Proton-induced single electron capture on DNA/RNA bases.

Area of Science:

• Atomic and Molecular Physics
• Chemical Physics
• Radiation Biology

Background:

• High-energy particle interactions with biological molecules are crucial for understanding radiation damage.
• DNA and RNA bases are primary targets for proton-induced damage.
• Accurate theoretical models are needed to interpret experimental findings.

Purpose of the Study:

• To calculate total cross sections for single electron capture by protons from DNA/RNA bases.
• To investigate the applicability of continuum distorted wave approximations for these interactions.
• To provide theoretical benchmarks for comparison with experimental data.

Main Methods:

• Utilizing continuum distorted wave (CDW) and continuum distorted wave-eikonal initial state (CDW-EIS) approximations.
• Employing self-consistent methods based on the complete neglect of differential overlap (CNDO) model for biological targets.
• Reducing the multi-electronic problem to a mono-electronic one via the independent electron approximation (IEA).

Main Results:

• Reported total cross sections for single electron capture from DNA/RNA bases by high-energy protons.
• Validated the CNDO model's accuracy using water vapor as a benchmark.
• Presented theoretical predictions for comparison with limited experimental data.

Conclusions:

• The study provides essential theoretical cross-section data for proton-induced single electron capture in DNA/RNA bases.
• The employed theoretical frameworks (CDW, CDW-EIS, CNDO, IEA) are suitable for investigating such complex molecular interactions.
• Further experimental validation is needed to confirm the theoretical predictions.