Strong Impact of an Axial Ligand on the Absorption by Chlorophyll a and b Pigments Determined by Gas-Phase Ion Spectroscopy Experiments

2016 ◽  
Vol 120 (47) ◽  
pp. 12105-12110 ◽  
Author(s):  
Christina Kjær ◽  
Mark H. Stockett ◽  
Bjarke M. Pedersen ◽  
Steen Brøndsted Nielsen
Keyword(s):  
Gas Phase ◽  
Chlorophyll A ◽  
Axial Ligand ◽  
Strong Impact ◽  
Ion Spectroscopy ◽  
Chlorophyll A And B ◽  
Gas Phase Ion

The Soret absorption band of isolated chlorophyll a and b tagged with quaternary ammonium ions

2015 ◽  
Vol 17 (39) ◽  
pp. 25793-25798 ◽  
Author(s):  
Mark H. Stockett ◽  
Lihi Musbat ◽  
Christina Kjær ◽  
Jørgen Houmøller ◽  
Yoni Toker ◽  
...  
Keyword(s):  
Absorption Band ◽  
Gas Phase ◽  
Ammonium Ions ◽  
Ion Spectroscopy ◽  
Quaternary Ammonium Ions ◽  
Td Dft ◽  
Chlorophyll A And B ◽  
Gas Phase Ion ◽  
True Colors ◽  
Soret Absorption

The true colors of chlorophyll a and b, isolated in vacuo, are revealed from a combination of gas-phase ion spectroscopy and TD-DFT calculations.

Gas-Phase Ion Spectroscopy of Congo Red Dianions and Their Complexes with Betaine

2018 ◽  
Vol 122 (12) ◽  
pp. 3211-3217 ◽  
Author(s):  
Christina Kjær ◽  
James M. Lisy ◽  
Steen Brøndsted Nielsen
Keyword(s):  
Gas Phase ◽  
Congo Red ◽  
Ion Spectroscopy ◽  
Gas Phase Ion

Color tuning of chlorophyll a and b pigments revealed from gas-phase spectroscopy

2020 ◽  
Vol 22 (36) ◽  
pp. 20331-20336
Author(s):  
Christina Kjær ◽  
Elisabeth Gruber ◽  
Steen Brøndsted Nielsen ◽  
Lars H. Andersen
Keyword(s):  
Gas Phase ◽  
Chlorophyll A ◽  
Electronic Transition ◽  
Light Harvesting ◽  
Color Tuning ◽  
Transition Energies ◽  
Axial Ligation ◽  
Chlorophyll A And B ◽  
Gas Phase Spectroscopy ◽  
Electronic Transition Energies

New perspectives of light harvesting: impacts of dimerization and axial ligation on electronic transition energies of chlorophylls in vacuo.

Reactivity Trends in the Gas Phase Addition of Acetylene to N-protonated Aryl Radical Cations

2020 ◽  
Author(s):  
Oisin Shiels ◽  
P. D. Kelly ◽  
Cameron C. Bright ◽  
Berwyck L. J. Poad ◽  
Stephen Blanksby ◽  
...  
Keyword(s):  
Gas Phase ◽  
Ion Trap ◽  
Radical Cations ◽  
Rate Coefficients ◽  
Similar Process ◽  
Ion Molecule Reactions ◽  
Aromatic Radicals ◽  
Polycyclic Aromatic ◽  
Gas Phase Ion ◽  
Type Radical

<div> <div> <div> <p>A key step in gas-phase polycyclic aromatic hydrocarbon (PAH) formation involves the addition of acetylene (or other alkyne) to σ-type aromatic radicals, with successive additions yielding more complex PAHs. A similar process can happen for N- containing aromatics. In cold diffuse environments, such as the interstellar medium, rates of radical addition may be enhanced when the σ-type radical is charged. This paper investigates the gas-phase ion-molecule reactions of acetylene with nine aromatic distonic σ-type radical cations derived from pyridinium (Pyr), anilinium (Anl) and benzonitrilium (Bzn) ions. Three isomers are studied in each case (radical sites at the ortho, meta and para positions). Using a room temperature ion trap, second-order rate coefficients, product branching ratios and reaction efficiencies are reported. </p> </div> </div> </div>

scholarly journals Triangular Rhodamine Triads and Their Intrinsic Photophysics Revealed from Gas‐Phase Ion Fluorescence Experiments

2021 ◽  
Author(s):  
Ying Zhao ◽  
Emma Rostal Sørensen ◽  
Thomas Toft Lindkvist ◽  
Christina Kjær ◽  
Mogens Brøndsted Nielsen ◽  
...  
Keyword(s):  
Gas Phase ◽  
Gas Phase Ion
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