Speaker
Description
As one of the building blocks of DNA, dAMP is vital for life as we know it. Previous studies have been performed that focused on the study of the breakup process of the molecule from CID [1] or from photofragmentation [2]. A spectrum of the relative fragmentation cross section of deprotonated dAMP was previously done [3] at room temperature. In our current work we have measured a spectrum of the deprotonated dAMP anion in a cryogenic 16 pole wire ion trap at a temperature below 4 K.
Our setup uses a custom-built nano-electro-spray ionization source. From the ion source the ions are guided towards and confined in a cryogenic 16-pole wire trap [4]. As proven in [5] through quadruple He tagging of protonated Glycine cations, our trap reaches exceptionally low temperatures, below 4 K, during operation. The content of the trap is mass separated using a Wiley-McLaren type reflectron time of flight spectrometer.
The used light source for this experiment was an Ekspla NT240 used to record the spectrum between 240 nm and 270 nm. In comparison to previous results we were able to observe previously unresolved structure in the spectrum. Furthermore, we measured the growth rates of fragments of the deprotonated dAMP as a function of the wavelength. Our results will be presented.
References
[1] D. Strzelecka, S. Chmielinski, S. Bednarek, J. Jemielity, J. Kowalska, Sci. Rep., 515, 441-451 (2018)
[2] S. S. Kumar, M. Pérot-Taillandier, B. Lucas, S. Soorkia, M. Barat, J. A. Fayeton, J. Phys. Chem. A, 115, 10383-10390 (2011)
[3] J. C. Marum, A. Halevi, J. M. Weber; Phys. Chem. Chem. Phys., 11, 1740-1751 (2009)
[4] K. Geistlinger, M. Fischer, S. Spieler, L. Remmers, F. Duensing, F. Dahlmann, E. Endres, R. Wester, Rev. Sci. Instrum. 92, 023204 (2021)
[5] K. Geistlinger, F. Dahlmann, T. Michaelsen, M. Ončák, E. Endres, R. Wester, J. Mol. Spectrosc., 379, 111479 (2021)
