Journal of Modern Chemistry & Chemical Technology, Vol 8, No 2 (2017)

Open Access Open Access  Restricted Access Subscription or Fee Access
Font Size:  Small  Medium  Large

LS-Coupled Atomic Term Symbols for nf7 Configuration

P. L. Meena, A.S. Meena, K.S. Meena


In this manuscript, we described a simple method to obtain Russell Saunders atomic terms for nf7 configuration by microstate building and finally the splitting of LS terms, levels and states by different types of interaction represented pictorially. 3432 microstates in nf7 configuration resolve into 119 terms due to electronic interaction that are one (1) octet {8S}, six (6) sextets {6I, 6H, 6G, 6F, 6D, 6P}, forty (40) quartets {4N, 4M, 4L(3-Terms), 4K(3-Terms), 4I(5-Terms), 4H(5-Terms), 4G(7-Terms), 4F(5-Terms), 4D(6-Terms), 4P(2-Terms), 4S(2-Terms),} and seventy two (72) doublets {2Q, 2O, 2N(2-Terms), 2M(4-Terms), 2L(5-Terms), 2K(7-Terms), 2I(9-Terms), 2H(9-Terms), 2G(10-Terms), 2F(10-Terms), 2D(7-Terms), 2P(5-Terms), 2S(2-Terms)}. Ground state term derived for nf7 configuration is Octet S (8S) and ground state is 8S7/2.

Cite this Article. Meena PL, Meena AS, Meena KS. LS-Coupled Atomic Term Symbols for nf7 Configuration. Journal of Modern Chemistry & Chemical Technology. 2017; 8(2): 20–29p.




1.         Gauerke, E.S.J. & Campbell, M.L. (1994). J. Chem. Educ., 71, 457-463.

2.         Wong, E.Y. (1963). Configuration Interaction of the Pr3+ ion.  J. Chemical Phys. 38(4), 976-978.

3.         Lever, A.B.P. (1968). Electronic spectra of some transition metal complexes. J. Chem. Educ., 45, 711-712.

4.         Lande, A. (1921). Vector Model to Describe Atomic Angular Momenta and the Zeeman Effect. Astrophysics Journal, 5, 231.

5.         Russell, H.N. & Saunders, F.A. (1925). New Regularities in the Spectra of the Alkaline Earths. Astrophysical Journal, 61, 38-61.  

6.         Ford, D.I. (1972). Molecular Term Symbols by Group Theory. J. Chem. Educ. 49, 336-340.

7.         Hyde, K.E. (1975). Methods for Obtaining Russell-Saunders Symbols from Electronic Configuration. J. Chem. Educ. 52, 87-89.

8.         McDaniel, D.H. (1977) Spin Factoring as an Aid in the Determination of Spectroscopic Terms. J. Chem. Educ. 54,147-150.

9.         Kiremire, E.M.R. (1987). A Numerical Algorithm Technique for Deriving Russell- Saunders Terms.  J. Chem. Educ. 64, 951-953.

10.     Slater, J.C. (1960). Quantum Theory of Atomic Structure. McGraw-Hill, New York.

11.     Guofan, L. & Ellzey, M.L. (1987). Finding the Terms of Configurations of Equivalent Electrons by Partitioning Total Spins. J. Chem. Educ., 64,771-772.

12.     Chen, J.H.  (1989). Atomic Term Symbols by Group Representation Methods. J. Chem. Educ. 66, 893-898.

13.     Wybourne, B.G. (1966). Group-Theoretical Classification of the Atomic States of gN Configurations, J. Chem. Phys., 45, 1100-1104.

14.     Judd, B.R. (1967). Atomic Shell Theory Recast. Phys. Rev., 162, 28.

15.     Curl, R.F. & Kilpatrik, J.E. (1960). Atomic Term Symbols by Group Theory. Amer. J. Phys., 28, 357-365.

16.     Kiremire, E. M. R. (1990) Partial and Ligand Field Terms, J. Chem. Educ., 67(3), 216-217, 1990.

17.     Olson, J.A. (2011). Atomic Term Symbols via Partitioning Techniques. Int. J. Quantum Chem., 11, 2844-2850.

18.     Meena, P.L., Jain, P.K., Kumar, N. & Meena, K.S. (2011). Study on the Atomic Term Symbols for f3(M+3 free ion) Configuration. Int. J. Chem. Sci., 9(3), 1364-1372.

19.     Meena, P.L., Jain, P.K., Kumar, N. & Meena, K.S. (2011). Study on the Atomic Term Symbols for f4 (M+3 free ion) Configuration. J. Chem. Bio. Phy. Sci., 1(2), 188-203.

20.     Meena, P.L., Meena, A.S. & Meena, K.S. (2015). A Simple Method for Obtaining Russell-Saunders Atomic Terms for Equivalent Electrons of nf6 Configuration. The Journal of Science and Technology, 4(1), 23-27.

21.     Meena, P.L., Kumar, N., Meena, A.S. & Meena, K.S. (2013). Atomic Term Symbols (Terms) for Nonequivalent Electrons of (n-1)f3 nd1 Configuration via Russell- Saunders  Coupling Scheme. International Journal of Chemistry, 34(2), 1236-1242, 2013.

22.     Meena, P.L., Kumar, N., Meena, A.S. & Meena, K.S. (2013). Studies on Atomic Spectroscopic Terms and Term Symbols of Non-equivalent Electrons of d2s1p1 Configuration Using Russell- Saunders Coupling Scheme. Research J. Chem. Sci., 3(4), 19-24, 2013.

23.     Meena, P.L., Kumar, N., Meena, A.S. & Meena, K.S. (2014). Comparative Studies on Russell-Saunders Atomic Term Symbols (Terms) for Equivalent Electrons of nf4 and nf10 Configurations.  Bulgarian Chemical Communications, 46(1), 141-149.

24.   Meena, P.L., Kumar, N., Meena, A.S., Meena, K.S. & Jain, P.K. (2012). Calculation of Atomic Spectroscopic Terms for f2 and f12 Orbital Configuration, Assigning the Term Symbols and a Comparative Study. Bulgarian Chemical Communications, 45(3), 388-393.

Full Text: PDF


  • There are currently no refbacks.