Design and Application of a High-Temperature Linear Ion Trap Reactor

Area of Science:

• Physical Chemistry
• Chemical Physics
• Gas-Phase Ion Chemistry

Background:

• Studying ion-molecule reactions at elevated temperatures is crucial for understanding chemical processes in various environments.
• Existing experimental setups often lack the capability to reach the high temperatures required for certain reaction dynamics.

Purpose of the Study:

• To design and construct a novel high-temperature linear ion trap reactor capable of operating up to 773 K.
• To investigate the performance of this reactor by studying the temperature-dependent kinetics of the V2O6- cluster anion and CO reaction.
• To determine the apparent activation energy for this reaction and compare it with theoretical calculations.

Main Methods:

• Construction of a homemade high-temperature linear ion trap reactor utilizing a hexapole design.
• Experimental investigation of the ion-molecule reaction between V2O6- cluster anions and carbon monoxide (CO) across a range of temperatures.
• Determination of apparent activation energy from experimental kinetic data.
• Comparison of experimental results with density functional theory (DFT) calculations.

Main Results:

• The homemade reactor achieved ion temperatures up to 773 K, surpassing existing capabilities.
• The reaction between V2O6- and CO was successfully studied at variable temperatures.
• The apparent activation energy was determined to be 0.10 ± 0.02 eV.
• Experimental results showed good agreement with DFT-calculated activation barriers (0.12 eV).

Conclusions:

• The developed high-temperature linear ion trap reactor is a promising apparatus for studying ion-molecule reactions at variable temperatures.
• The reactor enables the acquisition of detailed kinetic information for reactions with significant energy barriers.
• This work provides a foundation for further investigations into gas-phase ion chemistry at elevated temperatures.