scholarly journals Action-spectroscopy studies of positively charge-tagged azobenzene in solution and in the gas-phase

2019 ◽  
Vol 150 (8) ◽  
pp. 084303 ◽  
Author(s):  
Elisabeth Gruber ◽  
Marcel A. Strauss ◽  
Hermann A. Wegner ◽  
Lars H. Andersen
Keyword(s):  
Gas Phase ◽  
Action Spectroscopy ◽  
Spectroscopy Studies

scholarly journals Photofragment Translational Spectroscopy Studies of H Atom Loss Following Ultraviolet Photoexcitation of Methimazole in the Gas Phase

2018 ◽  
Vol 122 (51) ◽  
pp. 9869-9878 ◽  
Author(s):  
Graham A. Cooper ◽  
Christopher S. Hansen ◽  
Tolga N. V. Karsili ◽  
Michael N. R. Ashfold
Keyword(s):  
Gas Phase ◽  
Atom Loss ◽  
Spectroscopy Studies

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

Charge‐Tagged DNA Radicals in the Gas Phase Characterized by UV/Vis Photodissociation Action Spectroscopy

2020 ◽  
Vol 132 (20) ◽  
pp. 7846-7851
Author(s):  
Yue Liu ◽  
Andy Dang ◽  
Jan Urban ◽  
František Tureček
Keyword(s):  
Gas Phase ◽  
Action Spectroscopy ◽  
Dna Radicals

scholarly journals Action spectroscopy of spin forbidden states in the gas phase: A powerful probe for large non-luminescent molecules

2020 ◽  
Vol 152 (14) ◽  
pp. 144306
Author(s):  
F. Grollau ◽  
C. Pothier ◽  
M. A. Gaveau ◽  
M. Briant ◽  
N. Shafizadeh ◽  
...  
Keyword(s):  
Gas Phase ◽  
Forbidden States ◽  
Action Spectroscopy

scholarly journals IR action spectroscopy shows competitive oxazolone and diketopiperazine formation in peptides depends on peptide length and identity of terminal residue in the departing fragment

The Analyst ◽  
2014 ◽  
Vol 139 (9) ◽  
pp. 2137-2143 ◽  
Author(s):  
L. J. Morrison ◽  
J. Chamot-Rooke ◽  
V. H. Wysocki
Keyword(s):  
Gas Phase ◽  
Side Chain ◽  
Action Spectroscopy ◽  
Terminal Residue ◽  
The Third ◽  
Diketopiperazine Formation ◽  
Peptide Length

Diketopiperazine formation in gas-phase peptides depends on the side-chain of the third residue.

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