NEW METHOD FOR DETERMINATION OF SURFACE PK(A) USING 2ND-HARMONIC GENERATION

被引：139

作者：

ZHAO, XL ^{[1
]}

ONG, SW ^{[1
]}

WANG, HF ^{[1
]}

EISENTHAL, KB ^{[1
]}

机构：

[1] COLUMBIA UNIV,DEPT CHEM,NEW YORK,NY 10027

来源：

CHEMICAL PHYSICS LETTERS | 1993年 / 214卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0009-2614(93)90082-C

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：

A new method to determine the pK(a) of chemical species at aqueous insulating interfaces is based on the discovery that the interface potential is linearly proportional to the measured second harmonic electric field. The proportionality constant is the effective third-order susceptibility and is the same for all aqueous interfaces studied, which has its origin in the polarization of bulk water induced by the charged form of the acid or base at the interface. We have determined that CH3(CH2)21NH3+ at the air/water interface has a pK(a) of 9.9 +/- 0.2 versus 10.6 in bulk water.

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页码：203 / 207

页数：5

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