Støchkel Kristian, Kadhane Umesh, Andersen Jens Ulrik, Holm Anne I S, Hvelplund Preben, Kirketerp Maj-Britt Suhr, Larsen Mikkel Koefoed, Lykkegaard Morten Køcks, Nielsen Steen Brøndsted, Panja Subhasis, Zettergren Henning
Institute for Storage Ring Facilities, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark.
Rev Sci Instrum. 2008 Feb;79(2 Pt 1):023107. doi: 10.1063/1.2884121.
A new method for time-resolved daughter ion mass spectrometry is presented, based on the electrostatic ion storage ring in Aarhus, ELISA. Ions with high internal energy, e.g., as a result of photoexcitation, dissociate and the yield of neutrals is monitored as a function of time. This gives information on lifetimes in the microsecond to millisecond time range but no information on the fragment masses. To determine the dissociation channels, we have introduced pulsed supplies with switching times of a few microseconds. This allows rapid switching from storage of parent ions to storage of daughter ions, which are dumped into a detector after a number of revolutions in the ring. A fragment mass spectrum is obtained by monitoring the daughter ion signal as a function of the ring voltages. This technique allows identification of the dissociation channels and determination of the time dependent competition between these channels.
本文介绍了一种基于奥胡斯的静电离子储存环（ELISA）的时间分辨子离子质谱新方法。具有高内能的离子，例如由于光激发产生的离子，会发生解离，并监测中性产物的产率随时间的变化。这提供了微秒到毫秒时间范围内的寿命信息，但没有关于碎片质量的信息。为了确定解离通道，我们引入了开关时间为几微秒的脉冲电源。这使得能够从母离子存储快速切换到子离子存储，子离子在环中经过多次旋转后被导入探测器。通过监测子离子信号随环电压的变化获得碎片质谱。该技术能够识别解离通道，并确定这些通道之间随时间变化的竞争情况。
