Irradiation-Induced Color Centers in Magnesium Fluoride

Blunt, R. F.; Cohen, M.I.

doi:10.1103/physrev.153.1031

Cited by 69 publications

(13 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As known from experiments with 60 Co, γ-rays, X-rays, electrons, neutrons and more recently also with low-energy ions [36,[38][39][40][41][42][43][44][45][46], the most dominant band with maximum optical absorption at 255-260 nm is due to the single F-centers.…”

Section: Introductionmentioning

confidence: 93%

See 1 more Smart Citation

Kinetics of dimer F type center annealing in MgF2 crystals

Kuzovkov

Kotomin

Попов

2018

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 93%

“…and GeV heavy ions [38][39][40][41][42][43][44][45]. Just as in the case of alkali halides and MgO and Al2O3, radiation defects in MgF2 can also be created without irradiation, namely, by additive coloration (TCR) [39].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of dimer F type center annealing in MgF2 crystals

Kuzovkov

Kotomin

Попов

2018

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

show abstract

“…In the past, extensive research activities were focused on the creation of color centers in MgF 2 crystals. [10][11][12] From this work, we know that many kinds of color centers can be generated in MgF 2 crystals, the most frequent ones being the F center which induces an absorption peak centered at ϭ250-260 nm and the M center located at ϭ370 nm. In order to clearly elucidate the kind of centers which are responsible for the absorption we found in our film, we have tried to fit our experimental curves using the model developed, for instance, by Dexter.…”

Section: Discussionmentioning

confidence: 99%

Optical and microstructural properties of MgF2 UV coatings grown by ion beam sputtering process

Quesnel

Dumas

Jacob

et al. 2000

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

View full text Add to dashboard Cite

The optical, mechanical, and microstructural properties of MgF 2 single layers grown by ion beam sputtering have been investigated by spectrophotometric measurements, film stress characterization, x-ray photoelectron spectroscopy ͑XPS͒, x-ray diffraction, and transmission electron microscopy. The deposition conditions, using fluorine reactive gas or not, have been found to greatly influence the optical absorption and the stress of the films as well as their microstructure. The layers grown with fluorine compensation exhibit a regular columnar microstructure and an UV-optical absorption which can be very low, either as deposited or after thermal annealings at very low temperatures. On the contrary, layers grown without fluorine compensation exhibit a less regular microstructure and a high ultraviolet absorption which is particularly hard to cure. On the basis of calculations, it is shown that F centers are responsible for this absorption, whereas all the films were found to be stoichiometric, in the limit of the XPS sensitivity. On the basis of external data taken from literature, our experimental curves are analyzed, so we propose possible diffusion mechanisms which could explain the behaviors of the coatings.

show abstract

“…The lifetime is limited because the transmittance of the magnesium fluoride window in the VUV spectral region decreases with run-time 8,11 . The degeneration might be explained by several effects like formation of color centers (F-center) [16][17][18] or adsorption of water, molecular oxygen, methane or non-methane hydrocarbons at the surface or the bulk of the magnesium fluoride window 19,20 . We focused on the reduction of the last mentioned pollutions inside the lamp successfully increasing the lifetime by using resilient metal seals and continuously purifying the krypton gas.…”

Section: Vuv Lamp Designmentioning

confidence: 99%

A novel vacuum ultra violet lamp for metastable rare gas experiments

Daerr

Kohler

Sahling³

et al. 2011

Review of Scientific Instruments

View full text Add to dashboard Cite

We report on a new design of a vacuum ultra violet (VUV) lamp for direct optical excitation of high laying atomic states e.g. for excitation of metastable rare gas atoms. The lamp can be directly mounted to ultra high vacuum vessels (p ≤ 10 −10 mbar). It is driven by a 2.45 GHz microwave source. For optimum operation it requires powers of approximately 20 W. The VUV light is transmitted through a magnesium fluoride window, which is known to have a decreasing transmittance for VUV photons with time. In our special setup, after a run-time of the VUV lamp of 550 h the detected signal continuously decreased to 25 % of its initial value. This corresponds to a lifetime increase of two orders of magnitude compared to previous setups or commercial lamps.

show abstract

Irradiation-Induced Color Centers in Magnesium Fluoride

Cited by 69 publications

References 8 publications

Kinetics of dimer F type center annealing in MgF2 crystals

Kinetics of dimer F type center annealing in MgF2 crystals

Optical and microstructural properties of MgF2 UV coatings grown by ion beam sputtering process

A novel vacuum ultra violet lamp for metastable rare gas experiments

Contact Info

Product

Resources

About