Structures of Protonated Thymine and Uracil and Their Monohydrated Gas-Phase Ions from Ultraviolet Action Spectroscopy and Theory

2014 ◽  
Vol 118 (24) ◽  
pp. 4256-4265 ◽  
Author(s):  
Sara Øvad Pedersen ◽  
Camilla Skinnerup Byskov ◽  
Frantisek Turecek ◽  
Steen Brøndsted Nielsen
Keyword(s):  
Gas Phase ◽  
Action Spectroscopy ◽  
Gas Phase Ions ◽  
Protonated Thymine

Infrared fluorescence relaxation of photoexcited gas‐phase ions by chopped‐laser two‐photon dissociation

1987 ◽  
Vol 86 (4) ◽  
pp. 2081-2086 ◽  
Author(s):  
Robert C. Dunbar ◽  
Jyh Horung Chen ◽  
Hun Young So ◽  
Bruce Asamoto
Keyword(s):  
Gas Phase ◽  
Two Photon ◽  
Gas Phase Ions

scholarly journals Electronic Spectroscopy of Isolated DNA Polyanions

2018 ◽  
Author(s):  
Steven Daly ◽  
Massimiliano Porrini ◽  
Frédéric Rosu ◽  
Valerie Gabelica
Keyword(s):  
Gas Phase ◽  
Absorption Spectra ◽  
Ion Mobility ◽  
Photoelectron Spectroscopy ◽  
Binding Energies ◽  
Action Spectroscopy ◽  
Action Spectra ◽  
Vis Spectroscopy ◽  
Electron Binding Energies ◽  
Electron Binding

In solution, UV-vis spectroscopy is often used to investigate structural changes in biomolecules (i.e., nucleic acids), owing to changes in the environment of their chromophores (i.e., the nucleobases). Here we address whether action spectroscopy could achieve the same for gas-phase ions, while taking the advantage of additional mass spectrometry and ion mobility separation of complex mixtures. We therefore systematically studied the action spectroscopy of homo-base 6-mer DNA strands (dG6, dA6, dC6, dT6), and discuss the results in light of gas-phase structures validated by ion mobility spectrometry and infrared ion spectroscopy, and in light of electron binding energies measured by photoelectron spectroscopy, and calculated electronic photo-absorption spectra. When UV photons interact with oligonucleotide polyanions, two main actions may take place: (1) fragmentation and (2) electron detachment. The action spectra reconstructed from fragmentation follow the absorption spectra well, and result from multiple cycles of absorption and internal conversion. The action spectra reconstructed from the electron photodetachment (EPD) efficiency reveal interesting phenomena: EPD depends on the charge state in a manner depending on electron binding energies, and is particularly efficient for purines but not pyrimidines. EPD thus reflects not only absorption, but also particular relaxation pathways of the electronic excited states. As these pathways lead to photo-oxidation, their investigation on model gas-phase systems may prove useful to elucidate mechanisms of photo-oxidative damages, which are linked to mutations and cancers.

scholarly journals Ultraviolet Action Spectroscopy of Iodine Labeled Peptides and Proteins in the Gas Phase

2012 ◽  
Vol 117 (6) ◽  
pp. 1228-1232 ◽  
Author(s):  
Benjamin B. Kirk ◽  
Adam J. Trevitt ◽  
Stephen J. Blanksby ◽  
Yuanqi Tao ◽  
Benjamin N. Moore ◽  
...  
Keyword(s):  
Gas Phase ◽  
Action Spectroscopy

Energetics and Structures of Gas Phase Ions: Macromolecules, Clusters and Ligated Transition Metals

1999 ◽  
pp. 235-258 ◽  
Author(s):  
Michael T. Bowers ◽  
Paul R. Kemper ◽  
Petra Koppen ◽  
Thomas Wyttenbach ◽  
Catherine J. Carpenter ◽  
...  
Keyword(s):  
Transition Metals ◽  
Gas Phase ◽  
Gas Phase Ions
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