Spectroscopy of molecular ion beams
Abstract
The principles and techniques of molecular spectroscopy and mass spectrometry are reviewed. Many molecular ions may be identified by mass spectrometry, but the molecular ion beams formed in a mass spectrometer are not sufficiently intense for direct detection of the absorption of electromagnetic radiation so that absorption spectra must be obtained by laser sources and indirect methods of detection. Indirect detection methods which involve ion count and search for changes in ion beam intensity which occur when absorption of radiation produces changes in the internal state populations; the two-photon absorption, predissociation, the charge-exchange, and the ion-molecule reactions to detect spectroscopic transitions in an ion if the reaction cross sections of the parent and laser-excited ions are different are discussed. The electronic spectrum of CO(+) with charge-exchange detection, the detection of laser excitation through ion-molecule reactions, and possible developments involving infrared multi-photon dissociation of ion beams are described.
- Publication:
-
Proceedings of the Royal Society of London Series A
- Pub Date:
- September 1979
- DOI:
- 10.1098/rspa.1979.0097
- Bibcode:
- 1979RSPSA.367..433C
- Keywords:
-
- Atmospheric Chemistry;
- Ion Beams;
- Mass Spectroscopy;
- Molecular Gases;
- Molecular Ions;
- Molecular Spectroscopy;
- Absorption Spectra;
- Block Diagrams;
- Charge Exchange;
- Electromagnetic Radiation;
- Laser Applications;
- Line Spectra;
- Molecular Structure;
- Photon Beams;
- Refractivity;
- Vibrational Spectra;
- Instrumentation and Photography