• R M Agrawal

      Articles written in Proceedings – Section A

    • The1I6 state of Pr3+ in LaCl3 at 77°K

      R M Agrawal R K Asundi R C Naik D Ramakrishnan Shobha Singh

      More Details Abstract Fulltext PDF

      A single crystal of 5% Pr3+ in LaCl3 was grown by Stockbarger’s method and its absorption spectrum at 77° K. recorded in the region 4200–5400 Å on a grating spectrograph having a dispersion of 5 Å/mm. in the first order. Polarization of the absorption lines has also been obtained. In the group of lines arising from1I63H4 transition, six more lines in addition to the four previously known have been observed. Satisfactory analysis of all these ten lines is given. One additional Stark level in1I6 is established at 21407 cm.−1 withμ=1. For a few lines the polarization results obtained here do not agree with those of previous workers but fit in satisfactorily in the analysis.

    • Ultra-violet absorption spectra and higher excited states of Nd3+ in LaCl3 at 77° K.

      R M Agrawal R K Asundi R C Naik D Ramakrishnan Shobha Singh

      More Details Abstract Fulltext PDF

      The paper deals with an extension towards shorter wavelengths of the absorption spectrum of Nd3+ employing a 5% Nd3+ doped LaCl3 crystal. Five new groups of lines have been recorded and the analysis and interpretation of one of these groups,viz., group O between 3010 and 3023 Å are given. The lines observed in this group are shown to be due to transitions from the ground level (4I9/2) stark components (μ=5/2, 1/2 and 3/2) to the two stark components (μ=3/2, 1/2) of2D3/2 level at about 33200 cm.−1

    • X-Ray K-absorption edges of cobalt in two recently prepared chelates

      R M Agrawal Amar Nath Nigam

      More Details Abstract Fulltext PDF

      K-absorption edges of cobalt in two chelates,viz., Co (II) bis S-ethyl 1-amidino 2-thiourea and Co (III) isonitroso acetylacetonate have been recorded photographically. The results have been discussed in the light of available magnetic measurements and favour a tetragonal structure for the first and an octahedral one for the second chelate.

  •  

© 2021-2022 Indian Academy of Sciences, Bengaluru.