2ND-HARMONIC GENERATION SPECTROSCOPY OF CINNAMIC ACID ADSORBED ON SILICA SURFACES

被引：9

作者：

WIJEKOON, WMKP

HO, ZZ

MULL, MW

PADMABANDU, GG

HETHERINGTON, WM

机构：

[1] Department of Chemistry, University of Arizona, Tucson

[2] Photonics Research Laboratory, Department of Chemistry, State University of New York at Buffalo, Buffalo

[3] Optical Sciences Center, University of Arizona, Tucson

[4] Computer Center, University of California at San Diego, San Diego

[5] Department of Physics, Texas A and M University, College Station

[6] Department of Physics, Oregon State University, Corvallis

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 25期

关键词：

D O I：

10.1021/j100204a061

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：

Surface second-harmonic generation has been used to obtain the electronic spectrum of trans-cinnamic acid adsorbed on optically polished silica surfaces under high-vacuum conditions at 296 K. The pattern of the second-order susceptibility tensor for the first electronic transition is calculated from the results of PPP calculations with double CI. The spectra are consistent with the existence of one or more hydrogen bonds between the cinnamic acid and the surface. There is no evidence of the creation of photochemical products under the illumination conditions. The competitive process of two-photon absorption leads to the desorption of weakly bound surface species. At least two different desorption rates were observed, and the ratio is interpreted in terms of a difference of 0.85 kcal mol-1 (0.03 eV) between two heats of adsorption.

引用

页码：10450 / 10453

页数：4

共 40 条

[1]

ANDERSON JH, 1955, J COLLOID INTERF SCI, V50, P519

[2]

BERNSTEIN GI, 1943, J AM CHEM SOC, V65, P1845

[3] STUDIES OF NEUTRAL AND CHARGED MOLECULES AT THE AIR WATER INTERFACE BY SURFACE 2ND HARMONIC-GENERATION - HYDROPHOBIC AND SOLVATION EFFECTS [J].