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By Poenitz, W.P.; Argonne National Lab.; United States. Dept. of Energy. Office of Scientific and Technical Information

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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.

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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 -.

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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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