Title :
Following Ultrafast Radiationless Relaxation Dynamics With Strong Field Dissociative Ionization: A Comparison Between Adenine, Uracil, and Cytosine
Author :
Kotur, Marija ; Weinacht, Thomas C. ; Zhou, Congyi ; Matsika, Spiridoula
Author_Institution :
Dept. of Phys. & Astron., Stony Brook Univ., Stony Brook, NY, USA
Abstract :
We present the application of ultrafast time- and mass-resolved ion yield laser spectroscopy in conjunction with ab initio electronic structure calculations to track molecular excited-state dynamics. We discuss how molecular fragment ions can be associated with conformations the molecule assumes during its relaxation, and how various features of the pump-probe signal for those fragments can be used to infer details of the excited-state dynamics. We present results for radiationless relaxation in DNA and RNA bases adenine, cytosine, and uracil in the gas phase, pumped near a one-photon resonance transition to an excited state, and probed via strong-field near-IR dissociative ionization.
Keywords :
ab initio calculations; excited states; high-speed optical techniques; macromolecules; molecular configurations; nonradiative transitions; photodissociation; photoionisation; DNA bases; RNA bases; ab initio electronic structure calculations; adenine; conformations; cytosine; mass-resolved ion yield laser spectroscopy; molecular excited-state dynamics; molecular fragment ions; one-photon resonance transition; pump-probe signal; strong field dissociative ionization; strong-field near-IR dissociative ionization; ultrafast radiationless relaxation dynamics; ultrafast time-resolved ion yield laser spectroscopy; uracil; Delay; Geometry; IP networks; Ionization; Optical variables measurement; Probes; Stationary state; Mass spectroscopy; optical pulses; photochemistry; ultrafast optics; ultraviolet sources;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2011.2107892
