High-Resolution State-Selected Ion-Molecule Reaction Studies Using Pulsed Field Ionization Photoelectron-Secondary Ion Coincidence Method

Abstract

We have developed an octopole-quadrupole photoionization apparatus at the Advanced Light Source for absolute integral cross-section measurements of rovibrational-state-selected ion-molecule reactions. This apparatus consists of a high-resolution photoionization ion source, a wired ion gate lens, a dual radio-frequency (rf) octopole ion guide reaction gas cell, and a quadrupole mass spectrometer for reactant and product ion detection. The unique feature of this apparatus is the implementation of the high-resolution pulsed field ionization- photoelectron (PFI-PE)-photoion coincidence (PFI-PEPICO) technique, which has allowed the rotational-state selection of diatomic ions for ion-molecule reaction studies. The novel application of the wired ion gate lens for the rejection of false coincidence background ions is described. This application, along with the differential-ion-gate scheme, has made possible the measurements of rovibrational-state- selected absolute integral reaction cross sections for ion-molecule collisions using the PFI-PE-secondary ion coincidence (PFI-PESICO) method.

Document Details

• Document Type: Technical Report
• Publication Date: Sep 01, 2003
• Accession Number: ADA423289

Entities

People

• C. Y. Ng
• Chuan‐Chieh Chang
• Pingshan Wang
• Tianqing Zhang
• X. M. Qian

Organizations

• Air Force Research Laboratory

Tags

Communities of Interest

• Energy and Power Technologies

DTIC Thesaurus Topics

• Air Force Research Laboratories
• Charge Transfer
• Chemical Reactions
• Chemistry
• Collisions
• Detection
• Electrons
• Gas Cells
• High Resolution
• Ion Sources
• Ionization
• Light Sources
• Mass Spectrometers
• Measurement
• Photoelectrons
• Photoionization
• Spectrometers

Fields of Study

• Physics

Readers

• Molecular Photonics/Laser Physics
• Sensor Fusion and Tracking Systems.

Technology Areas

• Microelectronics