论文标题
含有C60和甲酸簇的氦液滴的电子连接和电子电离
Electron Attachment and Electron Ionization of Helium Droplets Containing Clusters of C60 and Formic Acid
论文作者
论文摘要
氦液滴的高分辨率质谱，用c $ _ {60} $和甲酸（FA）掺杂的高分辨率质谱是通过电子电离的。阳性离子质谱显示群集离子[（c $ _ {60} $）$ _ p $ fa $ _n $] $^+$以及它们的氢化和脱氢对应物。还观察到的是含有一个或多个水（W）分子的离子。这些离子的丰度分布揭示了几个有趣的功能：i）[（c $ _ {60} $）$ _ p $ fa $ _n $] $^+$ $^+$ ions比氢化[（c $ _ {60} $ _ p $ _ p $ _ p $ fa $ _n $ _n $ h] $ _n $ h] $^+$ ions I. $ p $ = 0）; ii）尽管[C $ _ {60} $ FA] $^+$是最丰富的离子，其中包含单个C $ _ {60} $，多c $ _ {60} $抑制[（c $ _ {60} $ _ p $ _ p $ fa] $ fa] $^+$信号; iii）增强的稳定性为[（c $ _ {60} $）$ _ p $ w $ _1 $ _1 $ fa $ _5 $ _5 $ h] $^+$和[（c $ _ {60} $） [w $ _2 $ fa $ _6 $ h] $^+$。另一方面，[C $ _ {60} $ fa $ _6 $ h] $^+$的增强稳定性在[FA $ _N $ H] $^+$或FA $ _N $$^+$的稳定性模式中没有平行。负离子质谱表明非解散的[（c $ _ {60} $）$ _ p $ fa $ _n $] $^ - $ anions如果$ p \ geq 1 $与脱水的主导地位[fa $ _n $ -h] $^ - $^ - $ nions。
High-resolution mass spectra of helium droplets doped with C$_{60}$ and formic acid (FA) are ionized by electrons. Positive ion mass spectra reveal cluster ions [(C$_{60}$)$_p$FA$_n$]$^+$ together with their hydrogenated and dehydrogenated counterparts. Also observed are ions containing one or more water (W) molecules. The abundance distributions of these ions reveal several interesting features: i) [(C$_{60}$)$_p$FA$_n$]$^+$ ions are more abundant than hydrogenated [(C$_{60}$)$_p$FA$_n$H]$^+$ ions even though the opposite is true in the absence of C$_{60}$ (i.e. if $p$ = 0); ii) although [C$_{60}$FA]$^+$ is the most abundant ion containing a single C$_{60}$, multiple C$_{60}$ suppress the [(C$_{60}$)$_p$FA]$^+$ signal; iii) an enhanced stability of [(C$_{60}$)$_p$W$_1$FA$_5$H]$^+$ and [(C$_{60}$)$_p$W$_2$FA$_6$H]$^+$ mirrors that of [W$_1$FA$_5$H]$^+$ and [W$_2$FA$_6$H]$^+$, respectively. On the other hand, the enhanced stability of [C$_{60}$FA$_6$H]$^+$ finds no parallel in the stability pattern of [FA$_n$H]$^+$ or FA$_n$$^+$. Negative ion mass spectra indicate a propensity for non-dissociated [(C$_{60}$)$_p$FA$_n$]$^-$ anions if $p \geq 1$ which contrasts with the dominance of dehydrogenated [FA$_n$-H]$^-$ anions.
