Abstract

Alkali halides such as calcium fluoride all have color center defects that absorb light in the visible region. Using a moncochromator equipped, aberration corrected, scanning transmission electron microscope (STEM) we recorded spectra showing the time evolution of the generation of F and H centers in calcium fluoride. The final stage of electron beam irradiation is the formation of metallic calcium nanoparticles. High resolution low loss spectra for the Vacuum Ultraviolet region were also recorded.

Original languageEnglish (US)
Pages (from-to)40-44
Number of pages5
JournalUltramicroscopy
Volume153
DOIs
StatePublished - Jun 1 2015

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Calcium Fluoride
Calcium fluoride
calcium fluorides
Color centers
color centers
Alkali halides
alkali halides
Aberrations
aberration
calcium
Calcium
Electron beams
Electron microscopes
electron microscopes
Irradiation
Vacuum
electron beams
Nanoparticles
Scanning
nanoparticles

Keywords

  • Calcium fluoride
  • Color center
  • EELS
  • Excitons
  • Fluorite
  • Low loss spectra
  • Monochromator
  • Radiation damage

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electronic, Optical and Magnetic Materials

Cite this

Observation of color center peaks in calcium fluoride. / Aoki, T.; Garvie, Laurence; Rez, Peter.

In: Ultramicroscopy, Vol. 153, 01.06.2015, p. 40-44.

Research output: Contribution to journalArticle

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author = "T. Aoki and Laurence Garvie and Peter Rez",
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AU - Rez, Peter

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AB - Alkali halides such as calcium fluoride all have color center defects that absorb light in the visible region. Using a moncochromator equipped, aberration corrected, scanning transmission electron microscope (STEM) we recorded spectra showing the time evolution of the generation of F and H centers in calcium fluoride. The final stage of electron beam irradiation is the formation of metallic calcium nanoparticles. High resolution low loss spectra for the Vacuum Ultraviolet region were also recorded.

KW - Calcium fluoride

KW - Color center

KW - EELS

KW - Excitons

KW - Fluorite

KW - Low loss spectra

KW - Monochromator

KW - Radiation damage

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