High-resolution La: spectra of indium and tin.The natural linewidths of L a , X-ray emission of metallic In and Sn have been measured in fluorescence by using a high resolution double crystal spectrometer and found to be 2.83 and 2.86 * 0.15 eV, respectively. The diagram L a , lines exhibit high-energy satellites which originate most probably from Coster-Kronig transitions and shakeoff.
We discuss string theories with small numbers of non-compact moduli and describe constructions of string theories whose low-energy limit is described by various pure supergravity theories. We also construct a D = 4, N = 4 compactification of type II string theory with 34 vector fields.
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