Photodetachment from anions in a drift cell. Application to SF6- at 337 nm

Oddur Ingólfsson, Eugen Illenberger*, Werner F. Schmidt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A novel technique is introduced for the study of photodetachment from gas phase anions drifting in the electric field between two parallel electrodes. The anions are generated by attachment of photoelectrons to neutral molecules. The electrons are injected from the cathode by an excimer laser pulse. The transient molecular anions formed on free electron attachment are rapidly converted into their ground state by collisions with the buffer gas. Photodetachment from the drifting ground state anions is then effected by a second, delayed pulse from a nitrogen laser. The technique is applied to SF6- at 337 nm. Experiments concerning photodetachment from SF6- are scarce and rather conflicting. From the results available till now it is not clear whether or not photodetachment occurs for wavelengths λ ≥ 310 nm. We demonstrate here that SF6- in fact undergoes photodetachment at 337 nm with a cross-section on the 10-18 cm2 scale. The implications for the electronic and geometrical structure of SF6- are discussed.

Original languageEnglish
Pages (from-to)103-110
Number of pages8
JournalInternational Journal of Mass Spectrometry and Ion Processes
Volume139
Issue numberC
DOIs
Publication statusPublished - 24 Nov 1994

Other keywords

  • Ion drift experiment
  • Photodetachment
  • SF

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