Proceedings of the Indian Academy of Sciences - Section A

Rastogi, R.

doi: 10.1007/BF03048126pmid: N/A

The occurrence of sporadic E at an equatorial station during magnetically quiet daytime conditions corresponds almost exactly to the time during which the horizontal component of the earth’s magnetic field is above the mean night time level. Any large decrease of H below the night time level is accompanied by the disappearance of equatorial Es−q reflections precisely for the period when the value of H remains below its night time level.

Viswanathan, K.; Revathy, K.

doi: 10.1007/BF03048127pmid: N/A

Lingam, K.; Nair, P.; Venkataraman, Balu

doi: 10.1007/BF03048128pmid: N/A

Electron spin-lattice relaxation times ofp-benzosemiquinone, durosemiquinone and 2, 5 ditertiary butyl-p-benzosemiquinone ions have been measured by the pulsed saturation recovery technique. The relaxation times of the different hyperfine components of a semiquinone ion are the same within the limits of experimental error in disagreement with the findings of Schreurs and Fraenkel. The dependence of T1 on viscosity does not follow the BPP’s theory.

Sharma, S.; Doraiswamy, S.

doi: 10.1007/BF03048129pmid: N/A

The microwave spectra of orthofluoropyridine due to high J transitions has been analysed in order to determine its centrifugal distortion constants. The final values of rotational and centrifugal distortion constants are: $$\begin{gathered} A = 5870 \cdot 856 \pm 0 \cdot 011 MHz \tau _{aaaa} = - 2 \cdot 46_5 \pm 0 \cdot 016 KHz \hfill \\ B = 2699 \cdot 971 \pm 0 \cdot 005 MHz \tau _{bbbb} = - 0 \cdot 42_2 \pm 0 \cdot 003 KHz \hfill \\ C = 1849 \cdot 244 \pm 0 \cdot 004 MHz \tau _{cccc} = - 0 \cdot 0 (fixed) KHz \hfill \\ \tau _{abab} = - 0 \cdot 61_8 \pm 0 \cdot 015 KHz \hfill \\ \end{gathered} $$ Using these constants a number of transitions have been assigned upto J = 60.