Excited States of Proton-bound DNA/RNA Base Homo-dimers: Pyrimidines

TL;DR

This study investigates the electronic spectra of proton-bound pyrimidine dimers, revealing that proton bonding influences vibrational structure and non-radiative processes, with thymine dimers showing distinct vibrational progressions.

Contribution

It provides new spectral data on protonated pyrimidine homo-dimers and demonstrates how proton bonding affects vibrational and non-radiative behaviors.

Findings

Thymine dimers show well-structured vibrational progressions.

Proton bonding can suppress non-radiative processes.

Protonated monomers exhibit broad vibrational bands.

Abstract

We are presenting the electronic photo fragment spectra of the protonated pyrimidine DNA bases homo-dimers. Only the thymine dimer exhibits a well structured vibrational progression, while protonated monomer shows broad vibrational bands. This shows that proton bonding can block some non radiative processes present in the monomer.