...
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ion yields of thin MALDI samples: Dependence on matrix and metal substrate and implications for models
【24h】

Ion yields of thin MALDI samples: Dependence on matrix and metal substrate and implications for models

机译:薄MALDI样品的离子产率:取决于基质和金属基质及其对模型的影响

获取原文
获取原文并翻译 | 示例
           

摘要

Thin MALDI samples can perform differently than thicker samples, on metal substrates. Divergent results and models for the effect have been presented. Positive and negative yields are investigated here for three matrixes (2,5-dihydroxybenzoic acid (DHB), sinapinic acid, and alpha-cyano 4-hydroxycinnamic acid) on stainless steel and gold substrates. Samples were electrosprayed for uniformity and thickness control and imaged across a metal-metal boundary. Thin sample enhancement is found in both polarities for all three matrixes on a steel substrate. On gold, only alpha-cyano-4-hydroxycinnamic acid shows enhancement. These and earlier data are used to evaluate two models. The first is based on one-photon photoelectron emission from the metal; the second one, on two-photon matrix ionization at the metal interface. The surface-enhanced matrix photoionization model best fits the evidence, including the fluence dependence of electron emission from DHB on steel.
机译:薄的MALDI样品在金属基材上的表现可与厚的样品不同。提出了不同的结果和效果模型。在此研究了在不锈钢和金基底上的三种基质(2,5-二羟基苯甲酸(DHB),芥子酸和α-氰基4-羟基肉桂酸)的正和负产率。电喷雾样品以实现均匀性和厚度控制,并在金属-金属边界上成像。对于钢基材上的所有三个基质,在两个极性的样品中均发现了稀薄的样品增强。在金上,仅α-氰基-4-羟基肉桂酸显示出增强作用。这些数据和早期数据用于评估两个模型。第一种是基于金属的单光子光电子发射。第二个是在金属界面上的双光子基质电离。表面增强的基质光电离模型最适合于证据,包括DHB对钢的电子发射的注量依赖性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号