期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 18, 期 30, 页码 20168-20176出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp01790h
关键词
-
资金
- National Science Foundation [NSF-CHE-1362237, CHE-1255084]
- Austrian Science Fund FWF [P25827]
- Austrian Science Fund (FWF) [P 25827] Funding Source: researchfish
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1255084, 1362237] Funding Source: National Science Foundation
- Austrian Science Fund (FWF) [P25827] Funding Source: Austrian Science Fund (FWF)
The photodynamic properties of molecules determine their ability to survive in harsh radiation environments. As such, the photostability of heterocyclic aromatic compounds to electromagnetic radiation is expected to have been one of the selection pressures influencing the prebiotic chemistry on early Earth. In the present study, the gas-phase photodynamics of uracil, 5-methyluracil (thymine) and 2-thiouracil-three heterocyclic compounds thought to be present during this era-are assessed in the context of their recently proposed intersystem crossing pathways that compete with internal conversion to the ground state. Specifically, time-resolved photoelectron spectroscopy measurements evidence femtosecond to picosecond timescales for relaxation of the singlet (1)pi pi* and (1)n pi* states as well as for intersystem crossing to the triplet manifold. Trapping in the excited triplet state and intersystem crossing back to the ground state are investigated as potential factors contributing to the susceptibility of these molecules to ultraviolet photodamage.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据