Nonlinear effects in desorption of valine with fast incident molecular ions.
Nonlinear effects in desorption of valine with fast incident molecular ions.
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快速入射分子离子对缬氨酸解吸的非线性影响。
DOI：
10.1103/physrevb.38.12320
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Hunt
中科院分区：
文献类型：
--
作者：
Salehpour;Fishel;Hunt
快分子离子作为初级粒子已被用来研究二次离子从有机层的解吸。二级分子离子产率的氨基酸缬氨酸（分子量，117）已被测量作为一个功能的初级原子和分子入射离子的速度。使用的主要离子是C/sup +/、O/sup +/、Ar/sup +/、C/sub 2//sup +/、O/sub 2//sup +/、CO/sup +/、CO/sub 2//sup +/、CH/sup +/、CH/sub 3//sup +/、CF/sup +/、CF/sub 3//sup +/、C/sub 3/F/sub 5//sup +/、和C/sub 4/F/sub 7//sup +/在600 keV-3.7 MeV的能量范围内。二次分子离子产率相比，原子成分的产率，毫不含糊地表明，集体效应存在于与入射分子离子解吸。结果进行了讨论的框架中的增强的电子阻止功率每原子的分子离子由于在材料中的快速移动的电荷的vicancies。由此产生的高产率的增强，特别是与使用大的入射离子，如C/sub 3/F/sub 5//sup +/和C/sub 4/F/sub 7//sup +/，是非常令人鼓舞的大有机分子质谱的未来。
Fast molecular ions as primary particles have been used to study secondary-ion desorption from organic layers. The secondary molecular-ion yield of the amino acid valine (molecular weight, 117) has been measured as a function of the velocity of primary atomic and molecular incident ions. The primary ions used were C/sup +/, O/sup +/, Ar/sup +/, C/sub 2//sup +/, O/sub 2//sup +/ , CO/sup +/, CO/sub 2//sup +/, CH/sup +/, CH/sub 3//sup +/, CF/sup +/, CF/sub 3//sup +/, C/sub 3/F/sub 5//sup +/, and C/sub 4/F/sub 7//sup +/ in the energy range 600 keV--3.7 MeV. The secondary molecular-ion yields, when compared to yields for atomic constituents, unambiguously show that collective effects exist in desorption with incident molecular ions. Results are discussed in the framework of enhancement in the electronic stopping power per atom for molecular ions due to the vicinage of the fast-moving charges in the material. The resulting high-yield enhancements, especially with the use of large incident ions such as C/sub 3/F/sub 5//sup +/ and C/sub 4/F/sub 7//sup +/, are very encouraging for the future of mass spectrometry of large organic molecules.