorption 、 Single crystal 、 Inorganic chemistry 、 Analytical chemistry 、 Saturation (chemistry) 、 Adsorption 、 Desorption 、 Chemistry 、 Aluminium oxide 、 Sticking coefficient 、 Thermal desorption spectroscopy
摘要: Abstract The adsorption of H2O and HCl on single crystal α-Al2O3(0001) at stratospheric temperatures was studied using laser-induced thermal desorption (LITD) temperature programmed (TPD) techniques. surface used to model Al2O3 exhaust particles from solid rocket motors. coverages may influence heterogeneous chemistry ∼200–270 K. Compared with earlier measurements 298–300 K, the saturation both were approximately two times higher 210 K. 210 K ΘH2O=4.4×1014 molecules/cm2 ΘHCl=2.0×1014 molecules/cm2. sticking coefficients for also than corresponding 298–300 K. (S) ∼0.08 lowest coverages. TPD spectra revealed that occurred over a broad range temperatures. These results indicate adsorb onto wide distribution binding sites surface. LITD predict α-Al2O3 will be covered chemisorbed under conditions. Additional exposure can replace adsorbed species, respectively, by exchange reactions.
harvard.edu
elsevier.com
sci-hub.se 参考文章(54)
I. L. Karol, E. V. Rozanov, Y. E. Ozolin, Effect of space rocket launches on ozone Annales Geophysicae. ,vol. 10, pp. 810- 814 ,(1992)
M. N. Ross, J. R. Benbrook, W. R. Sheldon, P. F. Zittel, D. L. McKenzie, Observation of stratospheric ozone depletion in rocket exhaust plumes Nature. ,vol. 390, pp. 62- 64 ,(1997) , 10.1038/36318
Ofer Sneh, Steven M. George, Sample manipulator employing a gas-thermal switch designed for high pressure experiments in an ultrahigh vacuum apparatus Journal of Vacuum Science and Technology. ,vol. 13, pp. 493- 496 ,(1995) , 10.1116/1.579386
M.A. Schildbach, A.V. Hamza, Clean and water-covered sapphire (11̄02) surfaces: structure and laser-induced desorption Surface Science. ,vol. 282, pp. 306- 322 ,(1993) , 10.1016/0039-6028(93)90936-E
J. G. Chen, J. E. Crowell, J. T. Yates, Assignment of a surface vibrational mode by chemical means: Modification of the lattice modes of Al2O3 by a surface reaction with H2O Journal of Chemical Physics. ,vol. 84, pp. 5906- 5909 ,(1986) , 10.1063/1.449902
Wesley R. Cofer, G.Garland Lala, James P. Wightman, Analysis of mid-tropospheric space shuttle exhausted aluminum oxide particles Atmospheric Environment. ,vol. 21, pp. 1187- 1196 ,(1987) , 10.1016/0004-6981(87)90246-0
Gary N. Robinson, Qing Dai, Andrew Freedman, Reactions of Halomethanes with γ-Alumina Surfaces. 2. X-ray Photoelectron and Temperature-Programmed Reaction Spectroscopic Studies Journal of Physical Chemistry B. ,vol. 101, pp. 4947- 4953 ,(1997) , 10.1021/JP963016D
B.G Frederick, G Apai, T.N Rhodin, Electronic and vibrational properties of hydroxylated and dehydroxylated thin Al2O2 films Surface Science. ,vol. 244, pp. 67- 80 ,(1991) , 10.1016/0039-6028(91)90170-W
A.C. Dillon, A.W. Ott, J.D. Way, S.M. George, Surface chemistry of Al2O3 deposition using Al(CH3)3 and H2O in a binary reaction sequence Surface Science. ,vol. 322, pp. 230- 242 ,(1995) , 10.1016/0039-6028(95)90033-0
Chuan C. Chang, Silicon-on-Sapphire Epitaxy by Vacuum Sublimation: LEED–Auger Studies and Electronic Properties of the Films Journal of Vacuum Science and Technology. ,vol. 8, pp. 500- 511 ,(1971) , 10.1116/1.1314585