Kamalasanan, M N

Nampoori, V P N

Patel, M M

English

IACS Institutional Repository

Indian J. Phys, 51B, 401-403 (1977)Rotational analysis of the B~>X system of indium monochloridc moleculeV. P. N. Namkx)ki, M. N. K amaiasanan a n d  M. M. Patfi. Physics I>epartment, f  aculty o f Science,M. S. IJnivetsuy o f hanHia, BarocIa-^^OOOlEmission spectrum of InCl was photographed in the seventh order of a two nielre plane grating spectrograph al a disper' i^onof 0.5 A/niin 1,0 0,0 and 0,1 hands of -----X system wereresolved and rotational analyses of these bands have been eairied out. Results ot the analysis are as follows:<"c “  2.342 A" r'e - -  2.405 A°B'e — 0.1140 cm ' B "e =  0.1083 cm 'a 'e — 6.4 X 10^  ^ cm“^ <x"c — 5.3 X 10 ' ciii *ly 4.5 X 10 " cm ' i r --  X 10^  ^ cm -'The sipeclruin of indium monochloridc molecule was first reported by Wehrli & Meisher (1934). They observed two band-systems in the region 35(X) 38(X) A and one system in the region 2500- 2800 a ". They were designatedas A------ X^, B “ - X  and C ~ X  respectively. The C—  X system wasanalysed by Froslie & Winans (1947). The ground state of this molecule was studied in microwave aborption by Batiet & Mandcl (1955) and niolscular constants were obtained for the groundstate c>nly. A partial rotational analysisof A-------and B — X  systems has als(^  been carried oul by Youngner &Winanis (1960) In the B ------X system only the 0,0 band was attempted ;The band was not properly resolved h)r rotational analysis and hence the rotational assig)nments were given using the head to origin dii '^ance and the second difference between the rotational lines in the resolved region. Since no other band could be resolved in this system, the rotational assignment could not be checked using any common stales It was therefore decided tophotograph the B------ X  system o-f this molecule at higher dispersion andresolution so ais to carry out a detailed rotational analysis.The spectrum of InQ  molecule was excited in a high frequenc7  discharge working in the frequency range of !0 — 15 MHz having an output of 125 watts. Diatomic In Q  was formed when the discharge wais established in vapours of4 0 2  V. P. N, Nampoori, M. N. Kamalasanan and M. M, Patelpure indium metal in presence of dilorine. The spectrum was photographed in the seventh order of a 2-me(tre plane grating spectrograph at a dispersion of0.5 AVmm. It was not difficult to maintain the deep blue colour of the discharge for fairly long time. About two hours of exposure was sufficient to get a satisfactory spectrogram on Ilford N-40 plates. Measurements were made on an Abbe comparator against iron arc stai’dards.The 0,1 0,0 and 1,0 bands were found suitable for carrying out the rotational analysis. Reprodudtion of the 0,0 band is given in the plate. As is could beseen on the plate, the 0,0 band of B ------ X  systau is well resolved up to theorigin. At low J  values. R  branch lines and the returning R  branch lines merge together but get resolved at high J  values. The structure of 0,1 and 1,0 bands appear similar to the 0,0 band except for the appearance of vibrational isotopic effect. The band heads due to TnG®  ^ were weak due to Its low abundance.J  numbering of the R  branch and a few P branch lines of the 0,0 band was made by observing the origin. The J  numbering of Q branch lines and the returning R branch lines were fixed by the combination difference method The J  assignments and the analysis of 1,0 and 0,1 bands was catried out by comparing the common states involved in these transitions, ct^ , and AC  ^the upper and lower states were calculated graphically and are given in the lable.The cioiuid state of InG  molecule is ’S '  arising from the conlipuration yff2 wTi* xff- The exicited state configuration zer® yo“ wit* xu vit givestwo states It and i^t. The ’ i t —X ’ l  transition correspemds to C------ X  system.^it in In G is nearer lo Hunds case (a) and •'’tco. =^ iti and =*it2 states aresimilar to ’S , ’ it and ’A states. B------X  system corresponds to — X ’Stransition.Table 1. Results of Rotational analysis for B—— X^ system of InG®’(a)Origin B' B"cm“^ ciri“^ 10«D'cni-i10«D"cm“i0,1 28Z58.82 0.1142 0.1080 4.5 3.90,0 28574.01 0.1143 0.1085 4.6 4.01,0 28910.58 0.1137 0.1084 4.4 3.9(b)A G ,, « ccm-1 AB*1ti 0.1140 Z342 338.2 6 4 X 10-40.1083 2.405 315.4 5 3 X 10-4R otation al analysis o f B-^X systemRliERFNCFSE Mcescher & M. Wehrli (1934). Helv. Phy. Acta 7, 928 H. M. Froslie & J. G Winans (1947) Phv. Rev. 72, 481 A. H. Barrett & M. Mandel (I95.S) Pby Rev 99, 666.Philip Yaungner & J. G. Winans (1% 0) i Mdec. Spectrosc. 4, 23.403

Rotational Analysis of the B→X System of Indium Monochloride Molecule

http://arxiv.iacs.res.in:8080/jspui/bitstream/10821/4039/1/Rotational%20analysis%20of%20the%20B%20X%20system_V%20P%20N%20Nampoori.pdf

Rotational Analysis of the B→X System of Indium Monochloride Molecule

Abstract

Similar works

Full text

Available Versions

IACS Institutional Repository