Electron Binding in a Superatom with a Repulsive Coulomb Barrier: The Case of [Ag44(SC6H3F2)30]4– in the Gas Phase

2020 ◽  
Vol 11 (8) ◽  
pp. 3069-3074 ◽  
Author(s):  
Yuriko Tasaka ◽  
Katsunosuke Nakamura ◽  
Sami Malola ◽  
Keisuke Hirata ◽  
Kuenhee Kim ◽  
...  
Keyword(s):  
Gas Phase ◽  
Coulomb Barrier ◽  
Repulsive Coulomb ◽  
Electron Binding

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.

Trapping a Photoelectron behind a Repulsive Coulomb Barrier in Solution

2019 ◽  
Vol 10 (19) ◽  
pp. 5742-5747 ◽  
Author(s):  
Meixin Cheng ◽  
Nicolás Rivas ◽  
Su Ji Lim ◽  
Kostyantyn Pichugin ◽  
Ariel A. Petruk ◽  
...  
Keyword(s):  
Coulomb Barrier ◽  
Repulsive Coulomb

scholarly journals Excited states of multiply-charged anions probed by photoelectron imaging: riding the repulsive Coulomb barrier

2014 ◽  
Vol 16 (29) ◽  
pp. 15043-15052 ◽  
Author(s):  
Jan R. R. Verlet ◽  
Daniel A. Horke ◽  
Adam S. Chatterley
Keyword(s):  
Excited States ◽  
Photoelectron Spectroscopy ◽  
Coulomb Barrier ◽  
Recent Progress ◽  
Photoelectron Imaging ◽  
Multiply Charged ◽  
Repulsive Coulomb

Recent progress towards understanding the repulsive Coulomb barrier in multiply-charged anion using photoelectron spectroscopy is discussed.

scholarly journals Resonant tunneling through the repulsive Coulomb barrier of a quadruply charged molecular anion

2012 ◽  
Vol 85 (6) ◽  
Author(s):  
Phuong Diem Dau ◽  
Hong-Tao Liu ◽  
Ji-Ping Yang ◽  
Marc-Oliver Winghart ◽  
Thomas J. A. Wolf ◽  
...  
Keyword(s):  
Coulomb Barrier ◽  
Resonant Tunneling ◽  
Molecular Anion ◽  
Repulsive Coulomb
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