Infrared laser dissociation of single megadalton polymer ions in a gated electrostatic ion trap: the added value of statistical analysis of individual events†‡,Physical Chemistry Chemical Physics

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Infrared laser dissociation of single megadalton polymer ions in a gated electrostatic ion trap: the added value of statistical analysis of individual events†‡
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-04-12 00:00:00 , DOI: 10.1039/c8cp00404h
Mohammad A. Halim _{1,

2,

3,

4,

5} , Christian Clavier _{1,

2,

3,

4,

5} , Xavier Dagany _{1,

2,

3,

4,

5} , Michel Kerleroux _{1,

2,

3,

4,

5} , Philippe Dugourd _{1,

2,

3,

4,

5} , Robert C. Dunbar _{6,

7,

8,

9} , Rodolphe Antoine _{1,

2,

3,

4,

5}

Affiliation

In this study, we report the unimolecular dissociation mechanism of megadalton SO₃-containing poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) polymer cations and anions with the aid of infrared multiphoton dissociation coupled to charge detection ion trap mass spectrometry. A gated electrostatic ion trap (“Benner trap”) is used to store and detect single gaseous polymer ions generated by positive and negative polarity in an electrospray ionization source. The trapped ions are then fragmented due to the sequential absorption of multiple infrared photons produced from a continuous-wave CO₂ laser. Several fragmentation pathways having distinct signatures are observed. Highly charged parent ions characteristically adopt a distinctive “stair-case” pattern (assigned to the “fission” process) whereas low charge species take on a “funnel like” shape (assigned to the “evaporation” process). Also, the log–log plot of the dissociation rate constants as a function of laser intensity between PAMPS positive and negative ions is significantly different.

中文翻译：

门控静电离子阱中单个兆dalton聚合物离子的红外激光解离：单个事件统计分析的附加值† ‡

在这项研究中，我们报告了借助红外多光子离解与电荷检测离子结合的方法，对包含兆达尔顿SO ₃的聚（2-丙烯酰胺基-2-甲基-1-丙烷磺酸）（PAMPS）聚合物阳离子和阴离子的单分子解离机理进行了研究。阱质谱。门控静电离子阱（“ Benner阱”）用于存储和检测在电喷雾电离源中由正极性和负极性生成的单一气态聚合物离子。然后，由于连续波CO ₂产生的多个红外光子的顺序吸收，被捕获的离子会碎裂激光。观察到具有不同特征的几种断裂途径。高电荷母离子通常采用独特的“阶梯状”模式（分配给“裂变”过程），而低电荷物质呈“漏斗状”形状（分配给“蒸发”过程）。同样，解离速率常数与PAMPS正离子和负离子之间的激光强度的对数-对数图也有显着差异。

更新日期：2018-04-12

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