M�ssbauer conversion electron studies of tantalum metal surface layers

Salomon, D.; West, Peter J.; Meyer, Gerhard

doi:10.1007/bf01021678

Cited by 16 publications

(4 citation statements)

References 8 publications

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“…Therefore the (1) 18.9(3) 25(1) 26 (1) Table 1) can be considered to be independent of absorber thickness [-21]. This dispersion parameter is also consistent with the values obtained from conversion electron studies of tantalum metal surface layers [7]. In the case of the split source the inhomogeneous magnetic field of the permanent magnet at the position of the source is responsible for the line broadening only.…”

Section: Resultsmentioning

confidence: 54%

“…The source was prepared in the same fashion as before [7], with diffusion at 2500~ but for a shorter duration of 15min. The absorber was rolled down to 4.8 mg/cm 2 from a Ta foil (Metal Research Company, USA, 99.99 +purity, 0.5mil) and finally outgassed at 2400~ and 10 -l~ Torr.…”

Section: Experimentallymentioning

confidence: 99%

“…Here we restrict ourselves to the Pauli paramagnetic transition metals such as W and Ta. One of the main problem of the Ta nuclear gamma resonance (NGR) is the experimentally broadened linewidth [7]. Therefore the first magnetically split spectra of 181Ta [8,93 were poorly resolved.…”

Section: Introductionmentioning

confidence: 99%

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Observation of knight shifts in metallic tungsten and tantalum with the 6.2 keV181Ta M�ssbauer resonance

Salomon

West

1978

Z Physik A

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Completely resolved M6ssbauer spectra for the 6.2keV ~S~Ta transition were measured at R.T. in external magnetic field of 2.8 and 4.4kOe for ~8~Ta impurities in W-and Tametal respectively. A more precise mean value for the g-factor ratio gg/2/g7/2 of 1.797 (3) was obtained. The magnetic moment of the 6.2 keV-state was determined to be + 5.47 (2) n.m. From the hyperfine fields at the 181Ta-nuclei in W a Knight-shift of 2(1)% and in Ta of 1.7(8)% was deduced. For the spectrum of the magnetically splitted Ta-metal absorber a reduced dispersion parameter of 2 ~ = 20 (2) was measured, while the linewidth showed only a slight narrowing.

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Section: Resultsmentioning

confidence: 54%

Section: Experimentallymentioning

confidence: 99%

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Observation of knight shifts in metallic tungsten and tantalum with the 6.2 keV181Ta M�ssbauer resonance

Salomon

West

1978

Z Physik A

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“…If scattered conversion electrons are counted, Mossbauer spectroscopy becomes a technique to study solid surfaces. In addition to the more common iron and tin isotopes, this technique was recently applied by Salomon et al (272) to the study of tantalum metal surfaces using 181Ta. Foils had broader lines than single crystals due to adsorbed gas.…”

Section: Catalysts and Surfacesmentioning

confidence: 99%