Details
| Translated title of the contribution | Electric quadrupole interactions of20F in MgF2 single crystals |
|---|---|
| Original language | German |
| Pages (from-to) | 47-57 |
| Number of pages | 11 |
| Journal | Zeitschrift für Physik |
| Volume | 269 |
| Issue number | 1 |
| Publication status | Published - Mar 1974 |
| Externally published | Yes |
Abstract
Polarized20F nuclei (T1/2=11s, I=2) have been produced in a tetragonal MgF2 single crystal by capture of polarized neutrons. Nuclear magnetic resonance transitions have been induced and observed via the asymmetric Β decay to20Ne, yielding the quadrupole coupling constant |e2q Q/h|=5.77(2)MHz, the quadrupole moment |Q(20F)|=0.064(12) b and the asymmetry parameter of the electric field gradient η=0.317(2). In order to study possible lattice defects produced by the recoil displacement due to the capture γ-rays NMR signals were registered both at room temperature and at 12 K. Width and depth of the resonance curves indicated that at room temperature nearly all20F ions occupy normal lattice sites with an undisturbed environment. At 12 K, however, where no annealing occurs, this is only true for about half of the20F ions which are stopped directly at defect free sites. The other half of the20F ions at 12 K shows resonance frequencies shifted by defect interactions up to the order of some 100 kHz. Furthermore two simple methods are reported which allow a quick estimate of the strength of the quadrupolar interaction: (1) observation of the Β decay asymmetry versus the magnetic field strength (decoupling curve), (2) broad-band modulation of the induced rf field and observation of the Β asymmetry versus the depth of the modulation.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
- Physics and Astronomy(all)
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In: Zeitschrift für Physik, Vol. 269, No. 1, 03.1974, p. 47-57.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Elektrische Quadrupolwechselwirkungen von20F im MgF2-Einkristall
AU - Stöckmann, H. J.
AU - Ackermann, H.
AU - Dubbers, D.
AU - Grupp, M.
AU - Heitjans, P.
PY - 1974/3
Y1 - 1974/3
N2 - Polarized20F nuclei (T1/2=11s, I=2) have been produced in a tetragonal MgF2 single crystal by capture of polarized neutrons. Nuclear magnetic resonance transitions have been induced and observed via the asymmetric Β decay to20Ne, yielding the quadrupole coupling constant |e2q Q/h|=5.77(2)MHz, the quadrupole moment |Q(20F)|=0.064(12) b and the asymmetry parameter of the electric field gradient η=0.317(2). In order to study possible lattice defects produced by the recoil displacement due to the capture γ-rays NMR signals were registered both at room temperature and at 12 K. Width and depth of the resonance curves indicated that at room temperature nearly all20F ions occupy normal lattice sites with an undisturbed environment. At 12 K, however, where no annealing occurs, this is only true for about half of the20F ions which are stopped directly at defect free sites. The other half of the20F ions at 12 K shows resonance frequencies shifted by defect interactions up to the order of some 100 kHz. Furthermore two simple methods are reported which allow a quick estimate of the strength of the quadrupolar interaction: (1) observation of the Β decay asymmetry versus the magnetic field strength (decoupling curve), (2) broad-band modulation of the induced rf field and observation of the Β asymmetry versus the depth of the modulation.
AB - Polarized20F nuclei (T1/2=11s, I=2) have been produced in a tetragonal MgF2 single crystal by capture of polarized neutrons. Nuclear magnetic resonance transitions have been induced and observed via the asymmetric Β decay to20Ne, yielding the quadrupole coupling constant |e2q Q/h|=5.77(2)MHz, the quadrupole moment |Q(20F)|=0.064(12) b and the asymmetry parameter of the electric field gradient η=0.317(2). In order to study possible lattice defects produced by the recoil displacement due to the capture γ-rays NMR signals were registered both at room temperature and at 12 K. Width and depth of the resonance curves indicated that at room temperature nearly all20F ions occupy normal lattice sites with an undisturbed environment. At 12 K, however, where no annealing occurs, this is only true for about half of the20F ions which are stopped directly at defect free sites. The other half of the20F ions at 12 K shows resonance frequencies shifted by defect interactions up to the order of some 100 kHz. Furthermore two simple methods are reported which allow a quick estimate of the strength of the quadrupolar interaction: (1) observation of the Β decay asymmetry versus the magnetic field strength (decoupling curve), (2) broad-band modulation of the induced rf field and observation of the Β asymmetry versus the depth of the modulation.
UR - http://www.scopus.com/inward/record.url?scp=33646618084&partnerID=8YFLogxK
U2 - 10.1007/BF01668868
DO - 10.1007/BF01668868
M3 - Artikel
AN - SCOPUS:33646618084
VL - 269
SP - 47
EP - 57
JO - Zeitschrift für Physik
JF - Zeitschrift für Physik
SN - 1434-6001
IS - 1
ER -