SECONDARY ION EMISSION FROM SOLUTIONS - TIME-DEPENDENCE AND SURFACE PHENOMENA

被引:15
作者
KRIGER, MS
COOK, KD
SHORT, RT
TODD, PJ
机构
[1] UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996
[2] OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831
关键词
D O I
10.1021/ac00047a030
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The temporal behavior of FAB mass spectra from glycerol solutions of tetradecyltrimethylammonium bromide (C14H29N(CH3)3Br, TTAB) and tetraethylammonium iodide (TEAI) was investigated. FAB spectra of the TTAB solution displayed a continuous decrease in TTA+ with time. Spectra obtained from the TEAI solution were initially invariant for several minutes and then displayed a gradual increase in the relative abundance of TEA+ to a maximum, followed by a precipitous drop in ion intensity. Secondary ion images of droplets of TTAB solution showed that emission of both TTA+ and glycerol secondary ion images of droplets of TEAI solution showed heterogeneous and segregated emission of both TEA+ and protonated glycerol. Results from the FAB spectra and the secondary ion images were correlated and rationalized on the basis of surface tension induced mass transport and matrix evaporation.
引用
收藏
页码:3052 / 3058
页数:7
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