Mössbauer effect determination of relative recoilless fractions for iron oxides

1999 ◽  
Vol 85 (1) ◽  
pp. 329-332 ◽  
Author(s):  
Sei J. Oh ◽  
D. C. Cook
Keyword(s):  
Iron Oxides ◽  
Mössbauer Effect ◽  
Mossbauer Effect

THE POSSIBILITY OF USING THE MÖSSBAUER EFFECT TO MEASURE CROSS RELAXATION OF 57Co COUPLED TO AN UNPAIRED ELECTRON SPIN

1965 ◽  
Vol 43 (10) ◽  
pp. 1843-1852 ◽  
Author(s):  
Sushil K. Misra ◽  
J. M. Daniels
Keyword(s):  
Emission Line ◽  
Absorption Line ◽  
Unpaired Electron ◽  
Mössbauer Effect ◽  
Numerical Evaluation ◽  
Nuclear Orientation ◽  
Mossbauer Effect ◽  
Flip Flop ◽  
Overhauser Effect

A parameter R(v), relevant to velocity-sensitive Mössbauer spectroscopy, has been computed for the case where the orientation of 57Co nuclei is produced dynamically by the Overhauser effect. This particular pumping scheme for producing nuclear orientation brings out two features. (1) It allows the determination of η, the ratio of flip-flop to flip-flip thermal relaxations, by an experimental measurement of R(v), since the theoretical expressions for R(v) are found to be quite sensitive to the value of η. A numerical evaluation for three cases of overlap between absorber and emitter lines indicates wide variation in R(v) for increasing values of η from 10−7 to 107: for case (a), R(v) increases monotonically from 8.5 × 10−7 to 1.07 × 106 when emission line 3/2 → 1/2 overlaps absorption line −1/2 → −3/2; for case (b), R(v) decreases monotonically from 1.34 × 1014 to 8.91 × 10−5 when emission line −1/2 → 1/2 overlaps absorption line −1/2 → 1/2; and for case (c), R(v) decreases monotonically from 1.62 × 102 to 6.14 × 10−3 when source lines −1/2 → −1/2, 1/2 → −1/2, 1/2 → 1/2, and 3/2 → 1/2 overlap absorber lines −1/2 → −3/2, −1/2 → 1/2, 1/2 → −1/2, and 1/2 → 1/2 respectively. (2) Since these R(v)'s are found to be much different from those that would be achieved through a pumping scheme using the Jeffries–Abragam effect, the possibility of using the Mössbauer effect to distinguish between the various ways of producing the nuclear orientation is suggested.

MÖSSBAUER EFFECT AND MAGNETIC STUDIES OF SECONDARY IRON OXIDES IN SOILS

1979 ◽  
Vol 30 (1) ◽  
pp. 93-110 ◽  
Author(s):  
G. LONGWORTH ◽  
L. W. BECKER ◽  
R. THOMPSON ◽  
F. OLDFIELD ◽  
J. A. DEARING ◽  
...  
Keyword(s):  
Iron Oxides ◽  
Mössbauer Effect ◽  
Mossbauer Effect ◽  
Magnetic Studies

Determination of the Cation Distribution in the Orthopyroxene Series by the Mossbauer Effect

Nature ◽  
1967 ◽  
Vol 213 (5082) ◽  
pp. 1221-1223 ◽  
Author(s):  
G. MICHAEL BANCROFT ◽  
ROGER G. BURNS ◽  
R. A. HOWIE
Keyword(s):  
Cation Distribution ◽  
Mössbauer Effect ◽  
Mossbauer Effect

Determination of Type and Degree of Long-Range Order in FeSi Steel by the Mössbauer Effect

1974 ◽  
Vol 24 (2) ◽  
pp. 661-665 ◽  
Author(s):  
I. N. Bogachev ◽  
S. D. Karakishev ◽  
V. S. Litvinov ◽  
V. V. Ovchinnikov
Keyword(s):  
Long Range ◽  
Mössbauer Effect ◽  
Range Order ◽  
Long Range Order ◽  
Mossbauer Effect
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