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首页> 外文期刊>Journal of physical chemistry letters >New Method for Double-Resonance Spectroscopy in a Cold Quadrupole Ion Trap and Its Application to UV-UV Hole-Burning Spectroscopy of Protonated Adenine Dimer
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New Method for Double-Resonance Spectroscopy in a Cold Quadrupole Ion Trap and Its Application to UV-UV Hole-Burning Spectroscopy of Protonated Adenine Dimer

机译：冷四极杆离子阱中双共振光谱的新方法及其在质子化腺嘌呤二聚体的UV-UV烧孔光谱中的应用

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摘要

A novel method for double-resonance spectroscopy in a cold quadrupole ion trap is presented, which utilizes dipolar resonant excitation of fragment ions in the quadrupole ion trap. Photofragments by a burn laser are removed by applying an auxiliary RF to the trap, and a probe laser detects the depletion of photofragments by the burn laser. By scanning the wavelength of the burn laser, conformation-specific UV spectrum of a cold ion is obtained. This simple and powerful method is applicable to any type of double- resonance spectroscopy in a cold quadrupole ion trap and was applied to UV-UV hole- burning spectroscopy of protonated adenine dimer. It was found that protonated adenine dimer has multiple conformers/tautomers, each with multiple excited states with drastically different excited state dynamics.
机译：提出了一种在冷四极离子阱中进行双共振光谱分析的新方法，该方法利用了四极离子阱中碎片离子的偶极共振激发。通过将辅助RF应用于陷阱，可以消除燃烧激光器产生的光碎片，而探测激光器可以检测出燃烧激光器产生的光碎片的消耗情况。通过扫描燃烧激光器的波长，可以获得冷离子的构象特异性UV光谱。这种简单而强大的方法适用于冷四极杆离子阱中的任何类型的双共振光谱，并且适用于质子化腺嘌呤二聚体的UV-UV孔燃烧光谱。已发现质子化的腺嘌呤二聚体具有多个构象异构体/互变异构体，每个具有多种激发态，其激发态动力学完全不同。

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