Picosecond vs Femtosecond: Are All Laser Desorption Ionizations Created Equal?

Picosecond vs Femtosecond: Are All Laser Desorption Ionizations Created Equal?
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皮秒与飞秒:所有激光解吸电离作用都相同吗?

DOI:
10.1021/acs.jpcc.2c06573
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发表时间:
2022
期刊:
The Journal of Physical Chemistry C
影响因子:
--
通讯作者:
Li, Wen
Li, Wen
中科院分区:
--
文献类型:
--
作者:
Stewart, Gabriel A.;Debrah, Duke;Ranathunga, Yasashri;Olowolafe, Temitayo A.;Schlegel, H. Bernhard;Lee, Suk Kyoung;Li, Wen

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利用三维动量成像技术,研究了啁啾皮秒和飞秒脉冲激发的激光解吸电离动力学。首次获得了常用激光解吸基质2,5-二羟基苯甲酸(DHB)解吸离子的三维动量图像。观察到飞秒和皮秒脉冲引发的过程之间的显着差异。飞秒脉冲产生的离子中初始动量的缺乏表明羽流形成的抑制,这可以被利用来增加基质辅助激光解吸电离的灵敏度。
With a three-dimensional (3D) momentum imaging technique, we investigated the laser desorption ionization dynamics initiated by both chirped picosecond and femtosecond pulses. 3D momentum images of desorbed ions from 2,5-dihydroxybenzoic acid (DHB), a common laser desorption matrix, were obtained for the first time. A striking difference was observed between the processes initiated by femtosecond and picosecond pulses. The lack of initial momentum in ions produced by femtosecond pulses suggests a suppression of plume formation, which can be exploited to increase the sensitivity of matrix-assisted laser desorption ionization.
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