Chhonkar, N S

Mookherji, A

English

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Jlette%6 to the ^ d ito tT h e  h o a r d  o f  E d ito r s  w ilt  n o t  h old  i t s e l f  r es p o n s ib le  f o r  o p in io n s  e x p r e s s e d  i n  th e  le tters  p u b lis h e d  i n  th is  se c t io n . T h e  n o te s  c o n ta in in g  r ep o rts  o f  n ew  w o rk  c o m m u n ic a te d  f o r  th is  se c tio n  sh o u ld  n o t  c o n ta in  m a n y  fig u re s  a n d  sh o u ld  n o t  exc eed  5 0 0  w o rd s  i n  len g th . T h e  c o n tr i ­bu tio n s  m u s t  rea ch  the A s s is ta n t  E d ito r  n o t  la ter th a n  the J 5 th  o f  the se co n d  m o n th  p r e c e d in g  that o f  the i s s u e  i n  w h ich  the le tter  i s  to a p p e a r . N o  p r o o f  w ill  be s e n t  to the a u th o rs .11LIGHT ABSORPTION IN PARAMAGNETIC Co++ IONS INSTATE OF SOLUTION \A. MOOKHERJl ANi> N. 8 OHHONKARPllYHJUR LADOKM'OHy, AOKA OoLUWK, AoIIA (h c c e 'iw d . M a y  7,In a rui'cMit paper Oliakmvarly a)i(l Chattcvji (1950) asmiming an approximate tetragonal axis of syinmeLry for the ocialiodron of walci eluster aliont Co++ ion*an(l following the method of Ahragram and Pryee (1951) have developed general exjireRRums for the magnetic Hii.secptibdities along and normal to thi^  axis of Hymrnctry of the Avater elnster about Co^  ' ion in crystal in terms of the tetragonal splitting A, the effective Ijaude-sphtlhig factor and the spin-orbit coupling eoeliieieiit T u  order tii get a fit with the exjierin unit ally observed data of magnetic suseiijitihility nioasnrements bv Bose (1948), they required a small value of A varying Avitii temperatui'o and a value of the coefficient of sjiin-orbit eou))ling which is the same as that foi* the free ion, for the salts studied.An examination of the energy level expressions Owen (1955) shows that if A is small, them the number of alisorption bends of Co' ' ion salts in crystalline state or in state of solution will be limited to three instead of six. Absolution moasuiemeuts of about tlfteen eolialt salts in state of aqueous solution by us, show a single band at about 19,550 eirr ^  and two diseernablc bands at about 20,900 eni~^  and 21.800 v m   ^ which point out clearly ihat. A should bc-^ extreniely small in them, in agreement with the theoretical findings of Chakravarty and Chatterji. The second findings by these authors that the spin-orhit coupling coetfieioiit in erystallinc state is tJie same as the trec^  ion value, will mean that the eovalenti overlap of 3ci-orbitals and the s-and p-orbitals of water ciluster about Co^  ion can be neglected (Owen 1955) ConsecpuMitly the term separation K  for the free ion will be the same as fC \  that for the crystal. From our optical absorption336Letters to ttie Editor 337measurements we have evaluated i?' for about a dozen of Co^ '^  salts in state of aqueous solution. We find that E ' j E  ^  0.95 which is in c.omplete agreement with the findings of Chakravarty and (-hatterji.REFERENCESAbragfam, A. and Pryue, M. H. L., I9ni, P ro v . H o y , A ,  205,135.„ „ „ 1951, Pm. Roy. Soi-. A , 206, 173.Bobo, A., 1948, h i d .  J o u r .  P h ys ., 22, 276.Cliakravarty, A. S. and Clxatterji, R., 1950, In d . J o u r .  P h yn ., 38, 031.Owen, J., 1950, P ro c . R o y , Soc . 227, 183.

Light Absorption in Paramagnetic Co++ Ions in State of Solution

http://arxiv.iacs.res.in:8080/jspui/bitstream/10821/2298/1/Light%20Absorption%20in%20Paramagnetic.pdf

Light Absorption in Paramagnetic Co++ Ions in State of Solution

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