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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 20 (2015) pp 34-38

Obtaining jj Coupled Spectroscopic Terms for Nonequivalent Electrons of (n–1)f2 nd1 Configuration

Parmeshwar L. Meena*,†, Anoop S. Meena, Nitin Kumar, and Kamod S. Meena§

Department of Chemistry, University of Rajasthan, Jaipur, Rajasthan-302004, India,; Department of Chemistry, M. L. S. University, Udaipur, Rajasthan-313001, India; §Department of Chemistry, M. L. V. Govt. College, Bhilwara, Rajasthan-311001, India
Received July 8, 2014. Accepted January 20, 2015.

Published: 6 February 2015

Abstract. To obtain the spectroscopic terms (jj coupled or R-S terms) is a difficult work without a significant knowledge of quantum mechanics for a chemistry student. The accurate description of atomic structure mainly relies on the coupling of the angular momentum in the valence shell electrons of the atom. The coupling of the angular momentum is basically described by two representations: L-S and jj coupling. LS coupling is appropriate for lighter atoms whereas jj coupling is predominant in heavier atoms. The spectroscopic terms are fundamentally important to investigate the atomic structure in atomic physics, quantum chemistry, structural chemistry, and used to describe the electronic transitions that produce the line spectra of the atoms. Six types of jj coupled terms (7/2, 7/2, 5/2), (7/2, 7/2, 3/2), (5/2, 5/2, 5/2), (5/2, 5/2, 3/2), (7/2, 5/2, 5/2) and (7/2, 5/2, 3/2) obtained for nonequivalent electrons of (n-1)f2 nd1 configuration from this method.

Key Words: In the Classroom; physical chemistry; angular momentum; jj coupling; L-S coupling; jj coupled term and spin-orbit interaction.

(*) Corresponding author. (E-mail:

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