Observation of dissociative quasi-free electron attachment to nucleoside via excited anion radical in solution.

ABSTRACT: Damage to DNA via dissociative electron attachment has been well-studied in both the gas and condensed phases; however, understanding this process in bulk solution at a fundamental level is still a challenge. Here, we use a picosecond pulse of a high energy electron beam to generate electrons in liquid diethylene glycol and observe the electron attachment dynamics to ribothymidine at different stages of electron relaxation. Our transient spectroscopic results reveal that the quasi-free electron with energy near the conduction band effectively attaches to ribothymidine leading to a new absorbing species that is characterized in the UV-visible region. This species exhibits a nearly concentration-independent decay with a time constant of ~350 ps. From time-resolved studies under different con

SUBMITTER: Ma J 

PROVIDER: S-EPMC6327028 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature