Sulfur and nitrogen reactions for cometary comae ion chemistry

Area of Science:

• Astrochemistry
• Planetary Science
• Chemical Kinetics

Background:

• Cometary comae exhibit complex sulfur chemistry.
• The role of water ions in cometary chemical processes is not fully understood.
• Sulfur-bearing species are significant components of cometary atmospheres.

Purpose of the Study:

• To investigate the low-pressure reactions of sulfur dioxide, carbon disulfide, and hydrazine with water ions (H2O+ and H3O+).
• To determine the significance of these reactions for sulfur chemistry in cometary comae.
• To quantify reaction rate coefficients and product channel branching ratios.

Main Methods:

• Utilized the ion cyclotron resonance technique to study gas-phase ion-molecule reactions.
• Controlled low-pressure conditions to simulate aspects of cometary environments.
• Analyzed reaction products to determine branching ratios.

Main Results:

• Presented rate coefficients for the reactions of sulfur dioxide, carbon disulfide, and hydrazine with H2O+ and H3O+.
• Quantified the branching ratios for various product channels.
• Identified key reaction pathways relevant to cometary sulfur chemistry.

Conclusions:

• The studied reactions are potentially significant for sulfur cycling in cometary comae.
• The data provides essential kinetic information for astrochemical models of comets.
• Further research can refine our understanding of cometary chemical evolution.