CHEMISORPTION AND MACROSCOPIC DIFFUSION OF NO ON PT(111)

被引：14

作者：

CROCI, M ^{[1
]}

FELIX, C ^{[1
]}

VANDONI, G ^{[1
]}

HARBICH, W ^{[1
]}

MONOT, R ^{[1
]}

机构：

[1] ECOLE POLYTECH FED LAUSANNE, INST PHYS EXPTL, CH-1015 LAUSANNE, SWITZERLAND

来源：

SURFACE SCIENCE | 1994年 / 307卷

关键词：

D O I：

10.1016/0039-6028(94)90437-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Thermal energy helium scattering is used to measure the isothermal desorption of NO from Pt(111) in the temperature range 343-383 K. Taking into account the vibrational degrees of freedom to calculate the residence time of the molecules, the energy of adsorption is E(a) = -29.8 +/- 1 kcal/mol, and a repulsive interaction energy between molecules is found: phi = 6.1 +/- 1 kcal/mol. Also, the macroscopic diffusion of NO on Pt(111) is measured for the first time between 313 and 358 K. The technique uses a helium beam to monitor the time dependence of the coverage on a well defined surface spot, when the adsorbed molecules diffuse outside this spot. The activation energy for diffusion at low coverage is E(D) = 11.8 +/- 1.2 kcal/mol, and the pre-exponential factor is D0 = 2.4 x 10(-3) m2/s.

引用

页码：460 / 464

页数：5

共 28 条

[1] AN INFRARED STUDY OF NO ADSORPTION AT DEFECT SITES ON PT(111)
AGRAWAL, VK
TRENARY, M
[J]. SURFACE SCIENCE, 1991, 259 (1-2) : 116 - 128
[2] DESORPTION BY ELECTRONICALLY STIMULATED ADSORBATE ROTATION
BURNS, AR
STECHEL, EB
JENNISON, DR
[J]. PHYSICAL REVIEW LETTERS, 1987, 58 (03) : 250 - 253
[3] MOLECULAR-BEAM EXPERIMENT FOR ADSORPTION-KINETICS AND CATALYTIC REACTIONS STUDIES
CALPINI, B
CROCI, M
DAVID, R
MONOT, R
[J]. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, 1992, 10 (05): : 3221 - 3228
[4] A MOLECULAR-BEAM STUDY ON THE INTERACTION OF NO WITH A PT(111) SURFACE
CAMPBELL, CT
ERTL, G
SEGNER, J
[J]. SURFACE SCIENCE, 1982, 115 (02) : 309 - 322
[5] CROCI M, 1993, SURF SCI, V290, pL667, DOI 10.1016/0039-6028(93)90577-7
[6] CROCI M, 1992, THESIS LAUSANNE
[7] FOWLER RH, 1955, STATISTICAL MECHANIC
[8] GEORGE SM, 1985, SURF SCI, V159, pL425, DOI 10.1016/0039-6028(85)90097-4
[9] NITRIC-OXIDE ADSORPTION ON THE PT(111) SURFACE
GLAND, JL
SEXTON, BA
[J]. SURFACE SCIENCE, 1980, 94 (2-3) : 355 - 368
[10] AN INFRARED REFLECTION ABSORPTION STUDY OF THE ADSORPTION OF NO ON PT(111)
HAYDEN, BE
[J]. SURFACE SCIENCE, 1983, 131 (2-3) : 419 - 432

← 1 2 3 →