Cavity Ring-Down Spectrometer for the Absorption Measurements of Molecular Ions

Abstract

The goal of this project was to develop an ion spectrometer capable of making absorption measurements on ions using cavity ring-down spectroscopy (CRDS). As part of our continuing goal of detecting ion products from ion-molecule reactions, we have successfully used CRDS to measure the vibronic absorption spectra of various small ions and radicals generated by a pulsed discharge nozzle. These spectra give information about the number densities and temperatures of the ions and radicals. Currently, our setup consists of a pulsed discharge nozzle that produces high concentrations of radicals and ions arranged perpendicular to the optical cavity made from two highly reflective mirrors. To date, we have obtained the absorption spectrum of N2(+) and CN as well as several atomic species.

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Document Details

Document Type
Technical Report
Publication Date
May 21, 2002
Accession Number
ADA402769

Entities

People

  • Richard Zare

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Absorption
  • Absorption Coefficients
  • Absorption Spectra
  • Computers
  • Detection
  • Dye Lasers
  • Instrumentation
  • Lasers
  • Liquid Dye Lasers
  • Measurement
  • Molecules
  • Optomechanics
  • Power Supplies
  • Scattering
  • Spectra
  • Spectrometers
  • Spectroscopy

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Materials Science and Engineering.
  • Optical Physics and Photonics.