Measurements of negative ion densities by absorption spectroscopy

E. Quandt, H.F. Dobele, Bill Graham

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


A novel diagnostic technique for the measurement of negative ions is presented. The absorption of a cw-laser beam with a wavelength close to the maximum of the photodetachment cross section is measured. The laser beam undergoes multiple reflections through the discharge volume using a multipass cell there a Herriott arrangement). Proof-of-principle measurements of negative hydrogen ions in a hybrid volume source are presented. The measured H- density is in agreement with results of conventional, Langmuir probe-based photodetachment measurements. (C) 1998 American Institute of Physics. [S0003-6951(98)02119-6].
Original languageEnglish
Pages (from-to)2394-2396
Number of pages3
JournalApplied Physics Letters
Issue number19
Publication statusPublished - 1998

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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