By Poenitz, W.P.; Argonne National Lab.; United States. Dept. of Energy. Office of Scientific and Technical Information
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Extra info for Fast neutron capture and activation cross sections of niobium isotopes
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8 is not small which means that the quadrupole X- triplet emission is not expected to be very weak - in comparison with that of the "bright" singlet X- state - and perhaps can be observed experimentally. Note that the "bright" singlet X- state has M, = 0 and can participate in the usual dipole emission characterized by the PL angular dependence h(8) ex (1 + cos 2 8). The singlet PL intensity h(8) does not contain the factor (K oa )2 and has its maximum at 8 = O. In general, dark Xstates that have M, < 0 and exist in higher LLs [27], become optically-active in higher-multipole emission channels: The lowest multiplicity of allowed PL from an X- state with some fixed value of M, < 0 is 21Mz I + 2.
B 55, 2436-2455. 20. Hawrylak, P. and Potemski, M. (1997) Theory of photoluminescence from an interacting twodimensional electron gas in strong magnetic fields, Phys. Rev. B. 56, 12386-12394. 21. Rashba, E.!. D. (2001) Hidden symmetry and magnetospectroscopy of quantum wells near filling factor v = 2, Phys. Rev . B 63, 045305 . 22. Nickel, H. , and Petrou , A. (2002) Interaction of an electron gas with photo-excited electron-hole pairs in modulation-doped GaAs and CdTe quantum wells, Physiea E 12, 499-502.
Magneto-Pl. 4 x 1011 cm- 2) . The straight lines are guides to the eye. 4 x 1011 cm- 2 is indicated. Figure 7(a) shows ODR spectra for sample 4 for several FIR laser photon energies. These data were obtained by tracking the main PL feature with magnetic field. 66 T for this sample. The sharp feature present in all traces is electron cyclotron resonance (e-CR). Note that no feature is observed in any scan at a higher magnetic field than that of e-CR, in agreement with the selection rule [9, 26], prohibiting bound-to-bound IETs of X -.
Fast neutron capture and activation cross sections of niobium isotopes by Poenitz, W.P.; Argonne National Lab.; United States. Dept. of Energy. Office of Scientific and Technical Information
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