The C (2
Π)→X(2Σ+) transition in thermal emission spectra of the diatomic alkaline earth bromides) transition in thermal emission spectra of the diatomic alkaline earth bromides |
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Authors: | M M Joshi R Gopal |
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Institution: | (1) Physics Department, Allahabad University, 211002 Allahabad |
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Abstract: | The extensive thermal emission spectrum attributed to the diatomic bromides of calcium, strontium and barium has been observed
in the visible region at temperatures about 2200–2400° C, using a vacuum graphite furnace. Many new bands,viz., 141 in CaBr, 53 in SrBr and 68 in BaBr, have been recorded and classified. The vibrational constants agree with those determined
by earlier workers and involved the ground state in each case. The transition C→X apears in each molecule and consists of
two equally intense systems,viz., C1→X and C2→X. The general spectroscopic features of the C→X systems of the bromides of the II A sub group of the periodic table have
been compared. They exhibit a close structural similarity and furnish a good example of homologous spectra. The system C→X
in all these molecules arises from a C2
π−X2
Σ
+ transition where the2
π state appears to be intermediate between Hund’s cases (a) and (b). |
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Keywords: | Thermal emission molecular spectra alkaline earth bromides |
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