Coulomb crystal mass spectrometry in a digital ion trap
Coulomb crystal mass spectrometry in a digital ion trap
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DOI：
10.1103/physreva.91.033408
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发表时间：
2015-03-24
影响因子：
2.9
通讯作者：
Softley, Timothy P.
中科院分区：
文献类型：
--
作者：
Deb, Nabanita;Pollum, Laura L.;Softley, Timothy P.
我们提出了一种质谱技术，用于识别的质量和相对丰度的库仑结晶离子举行的线性保罗陷阱。采用数字射频波形来产生捕获电势，因为这可以被干净地切断，并且随后将静态偶极场施加到用于离子喷射的捕获电极。由Ca+与CH_3F反应制备的双组分Ca ~+-CaF ~+库仑晶体对Ca ~+和CaF ~+离子的检测效率接近100%。观察到离子数与相应的积分飞行时间（TOF）峰之间的定量线性关系，与离子种类无关。该技术适用于各种多组分库仑晶体-这里证明为Ca+-NH 3 +-NH 4+和Ca+-CaOH+-CaOD+晶体-并将有助于测量复杂反应体系中的离子-分子反应速率和支化比。
We present a mass spectrometric technique for identifying the masses and relative abundances of Coulomb-crystallized ions held in a linear Paul trap. A digital radio-frequency wave form is employed to generate the trapping potential, as this can be cleanly switched off, and static dipolar fields are subsequently applied to the trap electrodes for ion ejection. Close to 100% detection efficiency is demonstrated for Ca+ and CaF+ ions from bicomponent Ca+-CaF+ Coulomb crystals prepared by the reaction of Ca+ with CH3F. A quantitative linear relationship is observed between ion number and the corresponding integrated time-of-flight (TOF) peak, independent of the ionic species. The technique is applicable to a diverse range of multicomponent Coulomb crystals-demonstrated here for Ca+-NH3+-NH4+ and Ca+-CaOH+-CaOD+ crystals-and will facilitate the measurement of ion-molecule reaction rates and branching ratios in complicated reaction systems.